Net Metering Explained (and What NEM 3.0 Changed)

If you have solar panels or are thinking about them, net metering is one of the most important factors in how much you save. It decides what your utility pays you for the extra electricity your system sends back to the grid. The rules have been changing fast, and California's NEM 3.0 is the clearest example of a shift that is spreading to other states. Here is what net metering is, how it works, and why a home battery matters more than ever.

What Is Net Metering?

Solar panels often produce more electricity than your home uses during sunny hours. Net metering is a billing policy that lets you send that surplus power to the grid and receive a credit on your bill. Later, when your panels are not producing enough, such as at night, you pull power back from the grid and use those credits to offset the cost.

Think of the grid as a kind of bank. During the day you deposit extra energy; at night you withdraw it. Your utility measures the net difference, which is where the name comes from. The key question is how much each unit of exported energy is worth.

Full-Retail vs. Reduced Export Credits

Under traditional net metering, exported power was credited at the full retail rate, the same price you pay to buy electricity. This was very favorable. One kilowatt-hour you sent to the grid canceled out one kilowatt-hour you bought later, dollar for dollar.

Newer policies pay much less. Instead of the full retail rate, they credit exports at a lower "avoided cost" or wholesale-style value that reflects what the utility would have paid to generate the power itself. Under these rules, the energy you export is often worth far less than the energy you buy, sometimes only a fraction. This gap is the heart of what changed.

What NEM 3.0 Changed in California

California moved from earlier full-retail net metering to a new structure often called NEM 3.0, or the Net Billing Tariff. The biggest change was a sharp reduction in the value of exported electricity. Under the new rules, credits for power sent to the grid dropped substantially compared with the old system.

The policy also ties export values to the time of day. Power exported during the middle of the day, when solar is abundant and demand is lower, earns relatively little. Power available in the early evening, when demand is high and the sun is setting, is worth more. This time-based pricing rewards homeowners who can shift when they use or export energy.

The result is that simply exporting midday solar no longer pays what it used to. To get strong value from a system under NEM 3.0, homeowners are encouraged to use more of their own solar directly rather than selling it cheaply to the grid.

Why These Changes Are Spreading

California is not alone. As rooftop solar has grown, many utilities and regulators across the country have moved to reduce export credits. Their reasoning is that full-retail net metering shifts grid maintenance costs onto customers without solar and pays solar owners more than the exported power is worth to the utility.

Whether or not you agree with that reasoning, the trend is clear: the era of guaranteed full-retail export credits is fading in many areas. If you are planning a solar system, you should assume export values may be lower than they were a few years ago, and you should confirm the current policy with your own utility.

What This Means for Solar Economics

When exports are worth much less than the power you buy, the math changes. Every kilowatt-hour of solar you use yourself is worth the full retail price you avoid paying. But every kilowatt-hour you export for a low credit is worth much less. So the goal shifts from exporting as much as possible to self-consuming as much as possible.

This is called increasing your self-consumption. The more of your own solar you use in real time, or store for later, the more value you capture. Under reduced export rules, self-consumption is where the savings live.

Why a Home Battery Now Matters More

This is exactly where a home battery like the Tesla Powerwall becomes valuable. Instead of exporting your midday solar surplus for a small credit, a battery stores it. Then you use that stored energy in the evening, when grid electricity is most expensive and export credits would have been lowest anyway.

In other words, a battery lets you keep and use your own solar rather than selling it cheaply and buying it back at full price. Batteries also provide backup power during outages and help you take advantage of time-based rates by drawing stored energy during peak-price hours. Under policies like NEM 3.0, pairing solar with storage often makes far more financial sense than solar alone.

How Charge Home Solutions Can Help

Charge Home Solutions is a Tesla Energy Certified and SPAN Certified electrical company. We do not install solar panels ourselves, but we specialize in the parts that make solar work harder for you: Tesla Powerwall battery installation, EV chargers, and panel upgrades that make your home solar-ready. As export credits shrink, storing and using your own energy is the smart move, and that is our expertise. Call 888-995-6044 for a free consultation. Net metering rules vary widely and change often, so always confirm the current policy with your local utility.