Wind energy curtailments in the Bonneville Power Administration area still are possible heading into summer given volatile flows on the Columbia River. The hydropower dams are \u201crunning hard\u201d and at the same time the region has experienced abundant wind, said Rob Hawkins, BPA operations research analyst, June 15. The result is that this spring Bonneville curtailed 20,600 MWh of wind energy production in order to keep its hydropower generators running and avoid spilling water over the tops of dams. Spilling introduces nitrogen from the atmosphere into the water, which can kill fish. Running the water through the turbines doesn\u2019t add nitrogen. As wind power has grown in the region, BPA has had to curtail wind generators the past two springs when water runs high as snow melts. However, wind shutdowns are down from last year, when Bonneville curtailed 97,557 MWh of wind production (Current, Feb. 24, 2012). Bonneville did not have to curtail any wind generators last week and water flows are slowly tapering off, according to Hawkins, though a slight surge is expected toward the end of June. Bonneville officials said they have reduced curtailment due in part to an arrangement with Canada, which is storing more water in its upstream reservoirs to moderate flows on the Columbia. California utilities--hungry for wind energy to meet the state\u2019s 33 percent renewable energy standard--get a bit less than 10 percent of their power from the Pacific Northwest, according to the California Energy Commission.