Weyerhaeuser agreed to let AltaRock Energy explore 667,000 acres of its land holdings in Washington, Oregon and California for the potential...

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Weyerhaeuser agreed to let AltaRock Energy explore 667,000 acres of its land holdings in Washington, Oregon and California for the potential to develop geothermal energy, AltaRock said today.

AltaRock, which is based in the Bay Area but has offices in Seattle, said it could convert up to 40 percent of the acreage rights granted by the Federal Way-based lumber giant to geothermal development leases within two years.

AltaRock aims to feed the U.S. power grid by injecting water into hot rock deep beneath the surface; the hot water would then be sipped out of the ground and its heat used to generate electricity.

Weyerhaeuser said the deal could help “release the full potential” of its land holdings.