Distributed energy resources (DER) have been available for many years. They may have been known by different names such as generators, back-up generators, or on-site power systems, and certain DER technologies are not new (e.g., internal combustion engines and combustion turbines). On the other hand, due to the changes in the utility industry, several new technologies are being developed or advanced toward commercialization (e.g., fuel cells and microturbines).

This section of the California Distributed Energy Resources Guide provides information regarding commercially available DER Equipment as well as those technologies still undergoing development. Some of the technologies are listed in both categories because they are currently commercially available but are also undergoing a significant level of further research and development. Select the links below for detailed information regarding the technologies.