It Was Denied Here Before: The Valley-Rainbow Powerline

In 2001, SDG&E asked the California Public Utilities Commission for permission to build the Valley-Rainbow Interconnect — a roughly $271 million, ~31-mile, 500 kV line running from Southern California Edison's Valley Substation, near Romoland, to a new substation at Rainbow, crossing southwest Riverside County. One of the routes it proposed ran straight through the heart of the Pechanga's Great Oak Ranch. ^{[1] [2]}

In December 2002, the Commission denied it. Decision D.02-12-066 refused SDG&E a Certificate of Public Convenience and Necessity — the permit a utility must have before it can build a line of this size. This was not a reroute, as happened later with the Sunrise Powerlink. The project was stopped. ^[3]

The reason the Commission gave goes to the center of today's fight. The CPUC looked at whether SDG&E had shown the line was actually needed within a reasonable planning horizon — and found it had not. It sided with the state's ratepayer advocates and the local community over both SDG&E and the California grid operator (the ISO). ^[3]

That last point matters now. SDG&E argues the Golden Pacific Powerlink is justified because the grid operator identified a need for it. Valley-Rainbow is the proof that the grid operator's word is not the last word: the Commission can, and did, independently weigh the need and say no. ^[3]

The Commission also gave a second, independent reason. Setting need aside, it found the line was simply not cost-effective for the ratepayers who would pay for it — the benefits were too small for the cost, and most of those benefits came from new power plants, not from the wire. Either finding alone was enough to deny the project. ^[3]

Valley-Rainbow was not beaten by public comment alone. It was beaten on the evidentiary record, by formal parties who put expert testimony in front of the Commission and took SDG&E's case apart. The same playbook is available today. ^{[3] [4]}

Become a party, not just a commenter. Save Southwest Riverside County and the state's ratepayer advocates intervened formally — filing testimony, cross-examining SDG&E's witnesses, and briefing the law. That standing is what let them shape the outcome, and the Commission later awarded the community group its costs. A city can seek the same party status once SDG&E files its application. ^[4]

Win it on the numbers. The denial turned on load forecasts, available power supplies, and cost-benefit math — not scenery. The “need” collapsed once intervenors showed SDG&E had left available resources out of its forecast, making a shortage appear where the evidence didn't support one. ^[3]

Insist every alternative is studied. The Commission faulted SDG&E because it “only looked at transmission alternatives.” The review should be made to weigh generation, storage, demand response, and upgrading existing lines before approving a new corridor. ^[3]

Don't treat the grid operator's word as final. The Commission weighed the need itself and reached the opposite conclusion from the California grid operator. Regulators can say no even when the ISO says yes — and here, they did. ^[3]

The denial did not happen on its own. A community group, Save Southwest Riverside County, became a formal party in the case and put the need question on the record — the Commission later awarded it compensation for the difference it made. ^[4] The Pechanga Band, whose Great Oak Ranch and the roughly 2,000-year-old sacred oak Wi'áaşal sat in one proposed path, fought the line and moved to protect the land. ^{[5] [6]}

Read the history honestly: it was the CPUC's 2002 decision, on need, that stopped the project — the tribal land was placed into federal trust afterward, in 2003. The lesson is not that any single move was decisive, but that an organized community, a tribe with land in the path, and ratepayer advocates together built a record the regulator could not approve. ^{[3] [5]}

The headline is simple and true: the state has already denied an SDG&E 500 kV line in this exact corridor — and it did so because the company could not prove the line was needed. The way to meet the Golden Pacific Powerlink is the way Valley-Rainbow was met: demand that the review test the real need and the alternatives, and put that case on the record before the Commission.