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Columbia River Operations Summary Fall 2020

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Pend d’Oreille Reservoir. Photo by Fabio Moscatelli. Columbia River Operations Summary Fall 2020 This publication provides an overview of BC Hydro’s operations on the Columbia River. At 2,000 kilometres long, the Columbia River is the fourth largest river in North America. The headwaters of the Columbia River are in Canal Flats, British Columbia (B.C.). The river then flows northwest Canada through the Rocky Mountain trench before heading south through B.C. and Washington, emptying into the Pacific Vancouver Ocean at Astoria, Oregon. Other major tributaries of the Columbia River in Canada include the Kootenay and Pend U.S. d’Oreille rivers. Seattle Only 15% of the Columbia River basin lies in Canada. The Montana Canadian portion of the basin is mountainous and receives a Washington lot of snow producing, on average, 30 to 35% of the runoff for Canada and the United States (U.S.) combined. The river’s large annual discharge and relatively steep gradient Idaho gives it tremendous potential for the generation of Oregon electricity. The hydroelectric dams on the Columbia’s main stem and many more on its tributaries produce more hydroelectric power than on any other North American river. BC Hydro’s facilities in the Columbia basin include 13 hydroelectric dams, two water storage dams, and a system of reservoirs. Four of the larger reservoirs within Canada are operated according to the Columbia River Treaty and other agreements signed between Canada and the U.S. BCH20-712 Columbia River Operations Update | 1 Columbia River Treaty compensated for energy losses at its Kootenay Canal operations that result from the timing of water releases The Columbia River Treaty between Canada and the United from the Libby Dam. The Entities have also agreed to States was ratified in 1964. The Treaty resulted in the continue working together to reach a long-term agreement. construction of three dams in British Columbia (the Duncan, Hugh L. Keenleyside and Mica dams) for flood control and In late 2019, the Columbia River Treaty Operating to increase hydroelectric generating potential in both Committee signed the 2020 Non-Power Uses Agreement. countries. The Treaty also provided for the construction of This annual operating agreement allowed Arrow Lakes Libby Dam in the United States and the resulting Koocanusa Reservoir releases to be reshaped between January and July Reservoir, which crosses the Canada-U.S. border. 2020 to protect Canadian whitefish in exchange for flow benefits for endangered U.S. salmon. Water stored, and then released, by Canadian reservoirs provides the U.S. with the potential to generate additional NON-TREATY STORAGE AGREEMENT (NTSA) electricity. Under the terms of the Treaty, Canada receives a The Kinbasket Reservoir, created by the Mica Dam, is one-half share of the extra power generation potential in licensed by the Province of BC for more storage than was the U.S. This is called the Canadian Entitlement to required by the terms of the Columbia River Treaty. This Downstream Benefits and is owned by the Province of additional water is called Non-Treaty Storage and the water British Columbia. The Canadian Entitlement varies from year can be released across the Canada-U.S. border only under to year, but is currently about 3,990 gigawatt hours (GWh) agreement between BC Hydro and its U.S. partners. The per year of energy and 1,141 megawatts (MW) of capacity current NTSA was signed by BC Hydro and BPA in 2012 and for the period between August 1, 2019 and July 31, 2020. remains in effect until 2024. The Treaty can be terminated at any time after September The 2012 NTSA gives BC Hydro more control over reservoir 16, 2014, provided that either country provides ten years’ levels, provides more energy benefits to B.C., and gives BC notice of its intent to terminate. After extensive consultation Hydro more operating flexibility to balance competing with basin residents, the Province decided in March 2014 to non-power interests on the Columbia system. These continue with the Columbia River Treaty and to seek interests include recreational activities, wildlife habitat, and improvements within the existing Treaty framework. Canada fisheries. Since the agreement was signed, BC Hydro and and the U.S. started negotiations on modernizing the BPA have made good use of NTSA flexibility to reduce high Columbia River Treaty in the spring of 2018. The negotiating and low-water impacts downstream of Arrow Lakes sessions have been occurring approximately every two Reservoir and to improve power and non-power benefits months, alternating locations between the U.S. and Canada. for both countries. More information on the Treaty and its review process can be found at: engage.gov.bc.ca/columbiarivertreaty/. Other agreements The Treaty Entities (BC Hydro, Bonneville Power Administration (BPA), and the U.S. Army Corps of