This is the third of a 5 part series examining California’s energy markets. The second provides an overview of renewable energy.
California has reached a significant milestone in its journey towards clean energy. Consistently, the state has enough generation capacity to entirely surpass consumer demand. This achievement, fueled by a robust solar, wind, and hydropower portfolio, serves as a testament to California’s unwavering commitment to a sustainable future. However, a critical challenge still stands in the way of achieving a fully carbon-free grid – storing the excess energy generated during the day for use at night.
While surpassing demand is undeniably impressive, it’s important to recognize that this wasn’t a 24/7 feat. Unlike fossil fuels, solar panels cease generating power once the sun sets. This is where California’s current Achilles’ heel lies – limited large-scale energy storage capacity. To maintain grid stability during these non-sunshine hours, natural gas plants are still required to pick up the slack.
Recognizing this limitation, California is actively working on a solution. Large-scale battery storage projects are rapidly taking root across the state. These projects aim to capture the surplus solar energy produced during the day and then strategically release it back into the grid when needed, particularly during peak evening hours. This shift would significantly reduce reliance on natural gas, pushing California closer to its clean energy goals.
The California energy market is separated into 3 distinct, yet interconnected markets. The Day-Ahead, the Hour Ahead (15 minutes), and the Real Time (5 minutes) market. The Real Time market is only active during emergencies or generator failures. CAISO, California’s energy grid regulated by the California Public Utilities Commission, awards generation rights mostly in the day ahead market. This locks up forecasted demand, and closes that market on the day of. CAISO then makes minute adjustments awarding generation rights on a hour by hour basis, also known as the open market. This market paradigm was but in place after the Enron scandal and has maintained relative stability.
The Day Ahead market generally indicates forecast, and the Hour Ahead indicates volatility from the forecasted demand. Ideally the Day Ahead market is where most energy is traded and, often priced slightly higher as there is an economic incentive to hedge and lock in stability. Some traders can game this system by forecasting better than the state. Using energy storage, traders buy on the open market at one time (hour ahead) and then sell at another. The goal of CAISO is to stabilize energy generation. As our energy grid continues to develop, the margins for trading energy will decrease. Perfect parity will never be achieved, but we are inching step by step to a logarithmic plateau. Despite, the current system is designed to allow flexibility utilizing the laws of economics to provide consistent energy, at somewhat marginal volatilities.
Experts believe that by continuing to invest in both renewable energy generation and large-scale storage solutions, California can achieve a near carbon-free grid. However, completely eliminating fossil fuels might require significant advancements in storage technology. Imagine batteries that can hold excess energy for days, not just hours, ensuring a reliable safety net even during prolonged stretches of cloudy weather or low wind. Additionally, the pace of renewable energy development needs to accelerate significantly. Studies suggest that California might still need natural gas in 2045, even with its ambitious clean energy goals, if solar and wind projects aren’t built at a much faster rate.
California’s recent achievement serves as a beacon of hope, showcasing the immense potential of renewable energy. However, it also underscores the critical role of storage in realizing a truly carbon-free future. By prioritizing large-scale battery projects and fostering innovation in storage technology, California can pave the way for a clean energy future, not just for itself, but for the nation as a whole.