This report is prepared in response to Assembly Bill (AB) 578 (Blakeslee, 2008) which specifically requires the California Public Utilities (CPUC) to submit to the legislature a report on the impacts of distributed energy generation on California's transmission and distribution (T&D) systems.
This report provides an overview of the current status of California's distributed energy generation resources and highlights some of the current challenges and activities around interconnecting these resources to the utility grid.
The CPUC has oversight of policies and programs related to distributed generation (DG) resources in California's investor owned utility (IOU) territories. Since the 1980s, the use of DG resources has increased dramatically in California due to policies related to interconnection, net energy metering, and procurement, as well as programs related to advancing the integration of clean, DG resources, such as the California Solar Initative (CSI) and the Self-Generation Incentive Program (SGIP).
Compared to the rest of the Untied States, California has a significant amount of DG installed on the grid, particularly solar. The report indicates that as yet there are no noticeable impacts on the distribution and transmission infrastructures, mased on performed strudies. However, with the continued expected growth of DG, there are opportunities to develop consistent interconnection policies and to evaluate the penetration of DG on distribution feeders and DG's continued contributions to reducing peak demand through existing technology and technologies in the infancy.
The full report and relatedd documents can be downloaded here.