ANNUAL REPORT 2011-12 - State Load Despatch Centre (SLDC)

STATE LOAD DESPATCH CENTRE 

GUJARAT ENERGY TRANSMISSION CORPORATION LTD. 

VADODARA 

ANNUAL 

REPORT 

2011-12

Annual Report 2011-12 

State Load Despatch Centre 

Gujarat Energy Transmission Corporation Limited 

1


From The Chief Engineer’s Desk 

It gives me immense pleasure to present the Annual Report of SLDC, Gujarat for the financial 

year 2011-12. 

SLDC is mainly carrying out two types of operational activities; one is grid operation to ensure 

safe, reliable and economic despatch of electricity in the State of Gujarat and the other is 

commercial operation for providing Short Term Open Access, accounting quantum of 

scheduled energy, unscheduled energy exchange and reactive energy exchange. 

Grid Operation 

The generation capacity addition of 18.65% (2845 MW) is achieved compared to 12% addition 

during previous year 2010-11. The addition comprises of 1170 MW from Renewable sources, 

1000 MW from Private Sector and 675 MW from Central Sector. 36 Nos. of EHV transmission 

elements were added in Gujarat system during the year 2011-12. A rise of 10.37% in total 

energy catered and a rise of 7.15 % in Maximum demand catered are worth mentioning. The 

energy received from renewable sources is 4175 MUs (5.3% of total energy) while it was 2820 

MUs (3.96% of total energy) in the previous year and the rise of 48% in contribution from 

renewable sources is quite remarkable. These figures indicate that complexity of grid is 

increasing enormously. There are lot of uncertainties prevailing in the grid such as demand 

variation, wide variation in generation from renewable sources etc. During the year, SLDC has 

made numerous efforts to ensure safe, secure, economic and reliable grid operation. In the 

beginning of July-2011, multiple line tripping in Saurashtra area owing to bad weather and in 

Dec-11, the whole UTPS generation loss due to inadvertent switching operation in switchyard 

caused major grid disturbances in Gujarat system. SLDC’s efforts in handling these situations 

were indeed noteworthy for quick restoration of the system in both the cases. SLDC is 

managing such complexities by using advanced Power System Tools, effective planning for 

outages of transmission elements and generating units, ensuring real time data for entire grid 

observation etc. Variation of 800-1000 MW generation in a day from renewable sources is 

quite common. Such variation in the system is persistent and is handled by continuously 

analysing weather related information, generation regulation, optimizing the operation of 

lines, ICTs and shunt elements like capacitors and reactors. 

Commercial Operation 

By mandate, SLDC is the nodal agency for STOA in the State. SLDC has to carry out energy 

accounting for computation of capacity charges, scheduling charges and transmission losses. 

Also, SLDC has to maintain and manage UI Account, Reactive Energy Account and Congestion 

Charges Account and RTDA Account. It is our pride that Gujarat State has implemented Intra- 

State ABT Mechanism complete in all respects since April 2010 for better grid discipline and 

accounting. With the capacity addition taking place at a faster pace, the substantial increase 

in interconnections between different subsystems and the inevitable need to provide efficient 

and effective STOA platform, the data processing and publishing work at SLDC has 



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tremendously increased. SLDC is handling 1123 Nos. of SEM data weekly as on Mar-12 

compared to 930 Nos. in March-11. At present, SLDC has 67 pool members in UI accounts 

compared to 60 during previous year and the number is on the rise. The Nos. of STOA 

applications processed during the year was 1187 while it was 599 in the previous year. During 

the year 2011-12, an amount of Rs. 1328.71 Crore was handled in UI pool accounts whereas 

in the year 2010-11, it was Rs. 1102.07 Crore. 

Initiatives for Improvement 

Incredible improvement has been observed in performance of operational activities efficiently 

and effectively. The line outage management module has been developed in ERP software of 

GETCO to enable the end user to avail planned and real time emergency outages of 

transmission elements and to access the status of outage request thereby saving a lot of time 

in communication. For secure and reliable grid operation, coding system for line / equipment 

operation is introduced and it is very effective in avoiding any sort of mal-operation. The web 

based scheduling software is developed for quick response to acknowledge the acceptance of 

declared capability of generators and subsequent revisions from them. For creation of 

translucent environment, SLDC website is made user friendly and very much informative. All 

operational and planning data are now easily accessible to all users. 

SLDC believes in knowledge sharing and skill enhancement of each of its working associates. 

Almost in all capacity building workshops and training programs, SLDC officials are delegated. 

Also, in-house discussion sessions are regularly arranged so that each individual’s skill and 

area of interest is candidly recognized. As a result of this, SLDC Gujarat is proud to have 

maximum (33 Nos.) certified system operators in the country, who have been awarded basic 

level system operation certificates by NPTI, Bangalore. 

Focus Areas for 2012-2013 

A number of opportunities and challenges exist for Gujarat Grid. Key amongst the challenges 

are the increasing levels of complexity in the operation of the power system coupled with a 

dramatically changing generation of renewable sources, portfolio of high capacity generator 

units, wide variation in demand, planning of outages for generating units and transmission 

elements, real time incorporation of voluminous revisions from generators and DISCOMs, 

data acquisition on faster rate, assessment of transfer capabilities, flexibility to implement 

frequent changes in Regulations, issuance of bills, invoices and statements to all users timely 

and accurately etc. SLDC has set road map to meet these challenges. 

SLDC is planning to procure ABT software with Automatic Meter Reading (AMR) solutions. 

This software would be capable of handling thousands of SEM parameters and producing the 

reports in the quickest possible time. 

SLDC is likely to receive latest version of PSS/E system study software tool shortly from PGCIL. 

It would certainly assist in managing the system safely, securely and reliably and also, in 

making future planning of grid to a great extent. 



3


SLDC Gujarat is planning to move forward to new WAMS technology using Digital 

Synchrophasor. This technology would improve operators’ visibility of the grid in a broader 

perspective and strengthen reliability. It will provide a dynamic status of the system at any 

given moment. This facilitates early detection of any forthcoming harmful event to the grid 

and responds to it, thereby, enhancing reliability and enabling the optimization of the 

resources safely. The synchrophasor technology provides complex quantity of data at a much 

faster rate, upto 10/25/50 samples per second time: stamped and synchronised through GPS. 

In conclusion, it provides MRI view of the system instead of the X-ray view of the present 

system. 

I, on behalf of SLDC staff, convey my earnest thanks to Shri S. K. Negi (Hon’ble MD, 

GETCO) for providing an excellent guidance and invaluable support and being a 

“Mentor” all the time taking profound interest and boosting up morale of each 

individual working at SLDC. All my efforts in preparation of this Annual Report 

would rather go in vain if I fail to thank GERC, WRPC, WRLDC (POSOCO) and 

beneficiaries and all others related to grid operation for rendering their continuous 

support, active involvement and kind cooperation. 

