Solar export payment per kwh versus Kirk Hill payment

We recently had solar and home battery storage installed, to go alongside my Kirk Hill and Derril Water project shares. I'm wondering how it is that I can get 15p from Octopus for exporting my solar to 'the grid', where the payments per Kwh for the Ripple projects are currently forecast to be a lot lower? I understand that there are likely to be commercial reasons for offering good export rates to attract customers, but I wondered if there's something else going on which explains the large difference in payments for renewable generation?

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