Final EIAR - Aurecon AME Environmental | Environmental Projects

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Proposed Wind and Solar (Photovoltaic) Energy Facilities on Kangnas Farm near Springbok in the Northern Cape: Final EIR 38 Each turbine would have a transformer that steps up the voltage from 690 Volt to a medium voltage +/- 33 kilovolt (kV). This transformer is housed within each turbine tower or immediately outside the turbine. The electricity distribution infrastructure would comprise of a double circuit transmission line between the wind farm main substation (Kangnas) and existing the Eskom Nama Aggeneys 220 kV grid line. The existing Eskom 220 kV line will be turned into and out of (looping in and looping out of the proposed Kangnas Substation) with two separate overhead 220 kV lines for a maximum of 1 km before the two lines will become a single double circuit transmission line to the proposed Kangnas substation. There will be a single track gravel access road for maintenance purpose to the two lines and double circuit transmission line to Kangnas Substation. The proposed route to the Eskom grid is approximately 20 km long. The transmission lines would be routed within a 200m corridor (i.e. 100 m on either side) which will allow for minor servitude alignment deviations should sensitive features be identified during the construction phase. The total Kangnas main substation size is expected to be a maximum of 200 m x 200 m or 4 ha. The transmission line between the proposed Kangnas sub and Eskom’s grid will be (132 – 400 kV) (the existing Eskom grid onsite to be connected to is 220 kV, through discussions with Eskom it has been noted that Eskom is doing away with all 220 kV line’s across the national network over time. At the time of submitting this report no clarity had been received from Eskom if the line would be upgraded or downgraded to 400 or 132 kV, or at what point in time this will happen). The proposed project could connect to the grid via two satellite substations (100 x 100 m) that would link sectors of the facilities to the main proposed Kangnas wind energy facility substation which would connect to the double circuit overhead line. The satellite substations would consist of medium (22 - 66 kV) to high voltage transformation (132 – 400 kV) with the associated Eskom required switchgear, telecommunications, storage, control room, access road, bus bars, overhead gantries, fencing and all other generic substation infrastructure. There would be a single track gravel access road for maintenance purpose to the substation. At the proposed Kangnas substation the voltage would be increased and evacuated via the existing 220 kV Eskom (or future 132 – 400 kV) power line crossing the northern portion of the site (see Figure 3.8). The main substation would consist of medium (22 - 66 kV) to high voltage transformation (132 – 400 kV) with the associated Eskom required switchgear, telecommunications, storage, control room, access road, bus bars, overhead gantries, fencing and all other generic substation infrastructure. There will be a single track gravel access road for maintenance purpose to the substation. The total main substation size is expected to be a maximum of 200 x 200 m or 4 ha. The proposed wind energy facility would be constructed in four 140 MW phases. Table 3.2 provides details of the construction and operation requirements for the four phases. The timing of phases would depend on the developer's success in the respective renewable energy IPP bidding rounds. The timing and format of the bidding rounds as decided by DOE, and the available grid capacity as determined by Eskom on the grid. © Aurecon (2012) No unauthorised reproduction, copy or adaptation, in whole or in part, may be made. P:\Projects\108495 Kangnas WEF & PV EIA's\3 Project Delivery\4 Reports\FEIR\FEIR 210213 Final.doc
Proposed Wind and Solar (Photovoltaic) Energy Facilities on Kangnas Farm near Springbok in the Northern Cape: Final EIR 39 Table 3.2 Construction and operation requirements of the four phases of the proposed wind energy facility 18 PHASE A B C D Total No. of Turbines ±65 ±65 ±65 ±65 ±2 60 MW Produced 140 140 140 140 5 60 New Roads (km) 58.5 34 34 33 159.5 Existing roads to be upgraded (km) 25.2 30.5 55.5 33.5 144.7 Cables (km) 83.7 64.5 89.5 66.5 304.2 Footprint (ha) 94.6 74.9 1 00.4 76.9 346.8 Water (construction) (m 3 ) 64 948 60 809 66 200 61 240 253 197 Water (operation) (m 3 /day) 3.4 3.4 3.4 3.4 13.6 Approximately 253 197 cubic meters (m 3 ) (or an average of 87.9 m 3 per day) of water is required for the construction phase of the proposed wind energy facility is. During the operational phase it is anticipated to be 13.6 m 3 /day during peak maintenance periods. Mainstream has indicated that water could be sourced from underground sources (if available) and, if required, Mainstream will apply for a WUL once it has been confirmed that they are a preferred bidder. Mainstream will however apply to DWA and or other relevant water control authorities for a non-binding letter (project and phase specific) confirming the water availability for the proposed projects. Turbines are designed to operate continuously, unattended and with low maintenance for more than 20 years or greater than 120 000 hours of operation. Once operating, the proposed wind energy facilities would be monitored and controlled remotely, with a mobile team for maintenance, when required. There would be basic operation and maintenance including storage facilities on site. A number of jobs during the construction phases and operational phases of the proposed wind facility would be created. The proposed project would make use of local labour as far as possible. As many of the jobs as possible would be filled by people local to the wind farm area. Records would be kept of local jobs produced and the process used to procure man hours from the local market. Table 3.3 provides a breakdown of the employment opportunities for the proposed wind energy facility. Table 3.3: Employment opportunities, and breakdown per skill set, per phase of the proposed wind energy facility for a total of 750 MW windfarm development Phase Permanent Highly Skilled Skilled Unskilled Construction 285 71 403 686 Operation 130 0 14 55 Training would be provided for technicians to operate the facilities by the suppliers of the turbines. As per Section 2.1.5, Mainstream is planning to apply for an IPP contract in the third bidding round in August 2013. The construction period is anticipated to last 12 – 18 months for each 18 Note that the number of turbines is based on a 2.3 MW machine – the number of turbines would change if smaller or larger capacity turbines are to be used. © Aurecon (2012) No unauthorised reproduction, copy or adaptation, in whole or in part, may be made. P:\Projects\108495 Kangnas WEF & PV EIA's\3 Project Delivery\4 Reports\FEIR\FEIR 210213 Final.doc
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