VIDEO: Electricity Out of Thin Air? PG&E Exploring New Type of Clean Energy

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A 120-foot-tall rig digs a mile into the earth in San Joaquin County. Engineers and geologists will then analyze the samples to determine whether the earth could support a compressed air facility.

A 120-foot-tall rig digs a mile into the earth in San Joaquin County. Engineers and geologists will then analyze the samples to determine whether the earth could support a compressed air facility.