Form Energy’s Utility-Sized Battery Can Run for Four Days

There may be no better time to launch a utility-sized battery that lasts four days than the aftermath of back-to-back hurricanes.

Form Energy Inc. has developed a battery that can feed electricity to the power grid for 100 hours straight, 25 times longer than most grid-tied batteries today. Now, the startup’s first factory — built on the site of a former West Virginia steel mill — is making cells and modules to be installed at power plants starting next year, from Colorado to Virginia. They will arrive at a moment when the power grid faces an inflection point. Electricity demand is ...