For example, «During the six months ended June 30, 2016, OPG lost 3.4 TWh of
hydroelectric generation due to SBG [surplus baseload generation] conditions, compared to 1.5 TWh during the same period in 2015.»
Due to a combination of increasing solar and high
hydroelectric generation due to an exceptionally rainy winter, California is expected to curtail a record 6 - 8 GW of renewable energy this spring.