…“Even with the tightening of the RGGI cap, it remains difficult to attribute specific quantities of emissions reductions to any single political, market or economic factor,” said Jordan Stutt, a policy analyst at Boston’s Acadia Center, a nonprofit that tracks the RGGI program. “However, the tightening of the cap has led to higher RGGI allowance prices, creating a more significant incentive to generate electricity from cleaner sources and to invest more heavily in energy efficiency.”…