Failing to find many investment opportunities, Internet search giant Google has begun developing its own green technology and may soon have some breakthroughs.

That's according to Bill Weihl, Google's green-energy czar, who spoke at the Reuters Global Climate and Alternative Energy Summit that began on Tuesday.

In November 2007, Google announced a plan to invest hundreds of millions in technology to find a renewable-energy source for electricity cheaper than coal. Since then, the company has admittedly invested "less than $50 million."

Google had intended to invest much more, but it has not been able to find many qualifying companies or projects, Weihl told Reuters.

Rather than wait for better ideas to come along, the company has been developing its own technology, including better mirrors for solar-thermal plants and solar-powered turbines for generating electricity.

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