If you live in California and are considering residential solar, you’ve likely heard about NEM 3.0 (also called Net Energy Metering 3.0 or the Solar Billing Plan). The name might not conjure excitement, but the policy change behind it has dramatically reshaped the solar calculus for California homeowners. On April 15, 2023, California switched from NEM 2.0 to NEM 3.0, reducing what solar customers earn for exporting excess power to the grid by approximately 75%. For anyone installed under NEM 2.0, the terms are grandfathered—but that grandfathering window has now closed. As of April 15, 2026, any new solar customer in California gets NEM 3.0 rates for the 20-year contract term. Understanding what NEM 3.0 means, how it differs from the previous policy, and whether solar is still worth it under the new rates is essential before making a $15,000–$30,000 investment.

The short answer: yes, solar is still worth it in California, but the strategy has changed. Under NEM 3.0, battery storage becomes nearly essential for maximizing your return. This article breaks down exactly how NEM 3.0 works, why the California Public Utilities Commission implemented it, and how to evaluate whether solar makes sense for your specific situation in May 2026.

What Is NEM 3.0 (Net Energy Metering 3.0)?

Officially: The “Solar Billing Plan” or Net Billing Tariff

NEM 3.0 is officially called the Net Billing Tariff (NBT) or “Solar Billing Plan.” It’s the tariff structure that all new California solar customers must use if they interconnect to the grid after April 14, 2023. The policy applies to residential solar systems connected to the big three California utilities: Pacific Gas & Electric (PG&E), Southern California Edison (SCE), and San Diego Gas & Electric (SDG&E).

Solar Panels on a House Roof

The mechanism is straightforward but the economics are complex. Under NEM 3.0, when your solar panels produce more electricity than you use, the excess is exported to the grid. Previously (NEM 2.0), you earned a credit at the retail rate—the full rate your utility charges you for electricity (~$0.25–$0.35/kWh in California). Under NEM 3.0, you now earn a credit at the “avoided cost” rate, which is much lower: approximately $0.02–$0.08/kWh depending on the time of day and season. This represents a roughly 75% reduction in what you earn from grid exports.

NEM 2.0 vs. NEM 3.0: What Changed

Retail Rate Credits vs. Avoided Cost Credits

Under NEM 2.0 (in effect from 2016–April 2023):

  • You earned 1-to-1 credits at the retail rate (what you pay for electricity) for excess solar
  • Retail rate in California averaged $0.27–$0.35/kWh depending on utility and usage tier
  • If your system produced 10 kWh on a sunny day and you used 6 kWh, the remaining 4 kWh earned credits at the full retail rate
  • These credits offset future bills almost dollar-for-dollar

Under NEM 3.0 (April 2023–present):

  • You earn credits at the “avoided cost” rate for excess solar
  • Avoided cost (the value the utility saves by not buying grid power) averages $0.02–$0.08/kWh
  • The same 4 kWh of excess exports might earn only $0.08–$0.32 in credits instead of $1.08–$1.40
  • This represents a 75% reduction in export value

Why the California PUC Made This Change

The California Public Utilities Commission (PUC) implemented NEM 3.0 for several reasons:

Grid costs: California’s grid is increasingly strained. During peak evening hours (5–9pm), when solar production has stopped but electricity demand is highest, the grid must rely on expensive imports or fast-ramping natural gas plants. The PUC argued that NEM 2.0 shifted these grid costs to non-solar customers, who saw rising rates to compensate for solar export credits.

Equity: Wealthy homeowners could afford solar and earned subsidies (in the form of high export credits) paid for by lower-income renters and apartment dwellers who couldn’t install solar. The PUC viewed NEM 3.0 as more equitable.

Long-term sustainability: At NEM 2.0 rates, solar becomes increasingly profitable for utilities to discourage as penetration grows. The PUC wanted a policy sustainable at 50%+ solar penetration.

Whether you agree with these rationales or not, the policy is now law and has been upheld by California courts. Understanding how to navigate it is essential.

The Grandfathering Window: Now Closed

April 15, 2023–April 15, 2026: The Three-Year Window

When the California PUC announced NEM 3.0 in December 2022, they created a critical grandfathering rule: any solar customer who applied for interconnection by April 14, 2023 could keep NEM 2.0 rates for 20 years. However, they also had to physically connect (install and complete inspection) by April 15, 2026—exactly three years later.

Solar Panels on a Red Roof

This deadline has now passed. Today is May 3, 2026. Any homeowner who applied for NEM 2.0 grandfathering by the April 2023 deadline but did not complete installation by April 15, 2026 has automatically been bumped to NEM 3.0. Thousands of Californians found themselves in this situation—they were in the middle of permitting, financing, or installation when the grandfathering window closed.

What This Means for New Customers

If you are installing solar after May 2026, you are on NEM 3.0 for the entire 20-year contract term. There is no grandfather clause and no path to NEM 2.0 rates. Your export credits will be based on avoided cost—approximately 75% lower than NEM 2.0. This fundamentally changes the financial model.

