In its latest effort to put to rest the years-long controversy that has swirled around its efforts to address excessive electricity production during periods when high winds coincide with high water in the Columbia River system, the Bonneville Power Administration ("BPA") recently issued a draft Record of Decision ("ROD") allocating the costs of such events. While wind generators argued for allocating all such costs to BPA's power customers and BPA's power customers urged BPA to assign all such costs to its transmission customers, BPA chose a third path. In the recent draft ROD, issued by newly-minted BPA Administrator Elliot Mainzer, BPA concluded that it should allocate oversupply costs to those generators operating within its balancing authority area that have scheduled power during an oversupply event. BPA's chosen alternative was supported by only one out-of-region entity, so it is unlikely to end either the controversy or the protracted litigation that has resulted.
As we have previously reported, the oversupply problem is an unintended consequence of the rapid expansion of wind generation in the Pacific Northwest. The wind fleet's capacity in the region now exceeds 7,000 MW, with 4,500 operating in BPA's balancing authority area. The oversupply problem arises when strong spring winds coincide with high spring runoff in the Columbia River Basin. In this situation, the combined electric power produced by federal dams on the Columbia River and wind generators in the region can exceed electrical loads. Further, the obligation to maintain dissolved gases within limits set by environmental authorities in order to avoided gas bubble trauma in fish (especially endangered salmon and steelhead runs), limits the amount of water dam operators can release over spillways, which adds to dissolved gas loads, requiring them instead to run the water through generators.