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It depends if you are making a financial or an environmental choice. Usually, you can rarely have both at the same time.
The financial choice is easy. What is your opportunity cost? If it was a no brainer you'd already have panels on your roof.
The environmental choice is a bit more touchy. Because it is hard to put a $ sign next to the value you allocate to the environmental aspect. I suspect that is the reason most people are waiting.
You don't see many solar panels around here mainly for 3 reasons:
Cost per kWh can be as low as 4.33¢/kWh if you use bi-energy, but is usually 5.4¢/kWh.
We get long winters with plenty of snow.
Over 90% of our electricity comes from hydro and most people think it's green. Probably because it's historically been compared to coal.
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