1955 portfolio company, Gridtential, an innovator in low-cost, high-performance energy storage technologies, announced today that it has appointed John Barton, former President of Global Asset Management for SunEdison, as Chief Executive Officer of Gridtential. The company also announced that Bob Gruenstern, former Johnson Controls Global Vice President for Product and Advanced Engineering, joined its Technical Advisory Board. Both Barton and Gruenstern bring decades of critical operations and product development expertise as Gridtential accelerates plans for the commercialization of its patented Silicon Joule® battery technology.