Chief Engineer 




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Table of Contents 

1. INTRODUCTION ........................................................................................................................... 7 

1.1 Formation ......................................................................................................................................... 7 

1.2 Vision ................................................................................................................................................ 7 

1.3 Mission ............................................................................................................................................. 7 

1.4 Core Values ...................................................................................................................................... 7 

1.5 Functions .......................................................................................................................................... 7 

2. SALIENT FEATURES OF THE GUJARAT GRID ................................................................................... 9 

2.1 Installed Capacity ............................................................................................................................. 9 

2.1.1 Sector wise ................................................................................................................................ 9 

2.1.2 Fuel wise ................................................................................................................................. 10 

2.2 Transmission Network as on 31.03.12 ........................................................................................... 10 

2.3 Distribution Companies in Gujarat................................................................................................. 11 

3. DEMAND FACTS ........................................................................................................................ 12 

3.1 Month wise Unrestricted Demand and Maximum Demand Catered in MW ................................ 12 

3.2 Demand Variation on Festival Days ............................................................................................... 14 

3.2.1 Demand Variation on Diwali Festival ...................................................................................... 14 

3.2.2 Demand Variation on Uttarayan Festival & on Republic Day ................................................. 15 

3.2.3 Demand Variation on Holi - Dhuleti Festival ........................................................................... 16 

4. ENERGY GENERATION FACTS ..................................................................................................... 17 

4.1 Sector wise Energy Generation (in MUs) ....................................................................................... 17 

4.2 Month wise Energy Generation ..................................................................................................... 17 

4.3 Monthly Sector wise Energy Generation ....................................................................................... 18 

4.4 State Generating Station wise Energy Generation for Year 2011-12. ........................................... 18 

4.4.1 Thermal Units .......................................................................................................................... 18 

4.4.2 Hydro Units ............................................................................................................................. 19 

4.4.2 Gas Units ................................................................................................................................. 20 

5. RENEWABLE ENERGY GENERATION ABSORPTION ....................................................................... 21 

5.1 Wind Energy Generation Facts ...................................................................................................... 21 

5.1.1 Monthly Wind Energy Generation in MUs .............................................................................. 21 

5.1.2 Month wise Maximum Wind Energy Generation in MWH ..................................................... 21 

5.1.3 Maximum Wind Energy Variation in a day during the month ................................................ 22 

5.1.4 Hourly Wind Energy Injection Trend during the year 2011-12. .............................................. 22 

5.1.5 Wind Farm Installation Vs Maximum Hourly Energy Received .............................................. 23 

5.1.6 Maximum Variation in Wind Energy Generation in MUs ....................................................... 23 

5.2 Solar Energy Generation Facts ....................................................................................................... 24 



5


5.2.1 Month wise Solar Energy Installation Vs Maximum Solar Energy Injection ........................... 24 

5.2.2 Monthly Solar Energy Received in MUs .................................................................................. 24 

5.2.3 Hourly Solar Energy Generation Pattern of Mar’12 last week ............................................... 25 

5.2.4 Hourly Solar Energy Generation Pattern ................................................................................ 25 

5.3 Monthly Energy Received from Biomass ....................................................................................... 25 

6. DISCOM-WISE DEMAND FACTS .................................................................................................. 26 

6.1 DISCOM wise Energy Catered ........................................................................................................ 26 

6.1.1 DISCOM wise Energy Catered in MUs for last two Financial Years......................................... 26 

6.2 Category wise Energy Supplied in MUs ...................................................................................... 27 

6.3 Category wise Energy Supplied by DISCOMs in MUs ................................................................. 27 

6.4 DISCOM wise Category wise energy supplied in MUs ............................................................... 28 

7. VOLTAGE PROFILE STATISTICS AT IMPORTANT NODES ............................................................... 29 

8. FREQUENCY PROFILE STATISTICS ............................................................................................... 32 

8.1 Frequency Trend for Last Two Financial Years............................................................................... 32 

8.2 Monthly Frequency Trend Comparisons........................................................................................ 32 

9. GENERATION CAPACITY ADDITION ............................................................................................ 33 

9.1 Generation Capacity Addition during FY 2011-12 ......................................................................... 33 

10. GRID EXPANSION .................................................................................................................... 34 

10.1 EHV lines added in Gujarat Grid in year 2011-12 ........................................................................ 34 

11. MAJOR INCIDENTS ................................................................................................................... 35 

12. ENERGY ACCOUNTING & SETTLEMENT AND STOA DETAILS ....................................................... 36 

12.1 ABT Meters Registered for Data Processing at SLDC ................................................................... 36 

12.2 Nos. of UI Pool Members in UI Pool Account of SLDC ................................................................. 36 

12.3 Users Registered under REC Mechanisms ................................................................................... 36 

12.4 Short Term Open Access Applications Processed ........................................................................ 36 

13. THREE PHASE POWER SUPPLY TO AGRICULTURE SECTOR ......................................................... 37 

14. NETWORK LOSSES ................................................................................................................... 37 

15. SCADA & IT UPDATES .............................................................................................................. 38 

15.1 Data Acquisition Updates............................................................................................................. 38 

15.2 IT Updates .................................................................................................................................... 38 

16. FINANCIAL FACTS & FIGURES ................................................................................................... 39 

16.1 Aggregate Revenue Requirement for the FY 2011-12 ................................................................. 39 

16.2 Major Figures for the FY 2011-12 ................................................................................................ 40 

16.3 CAPEX Plan of SLDC ...................................................................................................................... 41 

17. FOCUS AREAS .......................................................................................................................... 42 



6


1. INTRODUCTION 

1.1 Formation 

As per Energy & Petrochemical Department, Government of Gujarat, Order No. GHU -04-32GEB- 

1104-2946-K of 29 th May 2004, established the load despatch centre, Jambuva as State Load 

Despatch Centre, for purposes of exercising the power and discharging functions under section 

31 of IEA-2003. 

1.2 Vision 

“Propelling people and industrial growth of State by providing quality service.” 

1.3 Mission 

“To achieve global standards in reliable and quality grid services.” 

1.4 Core Values 

a. Customer Satisfaction 

b. Participative Work Culture 

c. Pride of Belongingness 

d. Excellence 

e. Being Ethically and Socially Responsive 

1.5 Functions 

In accordance with section 32 of Electricity Act, 2003, the State Load Despatch Centre (SLDC) 

has to carry out following functions: 

a. SLDC has to ensure integrated operation of the power system in a State. 

b. SLDC is responsible for optimum scheduling and despatch of electricity within a State. 

c. Monitor grid operations; 

d. keep accounts of the quantity of electricity transmitted through the State grid; 

e. Exercise supervision and control over the intra-State transmission system; 

f. SLDC is responsible for carrying out real time operations for grid control and despatch 

of electricity within the State through secure and economic operation of the State grid 

in accordance with the Grid Standards and the State Grid Code. 

g. SLDC in a State may give such directions and exercise such supervision and control as 

may be required for ensuring the integrated grid operations and for achieving the 

maximum economy and efficiency in the operation of power system in that State. 



7


h. Every licensee, generating company, generating station, sub-station and any other 

person connected with the operation of the power system shall comply with the 

directions issued by the SLDC. 

i. The SLDC shall comply with the directions of the Regional Load Despatch Centre. 

j. In case of inter-state bilateral and collective short-term open access transactions 

having a state utility or an intra-state entity as a buyer or a seller, SLDC shall accord 

concurrence or no objection or a prior standing clearance. 

k. The following are contemplated as exclusive functions of SLDC. 

a. System operation and control covering contingency analysis and operational 

planning on real time basis; 

b. Scheduling / re-scheduling of generation; 

c. System restoration following grid disturbances; 

d. Metering and data collection; 

e. Compiling and furnishing data pertaining to system operation; 

f. Operation of state UI pool account, state reactive energy account. 



