This report includes legislative and regulatory background for states in which an energy efficiency resource standard (EERS) has been in place for over two years and examines the progress that these states have made in achieving their goals. The report finds that states' abilities to meet energy savings targets are driven by issues such as the clarity and appropriateness of the regulatory framework, the length of time allowed for program administrators to ramp up programs and the overall commitment of all parties to invest the proper resources to meet targets. States must overcome these barriers to successfully meet EERS targets and should carefully consider such issues during the policymaking process.