General Electric is significantly scaling back production of its sodium-ion Durathon batteries, a move that comes amid what the company says is a slow-to-develop market for grid-scale energy storage -- or, at least, not as fast-growing as it hoped it would be by now. GE announced that it’s reassigning about 400 workers at the Schenectady, New York plant to other operations, leaving only about 50 to staff the facility, according to local newspaper reports. The plant, built at a cost...