8


2. SALIENT FEATURES OF THE GUJARAT GRID 

2.1 Installed Capacity 

2.1.1 Sector wise 

Installed 

Capacity (MW) 

State 

Sector 

Private 

Sector 

Central 

Sector 

Wind 

Farm 

Solar Biomass Total 

Growth 

% 

As on 31-03-10 5215.57 3568.50 3043.45 1782.00 0.00 0.00 13609.52 - 

As on 31-03-11 4995.57 5324.50 2820.00 2094.31 5.00 10.00 15249.38 12.05 

As on 31-03-12 4995.57 6324.50 3494.25 2694.00 554.40 31.20 18093.92 18.65 

Installed Capacity Growth (in MW) 

State Sector Private Sector Central Sector Wind Farm Solar Biomass 

As on 31-03-10 As on 31-03-11 As on 31-03-12 



9


2.1.2 Fuel wise 

Period Thermal Gas Hydro Nuclear Solar 

Wind 

Farm 

Biomass 

Total 

As on 31-03-10 6655.20 3821.07 779.00 572.25 - 1782.00 - 13609.52 

As on 31-03-11 7975.00 3821.07 785.00 559.00 5.00 2094.31 10.00 15249.38 

As on 31-03-12 9649.25 3821.07 785.00 559.00 554.40 2694.00 31.20 18093.92 

Fuel-Wise Installed Capacity Growth (in MW) 

Thermal Gas Hydro Nuclear Solar Wind Farm Biomass 

As on 31-03-10 As on 31-03-11 As on 31-03-12 

2.2 Transmission Network as on 31.03.12 

Sr. No. 

Voltage 

Class 

No. of 

Substations 

As on 31.03.2007 As on 31.03.2012 

Transmission 

Lines in Ckt. Km 

No. of 

Substations 

Transmission 

Lines in Ckt. Km 

1 400 KV 9 1847 11 3188.67 

2 220 KV 65 11895 79 14852.38 

3 132 KV 48 4552 49 4807.53 

4 66/33 KV 756 16876 1131 22107.91 

Total 878 35170 1270 44956.49 



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2.3 Distribution Companies in Gujarat 

Sr. No. 

Name of the 

Company 

Contracted Capacity (in 

MW) as on 31.03.12 

1 PGVCL 5303 

2 UGVCL 4140 

3 DGVCL 4383 

4 MGVCL 2134 

5 TP AE Co. 

1647 

6 TP SE Co. 

7 KPT 7 

Total 17614 

Contracted Capacity in MW as on 31.03.12 

9% 

0% 

12% 

25% 

30% 

PGVCL 

UGVCL 

DGVCL 

MGVCL 

TPAEC & TPSEC. 

KPT 

24% 



11

Apr 

Apr 

May 

May 

June 

June 

July 

July 

Aug 

Aug 

Sept 

Sept 

Oct 

Oct 

Nov 

Nov 

Dec 

Dec 

Jan 

Jan 

Feb 

Feb 

Mar 

Mar 


3. DEMAND FACTS 

3.1 Month wise Unrestricted Demand and Maximum Demand Catered in MW 

12000 

11000 

10000 

9000 

Monthwise Maximum Demand Catered in MW 

11209 

10461 

9883 

8000 

2009-10 2010-11 2011-12 


11000 

Maximum unrestricted demand in MW 

11401 

10000 

9000 

8000 


Contribution of Renewable Energy in Maximum Demand Catered 

1,102 1,166 

2010-11 2011-12 

1,257 

566 

438 

729 

397 

527 

316 

102 101 

172 

105 113 

240182 

299 

172 

104 

21 

136 

600 631 

375 

Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar 



12

Hrs. 

MW 

Apr-11 

May-11 

Jun-11 

Jul-11 

Aug-11 

Sep-11 

Oct-11 

Nov-11 

Dec-11 

Jan-12 

Feb-12 

Mar-12 


Month wise Maximum catered, Minimum catered & Maximum difference 

in a day handled by SLDC for FY 2011-12. 


10000 

8000 

6000 

10326 10459 

7908 

8315 

10776 10724 

7360 

6013 

9090 

10223 

5371 5623 


6771 

10771 10563 

8597 

7549 

10164 10142 


7586 

10983 

6389 

4000 

2000 

1403 1666 

2242 

3499 

1969 2034 

1690 1579 

2326 2604 

2205 2416 

0 

Max catered in MW Min catered in MW Maximum difference handled in a day in MW 

24.00 

Monthly Maximum Catered timings 

20.00 

16.00 

12.00 

8.00 


2010-11 2011-12 



13

MWH 


3.2 Demand Variation on Festival Days 

3.2.1 Demand Variation on Diwali Festival 

Date 24-Oct-11 25-Oct-11 

26-OCT-11 

(DIWALI) 

27-Oct-11 

(NEW YEAR) 

28-Oct-11 

(BIJ) 

29-Oct-11 30-Oct-11 31-Oct-11 

Total MWH 

Catered 

Maximum 

Demand Catered 

Minimum 


236257 225493 198383 180152 189339 199321 204187 215415 

10591 9970 9091 8133 8404 8647 9039 9675 

9279 8965 7401 6771 7517 7931 8098 8515 

11000 

LOAD PATTERN DURING DIWALI FESTIVAL 

10000 

9000 

8000 

7000 

6000 

1 3 5 7 9 11 13 15 17 19 21 23 

24-Oct 25-Oct 26-Oct 27-Oct 28-Oct 29-Oct 30-Oct 31-Oct 



14

MWH 

MWH 


3.2.2 Demand Variation on Uttarayan Festival & on Republic Day 

Date 

13-Jan-12 


Uttarayan 

15-Jan-12 16-Jan-12 25-Jan-12 


Republic Day 


Total MUs 

Catered 

Maximum 


Minimum 


212 172 184 206 215 200 213 

9975 8211 8663 9704 9926 9046 9832 

7608 6223 6125 7100 7869 7621 7478 

LOAD PATTERN DURING UTTARAYAN FESTIVAL 

11000 

10000 

9000 

8000 

7000 

6000 

5000 

1 3 5 7 9 11 13 15 17 19 21 23 

13-Jan 14-Jan 15-Jan 16-Jan 

LOAD PATTERN DURING REPUBLIC DAY FESTIVAL 

11000 

10000 

9000 

8000 

7000 

6000 

1 3 5 7 9 11 13 15 17 19 21 23 

25-Jan 26-Jan 27-Jan 



15

MWH 


3.2.3 Demand Variation on Holi - Dhuleti Festival 

Date 

6-Mar-12 


(Holi) 


(Dhuleti) 



Total MWH Catered 223744 213081 172614 194269 208087 

Maximum Demand Catered 9974 9487 8114 9010 9355 

Minimum Demand Catered 8681 8274 6389 6594 7683 

11000 

LOAD PATTERN DURING HOLI-DHULETI FESTIVAL 

10000 

9000 

8000 

7000 

6000 

1 3 5 7 9 11 13 15 17 19 21 23 

06-Mar 07-Mar 08-Mar 09-Mar 10-Mar 



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4. ENERGY GENERATION FACTS 

4.1 Sector wise Energy Generation (in MUs) 

Year 

GSECL 

Private 

Sector 

Central 

Sector 

Wind 

Energy 

Solar Biomass Total MUs 

2009-10 28507 25314 13334 2729 0 0 69884 

2010-11 27762 32965 7709 2815 3 3 71256 

2011-12 28638 37116 8723 3961 167 47 78651 

Sector-wise Generation in MUs 


37116 

32965 

28507 28638 

27762 

25314 

13334 

8723 

7709 

2729 2815 3961 

0 3 167 0 3 47 

GSECL Private Sector Central Sector Wind Energy Solar Biomass 

4.2 Month wise Energy Generation 

Month wise Energy Catered in Mus 


7009 

7229 7039 

6763 

6858 

6899 

7001 

6985 

6505 

6270 

6672 

6503 

6005 

6108 

6336 

6276 

5859 

6184 

6279 

6231 

5923 

5855 5907 

5531 

5949 5994 

5816 5820 

5634 

5542 

5159 

5311 

5327 

5175 

5049 

4787 




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4.3 Monthly Sector wise Energy Generation 

