Ask HN: solar energy, how can i buy? can i buy online?

Not exactly the right place for this question perhaps but lets say I want to have solar energy in my home and not coal or nuclear or whatever.

Are there companys that produce such power and sell it coming in as electricity to my house or the only option is to buy my own solarcells and put them on the roof of my house?

If I live in an apartment I cant choose right?