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For years, renewable energy companies have faced a problem: How to store the mass amounts of energy they produce for later use. Batteries may be just the solution. In California, there's now enough grid-scale battery storage to power millions of homes for a few hours. Battery power is often the second largest source of energy on a given day in the state. So, we're revisiting the fast-growing technology with [https://www.npr.org/people/1200794832/cooper-katz-mckim"target="\_blank"]( Cooper Katz McKim, a producer on _The Indicator from Planet Money_. **Listen to the** [https://www.npr.org/series/1265481061/the-indicator-takes-on-batteries"target="\_blank"]( **three-part battery series** **.** _Have questions about the future of energy? Contact us at_ [_shortwave@npr.org_](mailto:shortwave@npr.org)_._ Support public media with NPR+ and enjoy perks for over 25 podcasts like this one. This show’s perks include sponsor-free listening. Learn more at [http://plus.npr.org/"target="\_blank"]( plus.npr.org. See [pcm.adswizz.com]( https://pcm.adswizz.com">pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. [NPR">https://www.npr.org/about-npr/179878450/privacy-policy">NPR](<a href=) Privacy Policy