Energy efficiency, which provides numerous benefits to the utility system, participants, and society, is the lowest-cost resource. In the United States, non-end-use benefits alone can justify the entire cost of an energy efficiency program. In speaking to stakeholders in a potential energy efficiency resource standard (EERS) process in New Hampshire, David Littell presented examples of highly-successful EERS programs around the world. He explores the objectives, goals, and challenges of the programs, as well as administrative and framework considerations for regulators exploring EERS. Properly implemented, EERS can reduce energy use, customer costs, and peak transmission loads, while also creating jobs, encouraging a shift to clean in-state resources, and reducing emissions for credit under the United States Environmental Protection Agency’s Clean Power Plan. The cleanest kilowatt is the kilowatt saved.