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Nathalie Voisin, chief scientist for water-energy dynamics at the Pacific Northwest National Laboratory, said much of the latest research suggests an increase in total annual hydroelectric power in the region, but, as Turner noted as well, uncertainties remain. “So as a trend, we see an increase” in annual precipitation, Voisin said, “but we also see an increase in variability of very wet years and very dry years.
— around half of which is supplied by Bonneville Power. But with its standard fleet of hydroelectric plants generating below average, Siobhan Doherty, the utility’s director of power management, said it has had to procure new sources of energy to ensure it can comfortably meet customers’ needs. A fair portion of that power comes from other dams in the area, but some of it is also provided by what Doherty called “unspecified” sources purchased from other providers.
Nonetheless, in a bid to keep its grid carbon-free in the long term, Seattle City Light recently signed agreements to buy energy from two independent solar projects, each with at least 40 megawatts of capacity, and is negotiating other, similar arrangements. The fact Bonneville Power has seen a sharp rise in requests from renewable energy developers to connect to its transmission lines suggests other utilities in the region are exploring similar deals.
That experience, and the many more like it that are sure to come, suggest that even as year-to-year dips impact the nation’s dams, the power they provide will long remain a critical component of a carbon-free future.