According to the latest data from CPUC, renewable energy usage in California has reached 28,844 GWh since 2002, but only around 1,300 GWh of that comes from new renewable sources. However, the installed capacity of projects that have been approved or are currently under development stands at a much higher 30,505 GWh. Among these, solar photovoltaics account for about 10,300 GWh, while solar thermal power is estimated at 17,100 GWh.
The actual installed capacity is influenced by market dynamics. While solar PV has seen some progress, the development of solar thermal projects has lagged behind. There's a noticeable shift towards photovoltaic systems, and even major players in the solar thermal sector have delayed their initial public offerings (IPOs). Companies are waiting to see if the world’s largest solar thermal project, Ivanpah, can deliver on its promises before making further investments.
The large-scale integration of renewable energy requires additional transmission infrastructure. To address this, California launched the Renewable Energy Transmission Initiative (RETI), which evaluates the feasibility of renewable energy deployment and grid expansion across 30 districts. The initiative is currently identifying priority areas and planning new transmission lines. The California Independent System Operator (CAISO) regularly revises its transmission plans each year to ensure grid reliability and support the growth of renewables.
In Japan, where renewable energy adoption is also a priority, California’s transparent transmission planning model could serve as a useful example. However, the U.S. still faces significant challenges in securing landowner approvals and managing the cost distribution during transmission line construction—issues that have slowed progress.
Another emerging trend is the re-evaluation of decentralized power generation. In March, CPUC released a report on distributed solar power, calculating the potential of localized solar systems without the need for new transmission lines. Currently, if a decentralized source exceeds 15% of a substation’s peak demand, a detailed grid connection review is required, which acts as a barrier for many companies looking to enter the market.
The report suggests that if current regulations were relaxed to a level similar to “no power backflow,†the maximum capacity of decentralized energy sources could rise from 7,000 MW to 15,000 MW. Although there are technical hurdles, the flexibility of grid connection rules plays a critical role in determining how much distributed energy can be integrated. This issue is now receiving increasing attention from regulators and industry stakeholders alike.Decoration for Cornice Mouldings:
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