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US NEWS 
February 12, 2018, by Christopher Martin and Mark Chediak
(Bloomberg)
Natural gas is getting edged out of power markets across the U.S. by two energy sources that, together, are proving to be an unbeatable mix: solar and batteries.
In just the latest example, First Solar Inc. won a power contract to supply Arizona’s biggest utility when electricity demand on its system typically peaks, between 3 p.m. and 8 p.m. The panel maker beat out bids from even power plants burning cheap gas by proposing to build a 65-megawatt solar farm that will, in turn, feed a 50-megawatt battery system.
It’s a powerful combination for meeting peak demand because of when the sun shines. Here’s how it’ll work: The panels will generate solar power when the sun’s out to charge the batteries. The utility will draw on those batteries as the sun starts to set and demand starts to rise.
Just last week, NextEra Energy Inc.’s Florida utility similarly installed a battery system that’ll back up a solar farm and boost generation. In California, regulators have called on PG&E Corp. to use batteries or other non-fossil fuel resources instead of supplies from gas-fired plants to meet peak demand.
Arizona Public Service Co. spokeswoman Annie DeGraw said the bid the utility received from First Solar was “very competitive, and it had the added benefit of being clean.”
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