In spite of below-normal precipitation across much of the region,June hydroelectric power production in the Pacific Northwest surged versus theyear-ago month even as it came in below historical averages.
Across the region, both June 2015 and June 2016 saw precipitation thatwas well below normal, but parts of Washington and British Columbia saw levelsof precipitation closer to normal this year.
Data from the U.S. Army Corps of Engineers show that total netgeneration at 23 hydroelectric plants across the region was 24.3% above theyear-ago level but 25.9% below the 10-year average as it reached 6.16 millionMWh. That figure is down 16.1% from May.
Year-to-date hydropower production through June totaled 41.43million MWh, up 3.5% versus the year-ago level but down 2.1% from the 10-yearaverage for the period.
In the upper Columbia River Basin, the Grand Coulee Dam, the largest of the region,generated 2.12 million MWh, up 32.5% versus the year-ago month but down 16.0%versus the 10-year average for the period. The Chief Joseph Dam generated 1.13 million MWh, up22% versus June 2015 but down 7.7% versus the 10-year average for the month.
June flows in the lower Columbia River Basin were also higherversus the year-ago period. Located on the Washington-Oregon border, theBonneville Damproduced 267,609 MWh, up 62.1% versus June 2015 but 36.0% lower versus the10-year average for the month. The Dalles Dam, 50 miles downstream, produced 461,909 MWh,up 24.3% from the year-ago month but down 31.8% from the 10-year average forJune.