Ingula Power Station 400kV

Yard Stringing and Cabling Project

Gridbow was entrusted by Eskom for the Stringing and Cabling of 4 x 400kV Generator Bays in the HV Yard. Most exciting was the fact that due to the critical nature of the project, a rigorous selection process had to be undertaken of which Gridbow was successful. This was also during a time that South Africa was in desperate need of extra generating capacity hence there was no room for error or delay. The project was successfully undertaken and completed on time thence contributing to the extra Megawatts that the country needed. Ingula is a pumped storage scheme with a planned output of 1 332MW. The Ingula pumped-storage scheme, located within the Little Drakensberg mountain range, 23 km north-east of Van Reenen’s Pass, will comprise an upper dam (Bedford) and a lower dam (Braamhoek). The upper reservoir site is located in the Free State and the lower reservoir site in KwaZulu-Natal. The escarpment forms the border between the two provinces. The distance between the upper and lower reservoirs will be 4.6 km, with an elevation difference of about 470 m. The reservoirs will be connected through underground waterways and the underground powerhouse complex, which will house four 325 MW pump turbines with a total capacity of 1 300 MW, a machine hall, a transformer hall and associated tunnels, shafts and caverns. The twin headrace waterways, consisting of concrete and steel-lined headrace tunnels, pressure tunnels and shafts, will link the upper reservoir with the pump turbines. The draft tubes, concrete-lined surge shafts and a single concrete lined tailrace tunnel will connect the pump turbines to the lower reservoir. The upper reservoir is a concrete faced rock-fill embankment dam, 41 m high, with a total capacity of 22.4-million cubic metres and an active water storage volume of 19.2-million cubic metres. The 39-m-high lower dam comprises roller-compacted concrete, with a total capacity of 26.3-million cubic metres and an active storage volume of 21.9-million cubic metres. The scheme will be operated on a weekly cycle and will have an overall cycle efficiency of 78%. Gridbow is very proud to have been part of this project.



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Majuba Power Station

HVAC Project

Air Conditioning is a very important part of any Power Station Operation due to the excessive temperatures that are generated. A power station would trip immediately if there was no working air conditioning systems, as high temperatures can cause irreparable damage to and Injury to people and equipment. Only the best HVAC (Airconditioning) Technicians would qualify to manage the air conditioning work at a power station. Gridbow currently has the contract to manage and maintain all air conditioning work at Majuba Power Station in Mpumalanga on behalf of Eskom. We are currently responsible for all installation, maintenance (Routine and Fault) and standby duties at the power station. We maintain a high standard of service and SHEQ performance for our client. Gridbow is also doing work at Grootvlei Power Station, Lethabo Power Station and at Eskom College where we are the appointed contractor as well.




Emalahleni Municipality

Lady Frere (Jiputha) Electrification Project

Many rural and underprivileged communities across South Africa remain without electricity and the South African Government has made it one of its top priorities to electrify everyone. This task requires companies like Gridbow to deliver on the projects they will have been allocated. Jiputha is a small village under the Emalahleni Municipality in Eastern Cape. Gridbow was allocated an electrification project to electrify 300 households in 12 weeks. The ground in Jiputha is rocky and the terrain is mountainous. Gridbow managed to complete this project during the allocated time and this project left a lasting impression on the community as we used local labour and we also provided electricity which changed people’s lives for the better.

Scope of work included:
  • Rock drilling and manual digging of the holes for poles and stays
  • Dressing of poles
  • Pole erection
  • Stringing
  • House connections
  • Data collection for all connections