The study also concluded that wind and solar power can offset each other’s output since wind is frequently plentiful at night and solar power is best generated on hot, sunny afternoons; that efficiencies can be gained with more participation in the ISO’s new market; and that flexibility is critical important which allows the ISO greater dispatch flexibility for meeting real time needs of the grid. In addition, new operational tools for ISO dispatchers are needed to be prepared for fluctuations in generation.
Keith Casey, Vice President of Market and Infrastructure Development says, “This study provides a thorough analysis of the capability of the power grid to effectively manage an oncoming wave of highly intermittent energy resources and confirms the ISO is ready to manage the grid reliably under 20 percent RPS. However, the study also affirms the critical role the ISO market and the existing fleet of conventional resources will need to play in balancing the variable output of renewables.”
The California ISO is a nonprofit public benefit corporation that operates the state’s wholesale transmission grid, providing open access supported by a competitive energy market and comprehensive planning efforts. The ISO bulk power market allocates space on transmission lines, maintains operating reserves and matches supply with demand.
The study is available at http://www.caiso.com/2804/2804d036401f0.pdf