New Solar Tariffs Start December 4, 2026: What Southern California Homeowners Should Know
If you are thinking about adding solar panels or a home battery in Southern California, there is a new date worth knowing: December 4, 2026.
New federal trade measures are scheduled to place a 15% tariff and minimum import prices on certain imported polysilicon-based solar products.
That does not mean every residential solar system will suddenly cost 15% more. But it does add another variable to equipment pricing and supply that homeowners should understand before deciding when and how to buy.
But a tariff deadline should never be the only reason you sign a solar contract.
In California in 2026, the bigger questions are still your electricity usage, utility rate plan, system design, battery strategy, equipment, financing structure and how much power you will actually use inside your home instead of exporting to the grid.
What Actually Changed With Solar Tariffs in 2026?
The New Effective Date
The recently announced trade measures are scheduled to take effect December 4, 2026. That creates a real timeline for suppliers and installers that rely on covered imported solar products.
Covered Imports
The action includes a 15% tariff on covered polysilicon-derived imports as part of a broader effort to support domestic semiconductor and solar manufacturing.
Not Just a Tariff
The policy also establishes minimum import prices for parts of the solar supply chain, including polysilicon, wafers, cells and modules.
A 15% Solar Tariff Does NOT Automatically Mean Your Quote Goes Up 15%
This is probably the most important thing to understand.
A complete residential solar project includes far more than imported solar modules. There can also be battery equipment, inverters, racking, electrical equipment, permits, engineering, labor and other project costs.
Equipment origin, inventory already in the United States, supplier contracts and future exemptions can also affect how much of a tariff ultimately shows up in the price a homeowner is quoted.
So if somebody tells you, “Tariffs are 15%, therefore your solar installation will cost exactly 15% more,” that is an oversimplification.
For Southern California Homeowners, the Tariff Is Only Half the Story
Most new residential customers of Southern California Edison and San Diego Gas & Electric no longer enter the older NEM 1.0 or NEM 2.0 programs.
New qualifying systems in California's major investor-owned utility territories have generally been placed on the state's Net Billing Tariff, often called NEM 3.0, since April 15, 2023.
Under Net Billing, the value of electricity you export to the grid can be substantially different from the retail price you pay when you buy electricity from the utility.
That changes the goal of system design.
Instead of simply putting as many panels as possible on the roof and relying on the grid to absorb excess daytime production, homeowners need to think more carefully about self-consumption, time of use and battery storage.
Why Battery Storage Matters More Under California's Current Solar Rules
Use Your Own Solar First
Solar production is most valuable when it directly replaces electricity you otherwise would have purchased from your utility.
Save Excess Energy
A properly designed battery can store excess daytime solar instead of immediately exporting all of that electricity to the grid.
Use Stored Energy Later
Stored solar can then help offset electricity use later in the day when the panels are producing less and utility rates may be more expensive.
Important 2026 Update: The Old 30% Homeowner Tax-Credit Advice Is Outdated
If you have been researching solar online, you will still find plenty of older articles saying homeowners can receive a 30% federal Residential Clean Energy Credit.
Federal law changed in 2025.
According to current IRS guidance, the Section 25D Residential Clean Energy Credit is not available for residential clean-energy expenditures made after December 31, 2025.
Tax situations vary, so homeowners should confirm tax questions with a qualified tax professional rather than relying on a salesperson or an old solar article.
California Solar Advice That Changed
| Common Old Advice | What Homeowners Need to Know in 2026 |
|---|---|
| “You get a 30% federal residential solar credit.” | The homeowner Residential Clean Energy Credit ended for expenditures made after December 31, 2025. |
| “Just send your extra solar back to the utility.” | Under California's current Net Billing structure, exported electricity is valued differently than electricity purchased from the utility, making self-consumption and battery strategy more important. |
| “A 15% tariff means solar prices go up exactly 15%.” | Not necessarily. Equipment is only one part of a complete installed system, and tariff exposure depends on the specific products and supply chain. |
| “Solar alone is always the best system.” | Battery storage deserves serious consideration under California's Net Billing structure, depending on the home's usage pattern and goals. |
Should You Install Solar Before December 4?
You Were Already Planning Solar
If solar already makes financial sense for your home and you are comfortable with the equipment, installer and contract, comparing current pricing before the tariff takes effect may be reasonable.
You Haven't Studied Your Usage Yet
Do not rush. Start with your actual utility bills, consumption pattern, roof, goals and expected future electricity use before deciding what system to buy.
Someone Is Pressuring You
A tariff deadline is not a reason to accept an unclear contract, oversized system, bad financing terms or equipment you do not understand.
