If theres not a project near you then im not 100% sure wether they sell you energy from their projects or source renewables from the exisiting market at market rates
You sign up for a project that they have in the pipeline and then choose how much you want to invest in the project, based on the percentage of the power produced by the project. Then after paying your investment over several months, you will own a part of the co-operative that owns the wind turbines/solar panels. Ripple get the project built and set up the co-operative that will own the project. The energy generated is taken off your electricity bill, but you still have to pay standing charges and the like. There's several electricity providers that work with ripple and allow you to credit the electricity generation against your electricity bill, but the main one currently is Octopus energy.
The Guardian published an article on their shared energy scheme a few months ago, which seems decent value (although £3k for £200/yr savings isn't mind-blowing).
This campaign may be a cynical bid to harvest emails of potential customers but they do mention onshore wind and they may be betting on Labour removing a lot of the Tory restrictions on it and a map of people supporting green energy may help them overcome the NIMBYs.
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That built into their TOC isn't very alarming at all.