How NEM 3.0 Export Rates Work: Time-of-Use Matters

Avoided Cost Varies by Hour

Under NEM 3.0, your export rate changes every hour. The avoided cost is higher during peak evening hours (5–9pm) when the grid is most strained and most expensive, and lower during off-peak hours (midnight–5am) when the grid is cheap. Here’s a typical avoided cost schedule (varies by utility):

  • Peak (5–9pm): $0.08–$0.12/kWh
  • Partial Peak (9am–5pm, 9pm–midnight): $0.04–$0.06/kWh
  • Off-Peak (midnight–9am): $0.02–$0.03/kWh

The problem for solar: your system produces most power during the middle of the day (9am–5pm), which is partial-peak. This is when avoided cost is lowest. Peak hours (5–9pm) have the highest avoided cost, but that’s when your solar system produces zero power (unless you have a battery).

This is why battery storage becomes crucial under NEM 3.0.

Why Battery Storage Is Critical Under NEM 3.0

The Storage Arbitrage: Buy Low, Sell High (by Time)

Without a battery, your solar system exports power during the day (low avoided cost) and you buy power from the grid in the evening (high retail rate, around $0.30–$0.40/kWh at peak). This is economically backwards.

Rooftop Solar Panels

With a battery (like a Tesla Powerwall, LG Chem RESU, or similar):

  • You charge the battery with daytime solar power (essentially “buying” at zero cost)
  • You use the battery to power your home during peak evening hours (5–9pm)
  • You avoid buying expensive grid power at peak rates
  • Any remaining daytime solar excess can still be exported at peak-hour avoided cost (higher than daytime rates)

Example: Without a battery, your 6 kW system might export 5 kWh during the day at $0.04/kWh average (low partial-peak rate) = $0.20 earned. With a battery, you charge 5 kWh at zero cost, then avoid buying 5 kWh at peak rate ($0.35/kWh) = $1.75 saved. The battery transforms solar value from export credits to self-consumption savings.

Battery Economics Under NEM 3.0

A residential battery system costs $8,000–$15,000 installed. For a homeowner with moderate electricity consumption (15–20 kWh/day), a 10–15 kWh battery provides 4–6 hours of power, covering the peak evening window (5–9pm) most days. Over 10 years, the battery avoids roughly $8,000–$12,000 in peak-rate electricity purchases (depending on usage and rate increases). This roughly breaks even with the battery cost, and the battery extends system life another 10 years. In high-rate areas like PG&E (SF Bay Area), battery economics are more attractive because retail rates are highest.

The federal Investment Tax Credit (30% ITC) applies to battery systems as well as solar, so a $10,000 battery costs $7,000 net after the credit.

Is Solar Still Worth It in California Under NEM 3.0?

Yes, But the Strategy Has Changed

Solar is still economically attractive in California under NEM 3.0, but the emphasis shifts from grid exports to self-consumption.

Consider a typical California homeowner in PG&E territory (Bay Area):

  • Current electricity bill: $150–$200/month ($0.30–$0.35/kWh for most usage)
  • Solar system cost (after ITC): $12,000–$18,000
  • Annual savings from self-consumption: $1,500–$2,000 (covering 70–80% of usage)
  • Payback period (without battery): 6–10 years
  • 25-year savings: $22,500–$35,000

With a battery:

  • Total cost (solar + battery after ITC): $17,000–$25,000
  • Annual savings from self-consumption + peak-hour avoidance: $2,000–$2,800
  • Payback period: 7–12 years
  • 25-year savings: $28,000–$45,000

The battery extends payback by 1–2 years but increases total long-term savings. It’s a trade-off that makes sense for homeowners planning to stay in their home 10+ years, especially in high-rate utilities like PG&E and SCE.

Where Solar Is Marginal Under NEM 3.0

In low-rate utilities or climates with less sun, solar payback extends to 10–15 years without a battery, which may exceed your planning horizon. Additionally, if you have low electricity consumption (under 8 kWh/day), solar excess is large, and under NEM 3.0 you’re exporting a lot at low avoided cost. Battery becomes essential to make these systems pencil out.

Legal Status: NEM 3.0 Is Here to Stay

Court Challenges and Appeals Have Been Defeated

Homeowners, solar installers, and advocacy groups challenged NEM 3.0 in California court multiple times. In early 2026, the California Court of Appeals upheld NEM 3.0 as lawful and consistent with California Public Utilities Code Section 2827. The court rejected arguments that the policy was unjust or unreasonable. While opponents continue advocating for policy change at the state legislature, legal challenges are exhausted. NEM 3.0 is the law for the foreseeable future.

Other States Watching California

Nevada, Florida, and Arizona have proposed or are considering policies similar to NEM 3.0. California’s experience is the case study. If NEM 3.0 challenges fail in California, other states are more likely to adopt similar policies. For solar customers nationwide, NEM 3.0 signals a broader shift: the days of net metering at retail rates are likely ending. This is one reason acting on solar sooner rather than later makes sense—future customers may face even less favorable policies.

