Published: 8 Apr 2021, 11:48 By: Andy Colthorpe A proposed large-scale battery storage project in Morro Bay, California that Vistra Energy is planning to build. Image: Vistra. US power generation holding company Vistra has renewed its call for legislation designed to assist the transition from coal to renewable energy in the US state of Illinois. The call for the introduction of the Illinois Coal to Solar and Energy Storage Act comes as Vistra announced the early closure of the 1GW Joppa Power Plant operated by one of its subsidiaries. The plant had been scheduled for closure in 2025, but that has been brought forward to 1 September 2022.