3500 

3000 

2500 

Monthly Sector wise energy supplied in MUs during 2011-12 

3327 

2855 

2000 

1500 

1000 

500 

626 

1301 

0 

Apr-11 May-11 Jun-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-11 Jan-12 Feb-12 Mar-12 

GSECL Private Central sector WEG Solar Biomass 

4.4 State Generating Station wise Energy Generation for Year 2011-12. 

4.4.1 Thermal Units 

Thermal 

Unit 

Installed 

Capacity (MW) 

Derated 

Capacity (MW) 

Generation 

(in MUs) 

GANDHINAGAR 

WANAKBORI 

UKAI 

SIKKA 

PANANDHRO 

GTPS 1 120 120 411.99 

GTPS 2 120 120 553.43 

GTPS 3 210 210 1511.24 

GTPS 4 210 210 1399.29 

GTPS 5 210 210 1611.32 

WTPS 1 210 210 1080.78 

WTPS 2 210 210 1533.11 

WTPS 3 210 210 1494.30 

WTPS 4 210 210 1445.64 

WTPS 5 210 210 1560.30 

WTPS 6 210 210 1603.57 

WTPS 7 210 210 1562.72 

UTPS 1 120 120 626.37 

UTPS 2 120 120 739.07 

UTPS 3 200 200 1438.39 

UTPS 4 200 200 1414.08 

UTPS 5 210 210 1398.92 

STPS 1 120 120 434.25 

STPS 2 120 120 542.64 

KLTPS 1 70 70 374.99 

KLTPS 2 70 70 452.46 

KLTPS 3 75 75 337.26 

KLTPS 4 75 75 358.42 



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Thermal 

Unit 

Installed 

Capacity (MW) 

Derated 

Capacity (MW) 

Generation 

(in MUs) 

AECO C 60 60 402.59 

TORRENT POWER 

AECO D 120 120 897.39 

AECO E 110 110 818.87 

AECO F 110 110 840.70 

SLPP 1 125 125 660.37 

SURAT LIGNITE 




AKRIMOTA 

ALPP 1 125 125 434.42 

ALPP 2 125 125 436.50 

APL-1 330 250 1894.35 

APL-2 330 250 2123.63 

APL-3 330 250 2290.14 

APL-4 330 250 2406.70 

APL 

APL-5 660 0 3247.22 

APL-6 660 449.11 

APL-7 660 1634.94 

APL-8 316.75 

APL-9 30.08 

ESSAR VADINAR EPGL-1 111.33 

Total Thermal 8170 5870 45147.96 

4.4.2 Hydro Units 

Hydro 

Unit 

Installed 

Capacity (MW) 

Derated 

Capacity (MW) 

Generation 

(in MUs) 

UKAI 

UHPS 1 75 75 149.75 

UHPS 2 75 75 93.65 

UHPS 3 75 75 115.18 

UHPS 4 75 75 98.96 

UKAI LBCH 

ULBC 1 2.5 2.5 15.87 

ULBC 2 2.5 2.5 8.30 

KHPS 1 60 60 45.59 

KADANA 

KHPS 2 60 60 58.88 

KHPS 3 60 60 94.74 

KHPS 4 60 60 72.84 

PANAM PANAM 2 2 2.42 

MADHUBAN DAM 

MADHUBAN DAM-1 1.5 1.5 9.93 

MADHUBAN DAM-2 1.5 1.5 9.64 

PRIVATE Karjan Dam 3 3 19.71 

Total Hydro 553 553 795.45 



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4.4.2 Gas Units 

Gas 

Unit 

Installed 

Capacity (MW) 

Derated 

Capacity (MW) 

Generation 

(in MUs) 

DHUVARAN 

UTRAN 

GIPCL-I 

GIPCL-II 

TORRENT POWER 

ESSAR POWER 

CLPIPL 

GSEG 

GSEG STAGE 2 

SUGEN 

DTPS - GT1 68 68 359.83 

DTPS -STG1 39 39 209.35 

DTPS-GT2 72 72 284.18 

DTPS-STG2 40 40 160.80 

UGPP GT1 33 30 83.63 

UGPP GT2 33 30 96.45 

UGPP GT3 33 30 171.18 

UGPP ST1 46 45 266.59 

UGPP GT-4 229 228.57 1439.98 

UGPP ST2 146 146 930.28 

GIPCL GT1 32 32 167.41 

GIPCL GT2 32 32 211.73 

GIPCL GT3 32 32 174.65 

GIPCL ST1 49 49 266.66 

GIPCL GT4 111 111 433.28 

GIPCL ST2 54 54 231.36 

AECO GT1 32.5 32.5 197.10 

AECO GT2 32.5 32.5 117.96 

AECO STG 35 35 167.38 

ESSAR GT1 110 110 399.80 

ESSAR GT2 110 110 459.12 

ESSAR GT3 110 110 395.22 

ESSAR SGT 185 185 713.34 

CLPIPL GT1 138 138 546.45 

CLPIPL GT2 138 138 745.69 

CLPIPL GT3 138 138 674.40 

CLPIPL STG 241 241 1121.70 

GSEG 1 52 52 290.01 

GSEG 2 52 52 271.98 

GSEG ST 52 52 501.85 

GSEG 20 103.78 

STG 20 47.24 

SUGEN GT1 383 382.5 2354.68 

SUGEN GT2 383 382.5 2589.24 

SUGEN GT3 383 382.5 3542.84 

Total Gas 3623 3397.07 20727.12 



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5. RENEWABLE ENERGY GENERATION ABSORPTION 

5.1 Wind Energy Generation Facts 

5.1.1 Monthly Wind Energy Generation in MUs 

5.1.2 Month wise Maximum Wind Energy Generation in MWH 



21

0 to 1 

1 to 2 

2 to 3 

3 to 4 

4 to 5 

5 to 6 

6 to 7 

7 to 8 

8 to 9 

9 to 10 

10 to 11 

11 to 12 

12 to 13 

13 to 14 

14 to 15 

15 to 16 

16 to 17 

17 to 18 

18 to 19 

19 to 20 

20 to 21 

21 to 22 

22 to 23 

23 to 24 


5.1.3 Maximum Wind Energy Variation in a day during the month 

5.1.4 Hourly Wind Energy Injection Trend during the year 2011-12. 

Observation of Hourly Wind Generation Trend 

500 MW 

151 149 149 143 140 123 120 116 114 88 78 83 92 94 106 124 139 144 142 144 156 158 156 154 

125 131 136 132 137 144 137 117 87 

82 86 91 

97 112 116 

127 114 116 131 140 133 135 139 131 

90 86 81 91 89 99 109 133 165 196 202 192 177 160 144 115 113 106 93 82 77 73 71 81 

From the above, it is observed that the wind energy injection between 08:00 Hrs. to 13:00 

Hrs. during the year is quite less. 



22


5.1.5 Wind Farm Installation Vs Maximum Hourly Energy Received 

Month wise wind farm sources installation and maximum hourly energy received from the sources 

Installed Capacity Vs Maximum Wind Injection during the Month 

5.1.6 Maximum Variation in Wind Energy Generation in MUs 

Maximum variation in wind energy generation in MUs on two consecutive days 



23

Apr-11 

Apr-11 

May-11 

May-11 

Jun-11 

Jun-11 

Jul-11 

Jul-11 

Aug-11 

Aug-11 

Sep-11 

Sep-11 

Oct-11 

Oct-11 

Nov-11 

Nov-11 

Dec-11 

Dec-11 








5.2 Solar Energy Generation Facts 

5.2.1 Month wise Solar Energy Installation Vs Maximum Solar Energy Injection 

Month wise solar energy installation in (MW) and Maximum Solar energy injection integrated in the 

Gujarat grid: 

495 

554 

374 

175 

266 

177 

240 

5 5 5 4 10 7 10 7 10 7 10 8 

70 

40 38 53 

91 

Month wise Solar Installed Capacity in MW 

Maximum Solar injection in MW 

5.2.2 Monthly Solar Energy Received in MUs 

70 

40 

1 1 1 1 1 1 

4 4 

14 

24 



24

MW 

Apr-11 

May-11 

Jun-11 

Jul-11 

Aug-11 

Sep-11 

Oct-11 

Nov-11 

Dec-11 





5.2.3 Hourly Solar Energy Generation Pattern of Mar’12 last week 

400 

Hourly Solar Energy Generation Pattern of Mar'12 Last weak. 

