Community choice aggregators (CCAs) have become a formidable player in California’s electricity markets, taking over the role of supplying electricity to millions of customers from the state's investor-owned utilities, announcing big-time clean energy contracts and pushing regulators to add flexibility to state rules that stymie the growth of CCAs. A Monday announcement again underlines that expanding influence: eight CCAs have teamed up on a joint powers authority, an entity joining public agencies in service of a common goal. In this case, the goal is buying larger amounts of clean energy; many of California’s CCAs have renewables targets more aggressive than those of the state at large.