Why green energy is like a bicycle on a freeway?

I am still trying to find a good metaphor for the current green energy problems. Here's my latest attempt:

Small payload
Hostile infrastructure
Weather dependency

Update: A good example of misguided thinking on the subject. People just don't get the idea of the infrastructure mismatch:

"Maximizing the number of people who go solar is a paramount policy — it affects air pollution consideration, climate change considerations and the development of green jobs," said Adam Browning, executive director and co-founder of Vote Solar Initiative, a San Francisco nonprofit seeking to bring solar energy into the mainstream. "So why are we talking about stamping on the brakes when we should be talking about pushing on the accelerator?"