That's true, but I don't think there's a need to be plugged in the grid to enjoy energy generation. There are already a ton of things embarking their own energy generators (every single vehicle to start with) which aren't plugged in any grid. Batteries are also ubiquitous.

So there is definitely a need for small scale to very small scale energy generators, and dismissing a technology because it's unsuitable for large-scale generation doesn't seem wise to me.