Arguably Tesla is doing exactly that. Solar is cheap and available these days, wind is growing consistently. The main issue is smoothing out the spikiness of these sources as they scale to significant parts of the grid. Tesla is the only company I hear about in a real "boots on the ground" kind of way, with notable projects deployed in recent years and a consistent effort to scale those projects up - everything else I've seen is in development, barely started, or vaporware.