The ACT2 Project

Energy efficiency advocates suggest that signifcant energy savings can be achieved in businesses and homes, at costs lower than new supply, by using high-efficiency technologies in integrated packages. The ACT2 (Advanced Customer Technology Test for Maximum Energy Efficiency) project marks the first time that energy efficiency measures (EEMs) -- such as advanced technologies for lighting, cooling, and insulation -- have been used as componets of integrated systems. Since most of these EEMs have already been rigorously tested and proven individually, ACT2 is focusing on the cumulative, energy-related synergistic effects that EEMs can have when used in integrated packages.

Work on ACT2 began in 1990 and continued through 1997 on selected commercial and residential sites, including new construction and retrofit of existing buildings.

Final Project Report

In 1990, Pacific Gas and Electric Company initiated a Research & Development project entitled the Advanced Customer Technology Test for Maximum Energy Efficiency (ACT2) to determine the maximum energy savings achievable in a utility customers' facility using an integrated design approach. The hypothesis was that much more energy can be saved through the synergistic interaction of individual energy efficient measures than would be realized if the measures were implemented individually. For example, a superior building shell and/or glazing will decrease the required size of an air conditioning system such that a smaller, more efficient system can be installed for the same or lower cost than the larger less efficient system. By combining the two energy efficient measures (glazing and a new A/C system), the resulting energy consumption is less than it would be if the measures were evaluated and implemented separately. Seven facilities were selected as part of the project, both new construction and retrofit, residential and commercial, and a minimum of two years of energy monitoring data was collected and analyzed for each site. The evaluations of the sites were completed in 1997. Energy savings ranged from 40% to 50% of baseline energy consumption for the retrofit projects and 50% to 65% of the projected energy consumption for the new construction sites assuming they had been built merely to satisfy California's Title 24 energy standards. This report presents the findings for each site and discusses some of the major lessons learned and market barriers encountered.

ACT2 Contact

For additional information about the ACT2 project, please contact Marlene Vogelsang, 415-973-7206,

The reports are available through the Energy Resource Center online catalog