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Integrating Renewable Energy

Skip Navigation LinksPUC > Energy > Federal and Regional Energy Policy > Transmission Planning and Policy > Integrating Renewable Energy > Large Generator Interconnection Procedure (LGIP) Reform

Large Generator Interconnection Procedure (LGIP) Reform


As mandated by FERC, transmission providers, such as the California Independent System Operator (CAISO), are required to incorporate FERC-approved Large Generator Interconnection Procedures (LGIP) in their Open Access Transmission Tariffs. The LGIP stipulate the procedures and standard agreement for the interconnection of generators larger than 20 megawatts.  These procedures are designed for ISOs, RTOs, and other transmission providers to determine, in an equitable and transparent manner, the physical impacts to the transmission system and the associated investment requirements for interconnecting new large generators to the grid.

The FERC expected the existing LGIP process to support competitive markets. However, this process has been overwhelmed by a large number of potential new generation projects, especially renewable energy projects, seeking interconnection in key energy resource areas that require substantial transmission upgrades.

The increased burden of processing associated technical studies on a per generator basis, as well as the uncertainty in interconnection progress and costs for individual generators, has ultimately impaired California’s ability to both plan transmission and pursue renewable and other energy goals. To address this challenge, the CPUC worked closely with the CAISO and other stakeholders in a high priority process to reform the generator interconnection process to facilitate the efficient and timely processing of interconnection requests and planning transmission to accomodate them. The following filings document CPUC's position and progress on LGIP issues.



Last Modified: 12/30/2008

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