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Westmill Solar

Social performance

Westmill Solar Co-operative believes that solar power is a clean, viable alternative to traditional energy production.

Cooperatives stand for equality. They mean one member, one vote, no matter how many shares are owned. They also mean that profits are shared by the members so when the cooperative does well, the members do well.

Key Social Performance Indicators (KSPIs)

KSPIs are a measure of how the business is performing on delivering its main social or environmental purpose. Read more

Carbon dioxide saved

The 4.8MW solar installation was forecast to save just under 2,000 tonnes of carbon dioxide a year, declining year on year as the panels age. In 2016, actual savings exceeded forecasts by 6%.

Community investment

The Co-operative is committed to donating 1% of revenue to Westmill Sustainable Energy Trust (WeSET). WeSET is a charity set up to support educational work, energy efficiency advice and practical actions such as the insulation of the local Watchfield Village Hall.

In addition, Westmill Solar has established a Community Fund, which will support clean, green energy projects and other associated good causes locally, nationally and around the world.

In 2016, £98,226 was given through the Community Fund including:

  • £5,000 to WeSET towards the installation of solar panels on Watchfield Village Hall, adding to funds already raised by the community;
  • £10,448 to WeSET and Low Carbon Hub to help them work together on developing the WeSET education and schools visit programme across Oxfordshire;
  • £900 to WeSET for an upgrade to their website;
  • £5,000 to Low Carbon Hub (LCH) to develop its “People’s Power Station” project enabling communities to map the energy generation and LCH to encourage development of a sustainable county energy network;
  • £5,000 to Community Energy England for its fuel poverty campaign; and
  • £5,000 to support renewable based charities in the developing world:
    • SolarAid
  • £20,403 (equivalent to 1% of 2016 turnover) was paid to WeSET to support their educational and creative work in promoting sustainable energy and energy efficiency.


Clean Energy Generation


In 2016 the solar plant generated 5,080 megawatt hours (MWh) of electricity, the equivalent consumption of 1,639 households. This was 15% higher than the P50 forecast output of 4,422MWh (on which the projections set out in the share offer document were based) and similar to the 5,072 MWh generated in 2015.

This amount of generation means that each of Westmills 1,517 members can take credit for 3,348 kWh of carbon-free electricity. Or, put another way, members who use the 3,100 kWh typical medium consumption of a UK household have effectively off-set all of their carbon emissions from their electricity usage.

Common environmental performance indicators (CEPIs)

CEPIs are environmental performance indicators that are common to all businesses, no matter what their main business activity is. Read more

Westmill Solar does not measure the environmental impact of its business as it has no direct employees. However, the Co-operative is managed by Ethex who do report on environmental performance here

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