[marssaxman]

And yet, the solar panels I installed on my Seattle house a decade ago generated enough power to pay for themselves in six years. Solar works great here. Overcast skies are not a problem: solar panels don't care which direction the photons come from, and they work more efficiently at cooler temperatures.

[littlestymaar]

> And yet, the solar panels I installed on my Seattle house a decade ago generated enough power to pay for themselves in six years.

That tells something about your local electricity market though, not about the energy or CO2 emission efficiency.