300 

200 

100 

0 

01.00 

Hrs. 

03.00 

Hrs. 

05.00 

Hrs. 

07.00 

Hrs. 

09.00 

Hrs. 

11.00 

Hrs. 

13.00 

Hrs. 

15.00 

Hrs. 

17.00 

Hrs. 

19.00 

Hrs. 

21.00 

Hrs. 

23.00 

Hrs. 

5.2.4 Hourly Solar Energy Generation Pattern 

400 

Solar Energy Pattern for the day of Maximum Energy Generation 

(24-Mar-12) -2.65 MUs 

300 

200 

100 

0 

01.00 

Hrs. 

03.00 

Hrs. 

05.00 

Hrs. 

07.00 

Hrs. 

09.00 

Hrs. 

11.00 

Hrs. 

13.00 

Hrs. 

15.00 

Hrs. 

17.00 

Hrs. 

19.00 

Hrs. 

21.00 

Hrs. 

23.00 

Hrs. 

5.3 Monthly Energy Received from Biomass 

7 

Biomass Generation in MUs 

3 

4 

3 

2 

1 

5 

6 

5 

4 

1 

5 



25


6. DISCOM-WISE DEMAND FACTS 

6.1 DISCOM wise Energy Catered 

6.1.1 DISCOM wise Energy Catered in MUs for last two Financial Years 

DISCOM wise energy catered in MUs for last two Financial Years 

19379 

21665 

14887 

16295 

8563 9149 

11417 


3276 3278 

6224 6418 

10 - 11 11 - 12 10 - 11 11 - 12 10 - 11 11 - 12 10 - 11 11 - 12 10 - 11 11 - 12 10 - 11 11 - 12 

