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Paul wrote To me, the biggest concern faced by utilities at this time is global warming and potential carbon capping regulations.

I understand, but the key word is potential. The key item is time frame. It takes a great deal of time to build a power plant - 5 to 10 years even for natural gas. While many people are concerned about carbon emissions from coal plants, net carbon emissions for charging electric cars are less then 40% of the gasoline costs for even 30 mpg cars.

If your time frames for investment i.e. until death are under 20 years I would forget this issue. I wish I had a dollar for every time I have been told Phillip Morris was dead -- it out lived General Motors.

My prediction is some new technology will happen - probably more efficient solar. When I hear about the demise of coal power plants, I think about the concerns with horse droppings in 1900. There was an article in Scientific American in the 1890s saying the island of Manhattan would collect enough horse droppings to cover the entire state of Iowa 1 foot deep each year. Along come the auto and down drops the horse dropping problem.

I believe current solar cells are will under 10% efficient. It is not hard to think a NASA type program could push the efficiency into the mid 20s.

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