California is going to need a lot more electricity over the next two decades. The California Energy Commission projects that peak demand on the state's main grid will grow by roughly half by 2045, with a forecast range of 42% to 61%.
That means going from about 46.5 gigawatts today to about 66 to 75 gigawatts. Three things are driving it: electric vehicles, data centers, and homes switching from gas to electric.
Electric vehicles
EVs are expected to be the single largest source of new demand. Every car that moves from gasoline to electric shifts its energy use onto the grid, and a single EV can add more to a household's electricity use than almost any other change.
Timing matters here too. Many drivers plug in as soon as they get home, adding load in the evening when the grid is already busiest. As more of the state's cars go electric, that evening demand grows with them.
Data centers
Data centers, the facilities that run cloud computing and artificial intelligence, are the fastest-changing part of the picture. They draw large amounts of power around the clock, and AI growth has quickly pushed demand estimates up. California regulators have repeatedly revised their data center forecasts upward as new projects are proposed.
A single large data center can use as much electricity as a small city. Even a handful of new facilities add meaningful load to the grid, and utilities must plan generation and transmission to serve them.
All-electric homes
The third driver is building electrification. More homes are replacing gas ranges with induction cooktops, gas water heaters with electric ones, and gas appliances generally with electric versions, and new construction increasingly goes all-electric from the start. Each change moves energy use from the gas line to the electrical grid.
For homeowners, that often means a bigger share of the household's energy budget now runs through the electric meter.
What more demand means for the grid
Meeting that growth requires building a lot: new generation, new transmission lines, upgraded local distribution equipment, and the staff to run and maintain it all. Electricity rates largely pay for that investment, which is one reason PG&E rates in the North Bay have climbed so steeply over the past decade and are expected to keep rising.
Demand growth also concentrates in the evening. Statewide solar production falls off in the late afternoon just as households come home, start cooking, and plug in their cars. That evening peak strains the grid and drives up power costs, which is why time-of-use rates charge more from 4 to 9 p.m. on most PG&E plans. Our post on PG&E's peak hours explains how those windows work.
What North Bay homeowners have already seen
Residential electricity rates in Marin, Sonoma, and Napa have roughly doubled over the past decade. Those increases came before most of the new demand described above has arrived. EV adoption is still early, many data center projects are still in planning, and most homes still have at least some gas appliances. As those changes continue, the investment needed to serve them continues too.
That's why so many North Bay households are looking at their energy differently. The question is less about whether rates will keep moving and more about how much of your home's power you want to depend on the grid for.
What it means for your home
As demand rises and rates follow, producing your own electricity is the most direct way to step outside the trend. Solar panels generate power from your roof for decades, at a known upfront cost rather than one that changes with every rate increase.
Pairing solar with a battery specifically addresses the evening peak. A battery stores the power your panels make during the day and releases it in the evening, so your home runs on its own stored solar during the hours when grid power is most expensive. A Backup Battery also keeps your home running if the grid goes down.
This matters more if your own usage is growing. If you're adding an electric car or replacing gas appliances, size a solar and battery system for where your household is headed so new demand runs on power you produce. Our post on what uses the most electricity in your home is a good place to start planning.
Part of the solution
Every home that generates and stores its own power also takes some pressure off the grid. Rooftop solar adds generation right where it's used, without new transmission lines, and home batteries reduce demand during the evening peak, when the grid needs relief most. As more North Bay homes add solar and storage, they help California meet its growing electricity needs.
Planning ahead
Demand forecasts will change as technology and policy evolve. The underlying direction, more electric cars, more data centers, and more all-electric homes, is well established. Homeowners who produce and store their own power are in a steadier position whatever the details turn out to be.
We design solar and battery storage systems around each home's current usage and where it's headed, and we've been doing it across Marin, Sonoma, and Napa since 1984. We're 100% employee-owned, licensed as a General Contractor (B) and Electrical Contractor (C-10), and one of the first companies in California to obtain the state's C-46 solar license.
Ready to produce and store your own power? Contact SolarCraft or call Sonoma/Napa 707.778.0568 or Marin 415.382.7717.
