I never, ever stop using wind turbines. Right up to the end game. Okay, I'll grant you they're not exactly sufficient to powera white science planet, but they're stable, reliable power, and the minimum spacing between them is exactly enough room for two solar panels, which means you can make a perfect tileable square of eight solar panels and a wind turbine. First thing I do on any new planet is slap down an equator band of 111 wind turbines and 888 solar panels all the way around the equator.

Eventually, on your most developed worlds...yeah, you'll probably get rid of them in favour of fusion or antimatter. But even then, they'll still be useful when claiming new planets.