PGVCL UGVCL MGVCL DGVCL SE Co AE Co 

DISCOM wise Energy Supplied during FY 2011-12 

DGVCL 


22% 

PGVCL 

21665 

36% 

MGVCL 

9149 

15% 

UGVCL 

16295 

27% 



26


6.2 Category wise Energy Supplied in MUs 

Categary wise Energy supplied in MUs 

JGY URB/TWN AGR IND 

18981 

17491 

18686 

15931 

21114 

18114 

9844 

10831 11236 

8064 8791 9508 


6.3 Category wise Energy Supplied by DISCOMs in MUs 

Category Wise Energy Supplied in MUS during FY 2011-12 

IND 

21114 

35% 

JGY 

9508 

16% 

URB/TWN 


19% 

AGR 

18114 

30% 



27


6.4 DISCOM wise Category wise energy supplied in MUs 



28


7. VOLTAGE PROFILE STATISTICS AT IMPORTANT NODES 

Substation 

Month 

No. of days when bus voltage 

remained 

More than 

420 KV 

Less than 

380 KV 

Maximum 

KV 

Minimum 

KV 

Amreli 

Apr-11 0 0 418 392 

May-11 0 0 418 397 

Jun-11 0 0 416 392 

Jul-11 0 2 417 358 

Aug-11 0 0 418 381 

Sep-11 0 0 416 381 

Oct-11 0 13 411 368 

Nov-11 0 8 413 365 

Dec-11 0 0 417 386 

Jan-12 2 0 422 394 

Feb-12 2 0 421 394 

Mar-12 1 0 421 397 

JETPUR 

Apr-11 18 0 433 402 

May-11 28 0 429 405 

Jun-11 23 0 429 395 

Jul-11 25 0 430 381 

Aug-11 26 0 431 405 

Sep-11 23 0 430 394 

Oct-11 0 5 420 376 

Nov-11 0 3 420 373 

Dec-11 1 0 421 386 




HADALA 

Apr-11 29 0 430 406 

May-11 31 0 427 408 

Jun-11 26 0 428 404 

Jul-11 28 1 431 372 

Aug-11 31 0 431 408 

Sep-11 24 0 429 396 

Oct-11 17 0 426 392 

Nov-11 28 0 426 393 

Dec-11 31 0 427 402 






29


Substation 

Month 


remained 

More than 

420 KV 

Less than 

380 KV 

Maximum 

KV 

Minimum 

KV 

CHORANIA 

Apr-11 13 0 428 402 

May-11 2 0 423 398 

Jun-11 0 0 416 394 

Jul-11 0 0 419 382 

Aug-11 0 0 419 401 

Sep-11 0 0 416 398 

Oct-11 0 0 416 389 

Nov-11 2 0 425 387 

Dec-11 0 0 420 394 




SOJA 

Apr-11 1 0 421 403 

May-11 0 0 418 400 

Jun-11 0 0 417 397 

Jul-11 0 0 417 389 

Aug-11 0 0 419 400 

Sep-11 0 0 420 402 

Oct-11 0 0 418 399 

Nov-11 2 0 421 396 

Dec-11 0 0 420 400 




KANSARI 

Apr-11 0 0 420 395 

May-11 0 0 415 388 

Jun-11 0 0 414 389 

Jul-11 2 1 423 372 

Aug-11 4 0 423 392 

Sep-11 8 0 424 395 

Oct-11 0 0 417 386 

Nov-11 1 0 422 392 

Dec-11 1 0 421 395 






30


Substation 

Month 


remained 

More than 

420 KV 

Less than 

380 KV 

Maximum 

KV 

Minimum 

KV 

VADAVI 

Apr-11 26 0 426 406 

May-11 22 0 425 402 

Jun-11 11 0 425 402 

Jul-11 8 0 424 395 

Aug-11 7 0 423 400 

Sep-11 11 0 426 401 

Oct-11 19 0 426 404 

Nov-11 30 0 428 401 

Dec-11 31 0 429 408 




ASOJ 

Apr-11 12 0 424 404 

May-11 8 0 427 404 

Jun-11 0 0 420 402 

Jul-11 0 0 420 397 

Aug-11 0 0 420 403 

Sep-11 1 0 421 402 

Oct-11 0 0 420 398 

Nov-11 0 0 419 393 

Dec-11 0 0 419 404 




KASOR 

Apr-11 30 0 432 412 

May-11 29 0 431 408 

Jun-11 14 0 424 405 

Jul-11 17 0 426 400 

Aug-11 13 1 424 20 

Sep-11 17 0 427 407 

Oct-11 30 0 431 408 

Nov-11 30 0 428 403 

Dec-11 19 0 428 406 






31

2010-11 

2011-12 

2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 


2010-11 



8. FREQUENCY PROFILE STATISTICS 

8.1 Frequency Trend for Last Two Financial Years 

51.00 

Frequency trend in Hz during last two Financial Years 

50.50 

50.00 

49.50 

49.00 

48.50 

48.00 


2010-11 Inst Max freq 2010-11 Avg freq 2010-11 Inst Min freq 

2011-12 Inst Max freq 2011-12 Avg freq 2011-12 Inst Min +freq 

8.2 Monthly Frequency Trend Comparisons 

100% 

Monthly Frequency Trend Comparisions for year 2010-11 and 2011-12 

75% 

50% 

25% 

0% 


Above 50.20 HZ >49.50 Hz and


9. GENERATION CAPACITY ADDITION 

9.1 Generation Capacity Addition during FY 2011-12 

Unit 

Generation Capacity addition during FY 2011-12 

Capacity in 

MW 

GUVNL 

Share in MW 

Date of 

Maiden synch 

Date of 

COD 

Scheduling 

started 

from 

APL - 6 660 500 03-Jun-11 01-Feb-12 

APL - 7 660 02-Oct-11 

APL - 8 660 09-Feb-12 

APL - 9 660 05-Mar-12 

Sipat Stage-I Unit - 1 660 180 01-Oct-11 01-Oct-11 

GSEG Stage -II Unit - 1 350 350 24-Oct-11 

Essar Vadinar Unit - 1 600 500 24-Nov-11 22-Feb-12 

ACB India Ltd. Unit - 1 135 100 06-Oct-11 13-Dec-11 01-Mar-12 

CGPL UMPP Unit - 1 830 394.25 08-Jan-12 07-Mar-12 

Wind Farm 600 

Solar 549 

Biomass 21 

ACB 

GSEG Stage -II 

Essar 

Vadinar 

CGPL UMPP 

Sipat 

Stage-I 

Renewables 

Wind Farm 

Solar 

APL (6-9) 

Biomass 



33


10. GRID EXPANSION 

10.1 EHV lines added in Gujarat Grid in year 2011-12 

Sr. 

No. 

Name of Line / Equipment 

Date of 

Commissioning 

1 220 KV Ukai – Vav line 2 LILO at Mota 9-Apr-11 

2 400/220 KV 315 MVA ICT 1 at Kosamba 14-Apr-11 

3 400 KV Hadala - Vadinar line - 1 25-Apr-11 

4 400 KV Hadala - Vadinar line - 2 25-Apr-11 

5 220 KV Bhat - Pirana (PG) line - 2 29-Apr-11 

6 400KV Vadavi - Chorania line - 2 29-Apr-11 

7 80 MVAR Bus Reactor at 400 KV Soja 30-Apr-11 

8 50 MVAR Bus Reactor at 400 KV Varsana 30-Apr-11 

9 125 MVAR Bus reactor at 400 KV Kasor 3-May-11 

10 400 KV Vadavi - Chorania line - 1 16-May-11 

11 220 KV Rajkot - Gondal line LILO at Kangasiyali 27-Jun-11 

12 220 KV Utran –Kosamba line -2 charged loc 50 4-Jul-11 

13 220 KV Kosamba – Zaghadia D/C line 09-Jul-11 

14 220 KV GSEG - Kosamba line - 1 24-Aug-11 

15 220 KV GSEG - Kosamba line - 2 24-Aug-11 

16 400 KV Bhachau - Mundra(CGPL) line - 1 29-Sep-11 

17 400 KV Vadavi - Bhachau line - 1 29-Sep-11 

18 400 KV Bhachau - Mundra(CGPL) line - 2 30-Sep-11 

19 400 KV Vadavi - Bhachau line - 2 30-Sep-11 

20 220 KV Nyara - Tebhada line – 1 01-Oct-11 

21 400 KV Vadavi - Kansari line - 1 16-Nov-11 

22 400 KV Vadavi - Kansari line - 2 16-Nov-11 

23 400 KV Chorania - CGPL Mundra line - 1 30-Jan-12 

24 400 KV Chorania - CGPL Mundra line - 2 30-Jan-12 

25 220/132 KV 100 MVA Trf at Botad. 8-Dec-11 

26 132 KV Dhandhula - Paliyad line LILO at 220 KV Botad 22-Dec-11 

27 400 KV Asoj - Ukai line LILO at Kosamba 2-Jan-12 

28 220 KV Dhrangadhra - Morbi line LILO at Lalpar 11-Jan-12 

29 220 KV Kheralu - Bhutiya line - 1 20-Jan-12 

30 220 KV Kheralu - Bhutiya line - 2 20-Jan-12 

31 220 KV Motipaneli - Sardargadh line - 1 21-Feb-12 

32 220 KV Motipaneli - Sardargadh line - 2 21-Feb-12 

33 220 KV Deodar - Shivlakha line LILO at Charanka 28-Feb-12 

34 220 KV Dhrangdhra - Lalpar line LILO at Halvad 2-Mar-12 

35 220 KV Savarkundala - GPPC line 17-Mar-12 

36 220 KV Otha - GPPC line 17-Mar-12 

37 220 KV Akriomota - Nakhatrana line LILO Jamanvada (WF) 29-Mar-12 

38 220 KV Nyara - Tebhada line - 2 30-Mar-12 



34


11. MAJOR INCIDENTS 

Date 

Time 

(Hrs.) 

Location 

Summary 

02.07.11 04:28 SLPP Zero power at SLPP Stage 1 

02.07.11 05:00 SLPP Zero power at SLPP Stage 2 

02.07.11 06:07 

SUGEN / 

SECo. 

Zero power at SUGEN and S.E.Co. 

04.07.11 05:38 

Kutch / 

Saurashtra 

Tripping of 400 KV Hadala - Jetpur line caused grid collapse 

in Saurashtra / Kutch area. There was a Generation Loss of 

1783 MW (1457 MW from APL + 53 MW from ALTPS + 178 

MW from KLTPS + 95 MW from STPS). 1700 MW load loss 

of Kutch and Saurashtra pocket. 

05.07.11 04:33 

Kutch / 

Saurashtra 

Tripping of 400 KV Hadala - Jetpur Line caused partial grid 

collapse in Rajkot / Kutch area. There was a Generation 

Loss of 1333 MW (1103 MW from APL + 20 MW from 

ALTPS + 165 MW from KLTPS). 833 MW load loss of Kutch 

and Rajkot pocket. 

22.12.11 14:43 UKAI TPS 

While Changing over 220 KV UTPS - Mota line No. 1 from 

Bus - 2 to Bus - 1, B phase jumper on Bus coupler bay and 

one conductor of twin conductor snapping led to 220 KV 

Bus - 1 fault at UTPS at 14:30 Hrs. In order to switch over 

all the feeders from Bus - 1 to Bus - 2, while taking 220 KV 

Ukai Hydro – Thermal Tie line 2 on Bus - 2, the isolator on 

Bus - 2 was closed at about 14:43 Hrs inadvertently 

without opening the isolator on Bus - 1 resulting in heavy 

flash over on Bus - 2 which caused snapping and 

grounding of B phase jumper of 220 KV Ukai Hydro – 

Thermal Tie line 2 and making it dead. Consequently, all 

generators of UTPS and EHV lines connected on Bus - 2 

tripped between 14:43:00 and 14:44:00 Hrs. 

27.03.12 00:05 

27.03.12 14:15 

220 KV Sachin 

S/S 

220 KV 

Kim – Mora 

& 

Kim – GSEG 

lines 

B-phase PT of 220 KV Bus “B “ flashed over resulting in bus 

fault at 220 KV Sachin S/S. Due to this occurrence, the Y Ph 

PT of Bus B also got damaged. The bus fault at Sachin S/S 

did not cause any generation loss, but load of 204 MW 

was interrupted. 

The 220 KV Kim – Mora & 220 KV Kim – GSEG lines tripped 

at 14.15 Hrs. During patrolling, sugarcane wastes were 

found burnt below between the locations 91 & 92. 

Tripping of these lines caused 101 MW generation loss at 

GSEG Power Station. 



