Energy storage can play an important role in a transition to clean energy, but only if it’s deployed within an effective policy framework. Emissions reductions are possible if the storage is charged with low-emissions sources and displaces high-emissions sources when discharged. But ill-timed charging and discharging can increase emissions. That is why, together with WattTime, we urged the Connecticut Public Utility Regulatory Authority (PURA) to ensure that the Connecticut Green Bank’s energy storage program reduces emissions as much as possible. PURA adopted our recommendations to target the energy storage incentives to areas with the highest differential between the highest and lowest marginal emissions rates so batteries could ultimately lead to reductions in emissions. In addition, PURA directed the Connecticut Green Bank to review our comments when setting the scope of the program's marketing plan.