I just read this, but Google said last November that they have created a team to find cheap sustainable energy cheaper than coal:

The newly created initiative, known as RE<C, will focus initially on advanced solar thermal power, wind power technologies, enhanced geothermal systems and other potential breakthrough technologies.  RE<C is hiring engineers and energy experts to lead its research and development work, which will begin with a significant effort on solar thermal technology, and will also investigate enhanced geothermal systems and other areas. In 2008, Google expects to spend tens of millions on research and development and related investments in renewable energy. As part of its capital planning process, the company also anticipates investing hundreds of millions of dollars in breakthrough renewable energy projects which generate positive returns.

“We have gained expertise in designing and building large-scale, energy-intensive facilities by building efficient data centers,” said Larry Page, Google Co-founder and President of Products. ”We want to apply the same creativity and innovation to the challenge of generating renewable electricity at globally significant scale, and produce it cheaper than from coal.”

Could they develop the technology that so many have been hoping for and, well, assuming would happen? If not Google, maybe another company?