35


12. ENERGY ACCOUNTING & SETTLEMENT AND STOA DETAILS 

12.1 ABT Meters Registered for Data Processing at SLDC 

No. of ABT Meters Registered 

As on 31.03.11 As on 31.03.12 

930 1123 

12.2 Nos. of UI Pool Members in UI Pool Account of SLDC 

No. of UI Pool Members in UI Pool account of SLDC 


60 67 

12.3 Users Registered under REC Mechanisms 

No. of Users registered under REC Mechanism 


1 25 

12.4 Short Term Open Access Applications Processed 

Year 

Short Term Open Access Applications Statistics 

No. of 

Application 

Received 

No. of 

Application 

Approved 

No. of 

Application 

Rejected 

2010-11 599 577 23 

2011-12 1187 1057 130 



36

Apr 

Apr 

May 

May 

June 

June 

July 

July 

Aug 

Aug 

Sept 

Sept 

Oct 

Oct 

Nov 

Nov 

Dec 

Dec 

Jan 

Jan 

Feb 

Feb 

Mar 

Mar 


13. THREE PHASE POWER SUPPLY TO AGRICULTURE SECTOR 

09:36 

08:58 

08:38 

08:11 

07:40 

Average supply Hrs 2010-11 Average supply Hrs 2011-12 

14. NETWORK LOSSES 

6 

% Losses 2010-11 % Losses 2011-12 

5 

4 

4.81 

4.23 

4.85 

4.57 

5.12 5.15 

4.32 4.30 

4.73 

3.47 

4.65 

4.29 

4.43 

3.90 

4.30 4.28 

3.38 

3.78 

4.07 

3.88 

3.89 3.83 

4.22 

4.15 

3 



37


15. SCADA & IT UPDATES 

15.1 Data Acquisition Updates 

Population of RTU 

RTU Category As on 31-03-11 As on 31-03-12 

Generating station and 

Substation Level 

94 113 

Solar 0 15 

OA consumer 0 20 

The OPGW is provided on 132 KV Asoj – Gotri – Jambuva route for reliable data 

transfer and acquisition. 

The Gujarat network is modelled more accurately in power system network analysis 

module. It is very much helpful for critical outage security assessment. 

15.2 IT Updates 

a) The New oracle server is procured and successfully commissioned to make energy 

scheduling and accounting process more efficient and accurate. 

b) The web based scheduling application is put in service for quick response to 

acknowledge the acceptance of declared capability of generators and subsequent 

revisions from them. 

c) The line outage management module is made operable in E-urja system. It enables the 

end user to avail planned and real time emergency outages of transmission elements 

and to assess the status of outage. A coding system through E-urja for line / 

equipment operation is introduced and it is very effective in avoiding any sort of maloperation. 

d) To make office IT network more secure, new Firewall system is purchased and put in 

service. 

e) To handle UI pool account effectively, a software application is got developed and 

made operational. 

f) For billing and invoices of SLDC fees and charges, a module is developed in E-urja. 

g) New Antivirus application is procured and being updated regularly to make SCADA 

system more secure. 

h) SSL certification is arranged for SLDC website to enhance security level. 



38


16. FINANCIAL FACTS & FIGURES 

16.1 Aggregate Revenue Requirement for the FY 2011-12 

SLDC is filing its Aggregate Revenue Requirement (ARR) independently from the FY 2009-10. First ARR 

was filed in Jan’2010 and since then SLDC has not looked back and achieved new feats towards 

becoming financially self-sufficient. 

A glimpse of the ARR for the FY 2011-12 is given below : 

Particulars 

Proposed by 

SLDC 

Rs. In Lacs 

Approved by 

Hon'ble GERC 

Employee Cost 900.61 775.94 

Repairs & Maintenance 78.21 40.51 

Admin & General Expenses 290.62 244.45 

Interest on Working Capital 30.55 21.76 

RLDC Fees & Charges 12.36 12.36 

Charges for ULDC & other Related Projects 814.98 814.98 

WAM Charges 22.66 22.66 

Less : Other Income 174.96 134.54 

Operating Cost Budget (a) 1975.03 1798.12 

Depreciation 99.39 81.56 

Interest & Finance Charges 112.40 86.9 

Return on Equity 88.49 61.3 

Total Fixed Costs 300.29 229.76 

Less : Expenses Capitalized 0.00 0 

Add : Provision for Tax 30.08 12.22 

Capital Cost Budget(b) 330.36 241.98 

Total Revenue Budget (a+b) 2305.39 2040.1 

On the basis of the above, tariff rates decided by Hon’ble GERC for SLDC is are : 

SLDC fees and charges FY 2011-12 

1 SLDC operating charges Budget (Rs. lakh) 1798.12 

2 Total MW capacity (Generating stations) 16973 

3 Total MW allocation (Beneficiaries) 20738 

4 Total MW 37711 

5 SLDC charges (Rs./MW/Month) 400 

6 SLDC capital charges Budget (Rs. lakh) 241.98 

7 SLDC Fees (Rs./MW/Half year) 320 

8 Grid connections fees (Rs.) 10000 



39


16.2 Major Figures for the FY 2011-12 

As per GERC directive, SLDC gets its Final Accounts audited from a Chartered Accountant from the FY 

2010-11. SLDC is near to closing its financial books for the FY 2011-12 after which it will be presented 

before a Charted Accountant for Statutory Audit; however, some major ‘unaudited’ figures for the FY 

2011-12 are as below : 

Rs. in lacs 

Particulars 

Amount 

Income : 

SLDC Charges 1566.06 

SLDC Fees 196.62 

STOA Scheduling 187.17 

STOA Application 54.54 

Grid Connection 3.45 

Miscellaneous Income 59.93 

Total 2067.77 

Major Expenses : 

Repairs & Maintenance 902.97 

Employee Cost 780.38 

Administration & General Exps.* 152.94 

Depreciation 37.5 

Finance Charges 2.25 

Loss on Sale 1.26 

* Including ULDC Charges 

Total 1877.3 



40


16.3 CAPEX Plan of SLDC 

A significant portion of SLDC cost arises because of the grid operations activities, which are to 

be carried out round-the-clock requiring adequate redundancy in resources to tide over 

contingencies. There is a heavy reliance on information technology with components having 

high obsolescence rate. A few of the applications (such as SCADA/EMS) are offered by a 

limited number of vendors and costs are high. 

In view of revised role of State Load Despatch Centre after enactment of Electricity Act’2003, 

it is necessary to strengthen SLDC to meet forthcoming challenges for the coming years. 

Accordingly, Capital Expenditure (CAPEX) is planned for modernization of SLDC, to strengthen 

and develop to meet all forthcoming challenges. 

CAPEX plan includes, projects mainly focused on system expansion, real time data 

requirements, installation & development of telemeter infrastructure, technological 

innovations and obsolescence & replacement of existing infrastructure, strengthening of 

existing data communication channels, billing & commercial centre development, system 

study and IT related infrastructure. SLDC CAPEX plan submitted to Hon’ble GERC in the MYT 

for the FY 2011-12 to 2015-16 is as follows : 

Sl . 

No. 

Particulars (Rs. In Lacs) 

(Rs. In Lacs) 

Estimated 

Projected 

2011-12 2012-13 2013-14 2014-15 2015-16 

1 Land Acquisition Cost 20 20 0 0 0 

2 Augmentation / Upgradation of Existing System 192 145 90 75 75 

3 Strengthening of Communication Channels 55 50 35 30 30 

4 Additional System / Software Planning 43 40 20 20 20 

5 IT Infrastructure 50 20 10 10 10 

6 SLDC Building Development 50 120 80 30 10 

7 Office Equipment 75 50 14 11 11 

8 Staff Recreation Facilities 10 15 15 5 5 

9 Additional Expenditure 2 2 

Total Capital Expenditure 495 460 264 183 163 



41


17. FOCUS AREAS 

A. Renewable Energy Integration 

High generation from RE (wind) sources: 

1. Over loading of 220 / 66 KV Shivlakha ICTs with power flow from 66 KV to 220 KV 

side. 

