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Join us

Invest to support a new generation of UK solar

You’re invited to join us as an Investor Member. You can invest any amount from £100 up to £100,000.

Your investment will support a new generation of community solar across the UK. We aim to pay you a fair annual interest rate of 2% above Bank of England base rate, and a minimum of 5%.

For all the details of our offer see our share offer document, which has been updated for 2024 with details of our existing and new sites.

Investing is easy via the secure online form – you can pay by credit or debit card, bank transfer or cheque. If you prefer a paper application form you can download this here.

In joining us you’ll be in good company: we have over 450 Investor Members from all over the UK who have collectively invested over £1.2 million.

For an introduction to investing in the Big Solar Coop see our online Q&A session recorded in November 2023.

If you have further questions before investing then please have a look at our Investment FAQ or email

More than one type of return

We are offering different kinds of return on investment:

Environmental: we are a carbon-first initiative and our primary concern is to fight the climate crisis. By joining and supporting the Big Solar Co-op you can be making a larger contribution to decarbonisation than you could by investing in solar at home.

Social: you will be joining an organisation that is bringing a new model to solar, involving many more people directly in practical action. Our panels are reducing energy bills for a range of sites, from industrial users to public buildings. We’re working to bring co-operatively-owned solar to places which are less sunny and less wealthy, with all our surplus re-invested in solar.

Financial: Our interest rates are competitive and your investment in Big Solar Co-op is designed to  be flexible so it is easier to get your money out if you need it.

Invest your time

The Big Solar Co-op has been created from the ground up to enable volunteers to be more effective in fighting the climate crisis. So if you have any time to spare, there are lots of things we can do together, within a supportive and effective organisation – get involved!