The April 15, 2026 Grandfathering Deadline: What Happened

On April 15, 2026, the three-year grandfathering window for NEM 2.0 closed. Any homeowner who had applied for interconnection before April 15, 2023 but failed to complete installation by April 15, 2026 was automatically transitioned to NEM 3.0. This affected an estimated 50,000–100,000 homeowners who were in the middle of the solar installation process. Permitting delays, financing challenges, and supply chain issues caused many to miss the deadline.

If you are in this situation (applied before April 2023 but didn’t finish by April 2026), you have limited recourse. Contact your installer and utility to confirm your status. A few homeowners have attempted to contest the transition, but the CPUC’s policy is firm: the deadline has passed.

What is NEM 3.0 and how does it differ from NEM 2.0?

NEM 3.0 (Net Energy Metering 3.0) is California’s new solar billing policy in effect since April 15, 2023. Under NEM 2.0, solar customers earned retail-rate credits (full price you pay) for excess power exported to the grid (~$0.25–$0.35/kWh). Under NEM 3.0, you earn avoided-cost credits (~$0.02–$0.08/kWh), representing a 75% reduction. The change was made to address grid costs and equity concerns, though it significantly reduced solar export value.

Can I still get NEM 2.0 rates if I apply for solar now in May 2026?

No. The grandfathering window for NEM 2.0 closed on April 15, 2026. Any solar customer applying for interconnection after that date automatically receives NEM 3.0 rates for the entire 20-year contract term. If you applied before April 15, 2023 and completed installation by April 15, 2026, your NEM 2.0 rates are grandfathered. Otherwise, you are on NEM 3.0.

Why did California implement NEM 3.0?

The California Public Utilities Commission cited three main reasons: (1) grid costs—solar exports shift grid infrastructure costs to non-solar customers; (2) equity—NEM 2.0 benefits wealthy homeowners while renters and apartment dwellers cannot benefit; (3) sustainability—at high solar penetration, NEM 2.0 becomes unsustainable. Whether you agree with these rationales, NEM 3.0 is now law and has been upheld by California courts.

Do I need a battery under NEM 3.0?

Not strictly necessary, but battery storage becomes nearly essential to maximize solar value under NEM 3.0. Without a battery, you export daytime solar at low avoided-cost rates (4–6¢/kWh) and buy peak-evening power at high retail rates (30–40¢/kWh). With a battery, you store daytime solar and use it during peak evening hours, avoiding expensive grid purchases. A 10–15 kWh battery costs $8,000–$15,000 installed ($5,600–$10,500 after the 30% federal tax credit) and typically pays for itself over 10–12 years through peak-rate avoidance.

Is solar still a good investment in California under NEM 3.0?

Yes, but it depends on your utility, electricity consumption, and planning horizon. In high-rate utilities like PG&E (Bay Area) and SCE (Los Angeles), solar with battery still delivers $20,000–$45,000 in 25-year savings and typically pays back in 7–12 years. In lower-rate areas, payback extends to 10–15 years. If you plan to stay in your home 10+ years and your utility rates are $0.25+/kWh, solar is still financially attractive. You’ll want to model your specific situation with a local installer to be sure.

When does the avoided cost credit apply to solar exports under NEM 3.0?

Avoided cost credits under NEM 3.0 vary by time of day. Peak hours (5–9pm) have the highest avoided cost ($0.08–$0.12/kWh), partial-peak hours (9am–5pm, 9pm–midnight) are medium ($0.04–$0.06/kWh), and off-peak hours (midnight–9am) are lowest ($0.02–$0.03/kWh). Since solar systems produce most power during the day (partial-peak, low rates), you earn very little from exports unless you have a battery to shift power to peak evening hours when avoided cost is highest.

Summing Up

NEM 3.0 is a fundamental shift in California solar economics. The 75% reduction in export credits means solar is no longer primarily a “sell excess power to the grid” proposition—it’s now a “consume your own solar power” system. This changes the optimal strategy: battery storage shifts from optional to nearly essential, and system sizing should prioritize self-consumption over maximum exports.

Is solar still worth it under NEM 3.0? Yes, absolutely. California’s electricity rates remain among the highest in the nation, and solar with battery storage still delivers substantial savings over 25 years. But the calculus is different than it was under NEM 2.0. The payback period extends slightly, battery economics become critical, and the decision to go solar requires more careful modeling of your specific situation.

The grandfathering window for NEM 2.0 has closed as of April 15, 2026. If you are considering solar in California, you are on NEM 3.0. Evaluate your situation—electricity consumption, roof suitability, rate structure, planning horizon—with a local installer who understands NEM 3.0 economics deeply. Ready to get quotes from installers familiar with NEM 3.0? Call (855) 427-0058 or get a free quote to compare solar and battery options in your area.

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