State Corporation Commission; distribution cost sharing program; required distribution system upgrades. Directs the State Corporation Commission by July 1, 2026, to establish by regulation a distribution cost sharing program for Dominion Energy Virginia and Appalachian Power to construct distribution system upgrades required to interconnect participating projects, as defined in the bill. The bill directs the Commission to require each such utility to file any tariffs, agreements, or forms necessary for the implementation of the program by December 1, 2026.