abbr. Advanced Customer Technology Test for Maximum Energy Efficiency

The ACT2 project was initiated in 1990 by the Pacific Gas and Electric Company. It was the first time that energy efficiency measures (EEMs)—such as advanced technologies for lighting, cooling, and insulation—were used as components of integrated systems. Since most of these EEMs had already been rigorously tested and proven individually, ACT2 focused on the cumulative, energy-related synergistic effects that EEMs can have when used in integrated packages.