Engineers) periodically negotiate and sign supplemental operating agreements when there is mutual benefit to modify the water releases specified by the Columbia River Treaty. In September 2013, the Treaty Entities signed an annual agreement to address some of Canada’s concerns about the timing of water releases from the Libby Dam (VarQ operating regime). This agreement was extended to be in effect until August 2021 and is supplemental to the Libby Coordination Agreement (signed in 2000). Under the new agreement, the U.S. has committed to continued coordination with Canada to consider alternative reservoir operations to reduce flood risk in both countries (similar to the extensive collaboration that occurred during the 2012 high water event). In addition, BC Hydro will be Sunflower. Photo by Andrea Linderman. Columbia River Operations Update | 2 Snowpack and runoff Snowpack in the Columbia basin this year was above normal The normal licensed range for Kinbasket Reservoir due to cold and wet conditions for much of the operating is between 754.4 metres (2,475 feet) and 706.96 year. This resulted in above normal runoff forecast of 104% metres (2,319.42 feet) respectively. The reservoir for the entire Columbia basin between April and September can be operated up to two feet above its normal 2020 and 108% of normal for the Canadian portion of the maximum level, if approved by the Comptroller of basin. By comparison, the overall runoff in the Columbia Water Rights. Kinbasket Reservoir provides 7 basin in 2019 was only 87% of normal. million acre feet (MAF) of Treaty storage and 5 MAF of non-Treaty storage. KINBASKET RESERVOIR Kinbasket Reservoir is created by the Mica Dam. Kinbasket Reservoir regulates discharges for both the Mica and Revelstoke Generating Stations as well as for power plants further downstream. Kinbasket Reservoir did not fully refill to its maximum storage level (“full pool”) in 2019 due to below average snowpack and runoff conditions. It reached a maximum level of 752.2 metres (2,454.4 feet) on September 27, 2019, which is 6.27 metres (20.6 feet) below normal full pool. The fall and winter of 2019/20 started relatively dry but quickly turned wetter in December and January and this contributed to significant snow accumulation in the basin. Electricity demand was relatively light in the winter but a late season arctic outbreak in March and prolonged cooler, drier conditions into April resulted in increased demand for Revelstoke dam outlets. Photo by Jen Walker-Larsen. electricity. Significantly more draft occurred as a result in March/April 2020 to meet high electricity demand. The REVELSTOKE RESERVOIR minimum water level reached was 720.12 metres (2,362.6 feet) on April 20, 2020. This water level was about 5.30 Revelstoke Reservoir is created by the Revelstoke Dam. metres (17.4 feet) higher than the minimum level in 2019. Revelstoke Reservoir water levels may fluctuate in response to weather patterns, inflow levels, and electricity demand. From February to August 2020, reservoir inflows were During the spring freshet and winter peak load periods, it is about 110% of average. Due to high inflows and a reduced common to have daily fluctuations of the reservoir within 1.5 demand for electricity due to COVID-19, the reservoir metres (5 feet) of full pool. The reservoir is also periodically refilled to reach a maximum level of 754.44 metres (2,475.2 lowered to below its normal minimum level of 571.5 metres feet) on August 23, 2020. This water level was about 0.2 (1,875 feet) to meet increasing system needs for short-term feet above the normal maximum operating level of 754.4 generating capacity or may fill to near full pool during metres (2,475 feet). This storage of additional water has periods of high reservoir inflows. been approved by the Provincial Comptroller of Water Rights and remains within our Water License limits. Similar During low demand and high inflow periods, water is high water levels were observed in 2012 and 2013 during occasionally released over the Revelstoke dam spillway to high runoff conditions. By comparison, the maximum water maintain minimum flows or to maintain the reservoir water level in 2020 was about 8.29 metres (27.2 feet) higher than level. This year, in addition to generation discharge from the the maximum level in 2019. Revelstoke generating station, BC Hydro also released a controlled spill of water from the reservoir from July 14 to Along with storing additional water, BC Hydro also released July 31, 2020 to manage high inflows and to maintain the a controlled spill of water from the reservoir from August 22 Revelstoke Reservoir water level at or below normal full to 24, 2020 to further manage inflows and reservoir levels. pool. Though this was a relatively larger than normal spills During this operation, water was released through the outlet for minimum flows, Revelstoke dam spillway is designed to works which is designed to safely pass water.
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