In previous years, all eyes were on Europe as the leader in the Energy Transition. However, as progress has slowed in Germany and other nations, California re-emerging as a global leader. In 2016 the state met nearly a third of its electricity demand with renewable energy, including 20% with solar, wind, geothermal and other non-hydro resources.
On Saturday, California’s grid operator hit a new record, with renewable energy sources peaking at more than 2/3 of electric demand shortly before 3 PM. This follows on a week of strong wind and solar generation, with solar reaching a record output of 9.87 GW on on Thursday, followed by an all-time wind record of nearly 4.8 GW on Saturday.
Saturday May 13 did not hit a record for raw output in either solar or wind, but a combination of lower weekend demand and strong solar and wind production meant that total renewable energy generation excluding large hydro rose above 14 GW in during the afternoon, and shortly before 3 PM met 67% of all demand.
This included solar PV, which peaked at 8.7 GW ten minutes earlier, as well as concentrating solar power (CSP), which reached 494 MW around noon. The combination of these two resources and wind output pushed net power demand down to roughly 9 GW around 3 PM.
But as California reaches German levels of renewable energy penetrations it is also inheriting problems seen in Germany. Negative power prices are becoming increasingly common in the state, and according to an analysis by UtilityDive dipped below zero an average of twice daily in March.
And while negative prices are a problem for conventional generators, the state’s integration challenges are being felt by renewable energy as well. The state expects between 6 GW and 8 GW of curtailment this spring, largely due to huge volumes of hydro after an extremely wet winter.
Such curtailment was seen on May 13, and peaked at over 1.6 GW at 11 AM. There was still 800 MW of system-wide curtailment at 2 PM. This was mostly classified as “economic” curtailment, meaning that it was cheaper to curtail wind and solar than to switch off certain conventional generation.
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