Tesla expects massive savings for Powerwall owners in California following net metering change
Tesla is expecting its Powerwall to become an even bigger difference maker for homeowners with solar in California following a net metering change.
California changed its net metering rules starting this week. The new Net Billing Tariff (NBT), sometimes referred to as NEM 3.0, is now the new solar billing policy, and it basically results in removing the model of getting credited for sending energy back into the grid at the import price.
Instead, now solar power system owners are getting credit for sending energy into the grid at the value of the avoided cost to the utility, which is similar to the wholesale cost of a large power plant.
This results in a significant drop in the value of the energy an individual can send back to the grid most of the time, except for a few exceptions – especially in September in the evening.
Tesla informed customers of those changes and believes that it significantly increased the value of batteries combined with solar, like Powerwall, for those reasons:
- Using more solar allows customers to save more: Adding Powerwall allows you to store solar energy and use it later, instead of exporting it to the grid for minimal credit. A solar-only system will reduce the median customer’s electricity bill by 57%; with Powerwall, the bill will go down by 92%.*
- Earn more during “Power Hours”: Powerwall’s intelligent, customizable software allows you to take advantage of the “Power Hours” in September when credits are 75x higher than the lowest export prices during the month.
For example, with PG&E, those “Power Hours” result in a rate of $2.87 per kWh at 19h00 on September evenings:
It means that someone with a single Powerwall could make hundreds of dollars just by sending back a few kWh every evening during September. There are a few more times throughout the year when it’s also going to be worth it to send back energy with Powerwall, but the rest of the time, most of the value will be in the Powerwall allowing homeowners to use more of their own solar.
For those reasons, Tesla now says that it will provide Powerwall with all its own solar installations in California.
Tesla also works with other solar installers in the state to provide its home battery pack.
The company is predicting that solar plus Powerwall could result in 92% savings on the electric bill of an average home owner during the first year:
Over 10 years, which is the period of a Powerwall warranty, it could result in as much as $15,000 in savings, which is about the price of a Powerwall installation. Therefore, it basically pays for itself while also providing backup power capabilities and most likely still offering value after those 10 years.
If you want to make sure you’re finding a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage. EnergySage is a free service that makes it easy for you to go solar – whether you’re a homeowner or renter. They have hundreds of vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20 to 30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
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![Day 1 of the Electrek Formula Sun Grand Prix 2025 [Gallery]](https://i0.wp.com/electrek.co/wp-content/uploads/sites/3/2025/07/54629423281_6315c46dff_k.jpg?resize=1200,628&quality=82&strip=all&ssl=1)
Today was the official start of racing at the Electrek Formula Sun Grand Prix 2025! There was a tremendous energy (and heat) on the ground at NCM Motorsports Park as nearly a dozen teams took to the track. Currently, as of writing, Stanford is ranked #1 in the SOV (Single-Occupant Vehicle) class with 68 registered laps. However, the fastest lap so far belongs to UC Berkeley, which clocked a 4:45 on the 3.15-mile track. That’s an average speed of just under 40 mph on nothing but solar energy. Not bad!
In the MOV (Multi-Occupant Vehicle) class, Polytechnique Montréal is narrowly ahead of Appalachian State by just 4 laps. At last year’s formula sun race, Polytechnique Montréal took first place overall in this class, and the team hopes to repeat that success. It’s still too early for prediction though, and anything can happen between now and the final day of racing on Saturday.
Congrats to the teams that made it on track today. We look forward to seeing even more out there tomorrow. In the meantime, here are some shots from today via the event’s wonderful photographer Cora Kennedy.
Stay tuned for more!
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The numbers are in and they are all bad for Tesla fans – the company sold just 5,000 Cybertruck models in Q4 of 2025, and built some 30% more “other” vehicles than it delivered. It just gets worse and worse, on today’s tension-building episode of Quick Charge!
We’ve also got day 1 coverage of the 2025 Electrek Formula Sun Grand Prix, reports that the Tesla Optimus program is in chaos after its chief engineer jumps ship, and a look ahead at the fresh new Hyundai IONIQ 2 set to bow early next year, thanks to some battery specs from the Kia EV2.
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If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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Tesla has launched its new Oasis Supercharger, the long-promised EV charging station of the future, with a solar farm and off-grid batteries.
Early in the deployment of the Supercharger network, Tesla promised to add solar arrays and batteries to the Supercharger stations, and CEO Elon Musk even said that most stations would be able to operate off-grid.
While Tesla did add solar and batteries to a few stations, the vast majority of them don’t have their own power system or have only minimal solar canopies.
Back in 2016, I asked Musk about this, and he said that it would now happen as Tesla had the “pieces now in place” with Supercharger V3, Powerpack V2, and SolarCity:
All of these pieces have been in place for years, and Tesla has now discontinued the Powerpack in favor of the Megapack. The Supercharger network is also transitioning to V4 stations.
Yet, solar and battery deployment haven’t accelerated much in the decade since Musk made that comment, but it is finally happening.
Last year, Tesla announced a new project called ‘Oasis’, which consists of a new model Supercharger station with a solar farm and battery storage enabling off-grid operations in Lost Hills, California.
Tesla has now unveiled the project and turned on most of the Supercharger stalls:
The project consists of 168 chargers, with half of them currently operational, making it one of the largest Supercharger stations in the world. However, that’s not even the most notable aspect of it.
The station is equipped with 11 MW of ground-mounted solar panels and canopies, spanning 30 acres of land, and 10 Tesla Megapacks with a total energy storage capacity of 39 MWh.
It can be operated off-grid, which is the case right now, according to Tesla.
With off-grid operations, Tesla was about to bring 84 stalls online just in time for the Fourth of July travel weekend. The rest of the stalls and a lounge are going to open later this year.
Electrek’s Take
This is awesome. A bit late, but awesome. This is what charging stations should be like: fully powered by renewable energy.
Unfortunately, it will be much harder to open those stations in the future due to legislation that Trump and the Republican Party have just passed, which removes incentives for solar and energy storage, adds taxes on them, and removes incentives to build batteries – all things that have helped Tesla considerably over the last few years.
The US is likely going to have a few tough years for EV adoption and renewable energy deployment.
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