Funding Roundup: Investors Bet on Geothermal, Smart Grid and 'Green' Home Design

Several greentech investment firms, including one started by a former World Bank boss, are raising funds.

Google.org’s investments in geothermal-energy exploration last week highlighted the potential for harnessing the heat below the Earth’s surface to generate electricity (see Google Funds Hot Rock Technology). 

Geothermal energy is hardly new, but much of it has come from areas blessed with natural reservoirs of water and steam. Technology improvements in drilling and engineering steam fields are promising to deliver an extraordinary amount of energy from miles beneath our feet. 

Google.org said last week it would invest $10.25 million in “enhanced geothermal systems,” which involve creating geothermal fields in areas without natural reservoirs of water and steam. The technology promises to greatly expand U.S. electricity production and help the country rely less on coal-fired power plants. 

AltaRock Energy got $6.25 million from Google.org as part of a $26.25 million round for developing and demonstrating its EGS technology. The Sausalito, Calif., startup’s investors include Khosla Ventures, Kleiner Perkins Caufield & Byers, Google.org, Advanced Technology Ventures and Vulcan Capital. 

Potter Drilling, a Redwood City, Calif., company that is developing new ways to drill deep into the earth for geothermal energy, received $4 million. Google.org also gave $489,521 to the Southern Methodist University Geothermal Lab to understand and map geothermal-energy resources in North America.

The Google.org investments are chump change for developing a geothermal-energy facility using the EGS technology. Companies have to drill deep wells and inject water at a high pressure to fracture the hot rock. A well drilled nearby would then reclaim the hot water and harvest the heat to power the turbines nearby. 

Drilling a well miles into the earth would cost a couple of million dollars at least. Figuring out ways to control and manage the fractured hot rocks and reclaim the water for heat mining would be tricky. 

Investors often refer to a 2007 government-funded report that describes the awesome potential of the EGS technology to meet the United States’ electricity demand without spewing emissions seen today from coal-fired power plants. The report, crafted by a research team headed by the Massachusetts Institute of Technology, said the EGS technology could enable the United States to produce 2,000 times the electricity it consumed in 2005. 

Here is a rundown of more recent funding news:

PRIVATE:

Smart Grid:

Recycling:

 

 

Other:

 

 

 

 

 

 

PUBLIC:

 

 

 

 

FUNDS: