Wind farms improve on foundation mix design to reduce carbon footprint
The 140 MW Kangnas wind farm, in the Northern Cape, and the 110 MW Perdekraal East wind farm, in the Western Cape, have completed the 28-day strength tests of their first foundations, with a significant improvement in the mix design and savings in carbon dioxide (CO2) emissions.
The projects are two of the largest selected under Bid Window 4 of government’s Renewable Energy Independent Power Producer Procurement Programme.
The first foundations at each of the two wind farms were poured in November.
This was followed by a 28-day strength test to ensure the foundations achieved the required design strengths.
The foundations were designed using a 70% replacement of cement, which signalled a significant improvement in the concrete mix design for turbine foundations.
“For a project the size of the Perdekraal East wind farm, it means a saving of about 1 900 t of CO2, in relation to the previous concrete mix design,” says Perdekraal East and Kangnas wind farm construction programme manager Christo Loots.
“We are very pleased with the achieved reduction in our carbon footprint,” he adds.
Meanwhile, the Kangnas wind farm’s construction team is being led by construction project manager Manie Kotzé, who has confirmed that 12 foundations at the wind farm are already complete. He expects all 61 foundations to be in place by early July.
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