Members of The Brattle Group have led the analysis of five successive Integrated Resource Plans (IRPs) for the two major utilities in Connecticut and the Connecticut Department of Energy and Environmental Protection (DEEP). These projects relied on an integrated modeling system that simulated the New England locational energy market (with DAYZER), the Forward Capacity Market, REC markets, and competitive suppliers’ likely investment/retirement decisions. The studies addressed electricity supply risks, natural gas supply into New England, RPS standards, environmental regulations, transmission planning, emerging technologies, and energy security. Brattle experts provided oral testimony before the DEEP and solicited input from stakeholders.