Large Generator Interconnection (LGI)

Grand Coulee Dam

A Large Generating Facility, i.e., a device that produces electricity or stores electricity for later injection, with a capacity of more than 20 MW is interconnected to the Federal Columbia River Transmission System (FCRTS) under Attachment L of BPA's Open Access Transmission Tariff (OATT).

BPA's Transition to Cluster Study Procedures (Attachment R of BPA's OATT)

As of June 30, 2024, tariff reforms took effect outlining a transition from a serial interconnection process to a clustered study process for the interconnection of Large Generating Facilities. Transition Requests are now being studied in the Transition Process under Attachment R of BPA’s OATT. For more info, see the Transition Process Business Practice.

Cluster Study Procedures (Attachment L of BPA’s OATT)

After the Transition Cluster Study is complete BPA will begin the first post-transition Cluster Study. After the transition, new Interconnection Requests for Large Generating Facilities will be studied in the standard Cluster Study procedures outlined in Attachment L of BPA’s OATT. For more info, see the Large Generator Interconnection Business Practice.

Surplus, Repower or Replacement

Surplus Interconnection Service Requests, Repower Requests, or Replacement Requests have distinct procedures outlined in Attachment L of BPA’s OATT.