General Electric Co. GE 1.53% plans to unveil a new battery platform Wednesday as it seeks to become a leader in the emerging market of storing electricity. GE is set to announce a giant battery platform called GE Reservoir that can store power generated by wind turbines and solar panels for later use. It can also be used to add jolts of power when needed to stabilize voltage and frequency on the electric grid. The battery storage market, currently tiny, is expected to grow considerably in the next decade—and already features big-name competitors including Tesla Inc., TSLA -1.54% which deployed an enormous battery system in Australia last year. Siemens AG paired with AES Corp. last year to launch Fluence Energy LLC, a joint venture that is building what is expected to be the world’s largest lithium-ion battery in California. “Energy storage is like a Swiss Army knife—there are […]