Little more nuance to this. Tax credits aren’t funded by electricity ratepayers, so that has nothing to do with electricity prices going up and a lot to do with renewables helping push them down (or keeping them from rising faster).

Net metering is complicated. For a while — ballpark the first 30% of households adopting solar, for example, which Maine is nowhere near — the benefits of having that distributed generation taking strain off the transmission system during peak hours, which saves everyone money, outweigh the reduction in bills those customers get. It’s true that eventually in theory if everybody net metered we wouldn’t be able to cover the cost of the grid with per-kWh rates, but many of the costs that have historically been recovered with per-kWh rates are probably better recovered with fixed customer charges anyway, so if the PUC keeps up with net metering by raising the fixed charge appropriately everyone will still pay a fair share, and we’ll all be paying less that we would’ve otherwise.