The sun has been in a particularly prolonged and deep solarminimum for the last couple of years, with fewer sunspots and solar storms erupting on its surface.
So the real controversy is what minimum level of solar energy at 65N is the threshold for the descent into an ice age and how unstable the weather becomes near that threshold.
The RPS would require utilities to use a minimum percentage of clean power--such as wind, hydropower or solar energy--in their overall fuel mix, or it would require electric companies to buy renewable credits from each other.