I think op is pricing correctly (installed capacity rather than energy generated). A typical domestic solar installation in the UK costs around £6000 for a 4kW

I think op is pricing correctly (installed capacity rather than energy generated). A typical domestic solar installation in the UK costs around £6000 for a 4kW system, which works out at around £1500 per kW installed capacity. This makes the Apple's schemes seem pretty expensive in comparision, especially as one would expect large schemes to benefit from economies of scale. But, as mentioned, we don't know how much of the fund has directly gone into building renewable energy schemes so it's not a fair comparison.