My background is a little different from the typical solar salesperson. I came into this business with experience in real estate, and I am also an Army veteran.
I tend to look at solar as a property decision and a long-term financial decision, not simply a panel sale.
What does the homeowner actually use? What problem are we solving? What equipment makes sense? Does battery storage improve the design? What does the contract really cost over time?
Those questions matter more to me than pushing someone into a system because a deadline happens to be approaching.
Before You Sign a Southern California Solar Contract, Ask for These Numbers
My Advice: Don't Buy Solar Because You're Scared of a Tariff
Buy solar because the system makes sense for your home.
The December 4 trade changes are a legitimate factor to consider if you are already planning a project.
But the system still has to be properly designed. The financing still has to make sense. The equipment still has to fit your needs. And in California, the solar-and-battery strategy has to account for the current utility billing rules.
A good solar decision should still look like a good solar decision after the deadline has passed.
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California Solar Tariffs 2026: Frequently Asked Questions
When do the new solar tariffs take effect?
Will solar panels become 15% more expensive?
Does California still have the 30% federal homeowner solar tax credit?
What is NEM 3.0?
Do I need a battery with solar in Southern California?
Should I rush to sign a solar contract before December 4?
Does Markham Energy work throughout Southern California?
Sources & Consumer Resources
California Public Utilities Commission — Customer Generation & Net Billing
California Public Utilities Commission — Solar Consumer Protection Guide
Internal Revenue Service — Residential Clean Energy Credit Termination
Article information is educational and should not be considered tax, legal or financial advice.
Thinking About Solar Before the December Tariff Changes?
Start with your actual electric usage and your property. Markham Energy Consulting can help you compare solar, battery storage, equipment and project options before you decide what makes sense.
With major changes on the horizon for the solar industry in 2025, Southern California homeowners have a unique opportunity—but also a time-sensitive decision to make.
The U.S. government is set to reintroduce solar tariffs on panels imported from Southeast Asia. While the move is intended to boost domestic solar manufacturing, it could also drive up solar installation costs for everyday homeowners once existing inventories are depleted.
So what does this mean if you live in Temecula, Murrieta, Lake Elsinore, Riverside, or anywhere else in Southern California?
Let’s break it down.
What’s Changing with Solar Panel Prices?
The new tariffs will likely increase the cost of imported solar panels, particularly for companies that rely on Southeast Asian suppliers. These panels have historically made up a large portion of the U.S. market due to their affordability and availability.
Right now, however, many solar energy companies, including ours, are working through stockpiles purchased before the announcement. That means there’s a limited window where you can still lock in pre-tariff solar pricing—but once that inventory is gone, future systems may cost significantly more.
Why This Matters for Southern California Homes
Southern California is one of the best places in the country for solar energy. With more than 280 sunny days a year and some of the highest utility rates in the nation, switching to a home solar system can generate thousands in solar savings over time.
Here’s what makes now the ideal time to go solar:
- ✅ Utility rates continue to rise, especially under new time-of-use structures.
- ✅ Solar incentives like the 30% federal tax credit (ITC) are still available.
- ✅ Pre-tariff pricing offers a rare chance to beat the next price increase.
- ✅ Newer solar battery options (like the Tesla Powerwall or Franklin A2) give homeowners even more energy control.
Waiting just a few months could mean paying more for the same system and missing out on better financing terms.
What About Solar Installation Timing?
The good news is that solar installation timelines are still fairly quick in Southern California, especially if you get started before the summer rush. At Markham Energy Consulting, we work with top-tier providers like Powur, Sunrun, and Sunfire Construction to get you qualified, approved, and installed efficiently—with minimal upfront cost.
We also help you compare options between cash, solar loans, and Power Purchase Agreements (PPA), so you can choose what works best for your budget and home value.
Still Not Sure? We Can Help You Decide.
We know solar is a big investment—but it’s also one of the smartest long-term decisions a homeowner can make in Southern California. And right now, with the combination of existing inventory, federal incentives, and rising energy costs, the numbers just make sense.
If you’re unsure whether you’re on a time-of-use plan or if your roof is a good fit, we can check for you. Just send over a recent bill, and we’ll provide a free custom proposal.
Get Ahead of the Tariff – Start Saving Now
At Markham Energy Consulting, we’ve helped dozens of homeowners across the Inland Empire transition to clean, reliable solar power while maximizing their savings.
If you’re ready to take control of your energy, reduce your bills, and lock in pre-tariff pricing, let’s talk.
📞 Call or text Matt directly at (951) 283-1516
📩 Email: matt@markhamenergy.com