Yesterday, solar and energy storage advocates had their second win in less than 24 hours. Following on the dramatic and narrow passage of a bill to mandate 100% carbon-free electricity by 2045, another bill which may contain one of the keys to making that happen has passed the Assembly.
SB 700 will extend the state’s Self Generation Incentive Program (SGIP) through 2026, which by the estimates of the California Solar and Storage Association (CALSSA) will support the installation of nearly 3 GW of behind-the-meter storage.
A very large volume of energy storage will likely be necessary for California to achieve the very high penetrations of wind and solar that will come online as the state approaches 100% clean electricity, a fact which was not lost on the bill’s sponsor.
“If we are going to get to 100% clean energy, we need to be using solar power every hour of the day, not just when the sun is shining,” stated California Senator Scott Wiener (D-San Francisco), the author of SB 700.
However, SB 700 is critical for another reason: it may enable the state’s residential solar industry to survive. As part of the move to net metering 2.0, new residential installations in the state are subject to time-of-use rates. Not only does this add greater complexity to the sales process, but with solar driving down mid-day demand, increasingly the most highly priced hours are after the sun sets.
Increasingly, the solution to this is energy storage, as the addition of batteries allows residential solar customers to store electricity from their PV systems during the day and either use it or export it to the grid during peak evening demand.
However, energy storage systems are expensive, as adding batteries typically doubles the cost of a residential PV system. That’s where SGIP comes in, by providing incentives that can help to put solar plus storage within the reach of more consumers.
The current version of SGIP allows state regulators to collect up to $166 million per year from the state’s three large investor-owned utilities to fund SGIP; however the program was set to expire at the end of 2019. SB 700 will add another five years and up to $800 million in funding for the program.
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