On Wed, 12 Sep 2012 17:14:57 -0400, Sarah Ehrett
wrote:

When someone can successfully power a medium sized US city 24/7 using solar
and wind then I'll be impressed.

That might be possible right now using energy storage technology. It
would not be cost justified at this time however.

Until then we're tied to oil, coal, and
natural gas because the environmental nutters are against nuclear power.

There are some very real issues with nuclear power. Fusion is the
big pie in the sky if someone can figure that out.