2. The loading of 220 KV D/C Tappar – Shivlakha line is almost near to the thermal 

loading capacity of the line. 

Less generation from RE (wind) sources: 

The loading on 400/220 KV ICTs at Jetpur, Hadala and Amreli is to the extent of 65 to 

70 % and it becomes difficult to avail outages on any of these ICTs. 

B. Continuous over loading of 220 KV Hadala – Nyara D/C line 

These lines are carrying power flow of around 220-230 MW on each circuit and 

despite keeping 220 KV S/C Tappar – Hadala and 220 KV S/C Rajkot – Jetpur lines OFF, 

they carry around 190 MW on each circuit. 

C. Continuous over loading of 220 KV Kawas – Ichhapore S/C line 

The loading on this line varies in the range of 200 to 300 MW due to continuous 

variable load of M/s. Essar Steel Ltd (ESTL). Despite keeping one or both circuits of 220 

KV D/C Haldarva – Kawas line OFF (as the flow is from Haldarva to Kawas), the loading 

on this line is quite excessive due to sale of power to M/s. ESTL on STOA, less 

requisition of DISCOM from EPOL (To adhere to merit order despatch). 

The issue has been discussed twice at Kawas NTPC in presence of WRPC, NTPC, M/s. 

Essar Power Ltd. and GETCO representatives and also, in OCC Meetings. Various 

options have been discussed and it is finalized to resolve the issue at the earliest. 



42


D. Transferring of 132 KV system load to 220 KV system 

The Gujarat system is now having cheaper generation from Adani-Mundra, Essar- 

Vadinar and Tata UMPP-Mundra power plants. Also, the minimum contribution from 

RE sources (Wind + Solar) is around 600 MW which, being green power has to be 

absorbed in the system. Overall frequency trend has improved. The generation 

available with Sikka TPS (STPS) and gas based power stations is costlier and DISCOMs 

are not giving schedule. So, the generation from STPS and Dhuvaran Gas Based (DGB) 

power station is scheduled only in case of extreme contingency. Also, GIPCL unit is 

kept under reserve shut down (RSD) so many times looking to merit order despatch. 

As the STPS, DGB and GIPCL units are connected to 132 KV system, non-availability of 

these units cause substantial loading on 220/132 KV ICTs at Rajkot, Limdi, Karamsad, 

Asoj and Jambuva. 

Considering above, it is very important to continuously monitor the 132 KV system 

and ensure that no part of the network becomes vulnerable and reliability is not put 

at risk. Therefore, it is required to transfer most of the loads of 132 KV system to 

nearest 220 KV system wherever feasible so as to relieve the loading on 132 KV 

system. 

E. PGVCL catering more than 3000 MW load without RE generation support: 

The Gujarat system is catering maximum energy from last week of September to end 

of November without RE generation support to the grid. At the same time, PGVCL is 

catering maximum load due to high potential rise in AG demand. In such conditions, 

many important lines and ICTs at major substations are loaded to about 70 to 80% of 

the rated capacity resulting in denial of outages for such lines and ICTs even for a day 

or two. 

F. Network complexity in South Gujarat Pocket: 

The units of GPEC, Essar-Hazira, Kawas are kept under reserve shut down or running 

on technical minimum for long time looking to merit order despatch. As a result, most 

of the time, the loading on 220 KV D/C Ukai – Mota, 220 KV S/C Kawas – Icchapore, 

220 KV D/C Jhanor – Haldarwa, and the EHV lines connected to 220 KV Vav and 220 KV 

Vapi S/S remain on higher side resulting in denial of outages of lines even for a few 

hours. 



43


G. Contingency of 400 KV S/C Sugen – Vapi Line Tripping 

The 400 KV S/C Sugen – Vapi line is carrying power flow of around 500-600 MW. 

Tripping of the said line may cause severe stress on EHV network of South Gujarat 

area. The PNA study case results are shown below for reference: 

Elements 

Normal Loading 

in MW 

In case of 

tripping 

400 KV Sugen - Vapi Line 374 0 

400 KV Sugen - Pirana 1 119 171 

400 KV Sugen - Pirana 2 119 171 

400 KV Sugen - Jhanor 155 298 

220 KV Kim - Sugen 1 50 -10 

220 KV Kim – Sugen 2 61 -10 

220 KV Utran - Vav 129 190 

220 KV Chikhli - Vapi 244 393 

220 KV Vapi - Vapi (PG) 140 347 

220 KV KAPP - Vapi 1 112 175 

220 KV KAPP - Vapi 2 112 175 

220 KV Kim - Vav 100 198 

220 KV Vav - Navsari 96 123 

220 KV Kawas - Vav 133 143 

220 KV Vav - Ichhapore 164 170 

220 KV Kawas - Navsari 1 161 188 

220 KV Kawas - Navsari 2 161 188 

220 KV Navsari - Bhilad 116 220 

H. Contingency of 400 KV S/C Hadala – Jetpur Line Tripping: 

At 400 KV Hadala S/S, the power injection from APL is around 800 MW and around 

300 MW from Essar-Vadinar. The 400 KV S/C Hadala - Jetpur line is carrying power 

flow of around 500 MW. Tripping of the said line may cause extreme overloading on 

220 KV D/C Hadala – Nyara line, ICTs at Gondal and Nyara which may endanger the 

whole Saurashtra network. 



44


Elements 

Normal 

Loading in MW 

In case of 

tripping 

400 KV Hadala - Jetpur 450 0 

400 KV Hadala - Chorania 104 266 

400 KV APL - Hadala 387 352 

400 KV Varsana - Hadala 381 346 

400 KV APL - Dehgam 1 238 276 

400 KV APL - Dehgam 2 238 276 

400 KV Chorania - Amreli 238 388 

400 KV Amreli - Jetpur -38 145 

220 KV Rajkot - Jetpur 134 302 

220 KV Rajkot - Gondal 0 0 

220 KV Gondal - Jetpur 

220 KV Chorania - Gondal 62 122 

220 KV Hadala - Nyara 1 215 302 

220 KV Hadala - Nyara 2 215 302 

220 KV Botad - Vartej 80 108 

220 Kv Karamsad - Vartej 77 100 

220 KV Savarkundla - Dhokadva 75 100 

I. Incorporation of voluminous revisions from generators and DISCOMs 

As per Hon’ble GERC Order 3 of 2010 dated 01 st April 2010, Gujarat State has 

implemented intra-State ABT mechanism with effect from 05 th April 2010 with 

participation of all generators and Distribution licensees. Thereafter, it has been 

generally observed that DISCOMs and Generators are responding to frequency 

changes quickly as they have to adhere to merit order despatch for economical 

operation. DISCOMs are changing schedule for many generators in their single 

requisition and implementation of RRF mechanism would also lead to frequent 

revisions from RE generators. Timely incorporation of voluminous revisions from 

generators and DISCOMs in real time, intimation to them, integration with SCADA & 

posting on website is the major task for SLDC. 



45

STATE LOAD DESPATCH CENTRE 

GUJARAT ENERGY TRANSMISSION CORPORATION LIMITED 

132kV Gotri Sub Station Compound, 

Vadodara 390021, Gujarat, INDIA 

Phone: 091-265-2352103,2322206 Fax: 091-265-2352019 

e-mail: sldc@gebmail.com

ANNUAL REPORT 2011-12 - State Load Despatch Centre (SLDC)

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