This case has been dragging on for nearly 5 years. When it first started, ratepayers in PJM's Illinois territory were looking at sharing a huge chunk of the cost of PJM's multi-billion dollar Project Mountaineer collection of unneeded transmission projects. Although the bill has shrunk considerably with the cancellation of PATH and MAPP, the argument has only grown.
It centers on PJM's 2006 adoption of the "postage stamp" cost allocation methodology. This method assigned costs of new transmission 500kV or greater to all ratepayers in the region based on their share of regional electricity sales. The more power an area used, the greater its share. PJM did this to spread out (socialize) the cost of its Project Mountaineer venture over more customers so it could get that transmission built before the hoi polloi noticed, "before it became common dinner table talk."
However, it's important to realize that PJM no longer uses the 100% "postage stamp" cost allocation method and hasn't since last year. Today's 7th Circuit decision will have no effect on any proposed or future transmission projects in PJM, or any other RTO. Today's decision will only affect those projects that were built (or not!) before last year's new allocation method went into effect. PJM's new, FERC-approved cost allocation methodology relies on a 50-50 split of two different methods for transmission lines of at least double-circuited 345kV or greater. The first 50% is allocated according to the old postage stamp method, and the remaining 50% is allocated either to the cost causers or the beneficiaries, depending on the reason for the project. Costs for transmission projects based on "public policy" clean energy state laws will be allocated to the states that require them under PJM's "State Agreement Approach." If a state doesn't agree to shoulder the cost burden for a project designed to meet its renewable portfolio standard, then it will not be built.
Today's decision echoed the first remand from the 7th Circuit, that found that FERC had not done enough to show that utilities in "western PJM" received benefit from Project Mountaineer that was commensurate with their cost responsibility under the old "postage stamp" allocation method.
FERC dealt with the first remand by rolling its eyes and making up more crap about how "western PJM" benefited from Project Mountaineer. It pulled an even bigger diva act on rehearing. But FERC just can't out-diva Judge Posner of the 7th Circuit.
Posner hates coal, and transmission lines that carry it. But, he loves postage stamp rates for transmission lines that are supposed to be "for wind."
This Sybil act must also be confusing to FERC, but hopefully they can get it right this time... because third time's a charm, right?
Go ahead, read today's decision. It's quite chatty and reads like some guy's geeky blog post about electricity and cost-benefit analyses, until you get to the 9-page dissent by Judge Cudahy, who seems to be writing from the other side of the political spectrum. It's fairly entertaining. However, I suspect FERC is not as amused as you are.