Check out FT.com for an article about solar in the US reaching grid parity. Looks we are well past the point when solar makes the most sense economically.
According to SunPower CEO, his solar panels are cheaper than nuclear, and cost competitive with gas and coal. Add in the hidden costs savings related to the environment, human health, and economic stability and you've got the winning combination that oil, coal and nuclear companies don't want you to know about.
First Solar is now able to compete with other forms of energy on the grid during peak demand periods. By further improving their ability to produce thin film solar First Solar expects to be cost competitive with non-renewable, polluting forms of energy like coal, gas, oil nuclear within about three years.
As more and more countries make the move to feed-in tariffs that provide the most cost effective way to introduce renewable energy, the increasing volume of business is bringing the vision of grid parity within reach. As volumes start to exceed the million megawatts per year in shipping solar photovoltaic the price continues to drop around all systems related. With no fuel costs, the economic certainty offered by renewable options, coupled with increasing availability of large scale storage technology, both hydro based (pumping water into a reservoir for use later during peak demand using hydro) and with the rapid adoption of electric cars that require advanced battery storage systems.
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