OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
There are two ways to decompose aggregate indicator i.e. multiplicative and additive. Suppose that from year 0
to T, the aggregate V varies from V 0 to V T . There are two different ways to express such a change: the
multiplicative one and the additive one . Any decomposition can therefore be done
either multiplicatively or additively [Granel et al.]. An aggregate given as a ratio should be decomposed through
a multiplicative approach whereas an absolute change of an aggregate, usually given in the original unit of
measurement, should be run through an additive approach [Ang et al. 2003]. There are three ways to handle the
decomposition in time domain i.e. fixed base year manner, rolling base year and multilateral indices. Following
are the mathematical representation of aggregate indicators used in the energy analysis.
The aggregate energy consumption indicator [Park 1992, Sun 1998]
Where, E = Total industrial energy input (energy unit), Q = Total industrial production (monetary unit),
; represents the energy intensity and represents the share of industrial production.
The aggregate energy intensity indicator [Gozalez and Suarez 2003, Choi and Ang 2002]
The aggregate CHG emissions indicator [Sun and Ang 2000, Ang and Liu 2001]
Where C is the total CHG emissions and the CHG emissions are due to fuel type j.
There are various methods available to perform an IDA such as Laspeyres index, Divisia Index, mean-rate-ofchange
index method and many more. The sequence to be followed while performing an IDA is
1. Choose the aggregate indicator you want to decompose
2. Decide whether to go through an additive or multiplicative approach on the basis of the problem.
3. Choose the IDA method you want to use, do it wisely on the basis of the problem.
4. Decide whether to use a fixed or a rolling base year.
Table 1 Trends in Energy Consumption and Energy Intensity in India
(Energy Statistics 2012, Ministry of Statistics and Program Implementation, GOI)
Year Energy Consumption GDP (Rs. Crores ) Energy Intensity
in Billion kWh
1970-71 663.99 517148 0.1284
1975-76 840.53 596428 0.1409
1980-81 1012.58 688320 0.1456
1985-86 1477.50 766135 0.1653
1990-91 1902.75 852297 0.1594
1995-96 2436.77 939540 0.1593
2000-01 3154.28 1034931 0.1553
2005-06 3909.37 1117734 0.1374
2006-07 4226.78 1134023 0.1355
2007-08 4508.26 1147677 0.1325
2008-09 4845.25 1161495 0.1166
2009-10 5462.31 1175480 0.1224
2010-11 5693.54 1182105 0.1167
3.2 Trends in energy consumption and energy intensity in India
Energy intensity is the amount of energy consumed for generating one unit of Gross Domestic Product (GDP) (at
constant prices). Energy Intensity is the most used policy indicator. In a developing country like India, where the
data on consumption of non-conventional energy from various sources, particularly in rural areas are not
available, Energy Intensity is generally computed on the basis of the basis of the consumption of conventional
energy [Energy Statistics 2012, Ministry of Statistics and Program Implementation, GOI].
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