Why California Utilities Cap Solar Exports at 60% Off (And What Drives the Cap)

When a Los Angeles homeowner hears "SCE only pays me about 60% of what they used to for my solar," the natural reaction is to blame the utility. It's true that the cap hits solar owners in the wallet — but the "60%" isn't arbitrary, and it isn't pure profiteering. It's the visible result of three real grid problems that California's three investor-owned utilities (SCE, PG&E, and SDG&E) have been arguing about for over a decade.

This article explains why the California Public Utilities Commission (CPUC) agreed to slash export compensation under NEM 3.0 — and what the grid science behind it actually says.

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1. The Duck Curve: Too Much Solar, Too Fast

California's grid runs on something called the duck curve. Every year, more rooftop and utility-scale solar floods onto the grid between 10am and 3pm. On a sunny spring day, solar alone can supply over 80% of California's electricity demand for several hours. Then, around 4–5pm, the sun drops, solar production collapses, and demand spikes as people come home and turn on AC, TVs, and EV chargers.

That creates a problem the grid operator (CAISO) has to solve in real time:

• Midday: too much solar, wholesale prices go negative, and CAISO sometimes has to pay neighboring states to take the surplus.
• Evening: a huge ramp-up from gas plants, batteries, and imports to replace the lost solar.

When the grid pays you the retail rate for midday exports under NEM 2.0, the utility is buying your surplus at $0.30/kWh during the very hours when the wholesale market is worth $0.02 or even negative $0.05/kWh. That gap has to be paid for by someone — and under NEM 2.0, it was paid for by everyone.

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2. Cost-Shifting: Non-Solar Customers Were Subsidizing the Grid

This is the second, and arguably bigger, driver of the cap.

Your electricity bill isn't just paying for the energy you use. A big chunk of it pays for:

• Transmission and distribution wires
• Maintenance and wildfire hardening
• Public-purpose programs (low-income assistance, efficiency)
• Fixed costs the utility incurs whether or not you use any power

Under NEM 2.0, a solar owner who produced 100% of their own usage paid almost nothing toward these fixed grid costs — because they were billed on net energy, not gross. The CPUC's own analysis estimated that by 2030, this cost-shift could reach $1.5 billion per year, paid by non-solar customers (disproportionately lower-income renters) to subsidize solar owners.

The utilities argued — and the CPUC agreed — that this was regressive. The 60–75% export compensation cut under NEM 3.0 was designed to shrink this subsidy and push solar owners toward self-consumption and batteries rather than grid dumping.

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3. Avoided Cost Methodology: Paying What the Power Is Actually Worth

The technical term for the new export rates is Avoided Cost. The idea is simple in theory: the utility should pay you what it would have cost them to generate or buy that power somewhere else.

California's Avoided Cost calculator adds up several components:

• Energy — the wholesale market price for that hour
• Capacity — the value of having generation available during peak demand
• Transmission & distribution — the avoided cost of building wires and substations
• Line losses — energy lost moving power across the grid
• Environmental — avoided greenhouse gas emissions

Under NEM 2.0, every exported kWh was worth the full retail rate regardless of when it was sent. Under NEM 3.0, exports are credited at the hour-specific avoided cost. So a kWh exported at 2pm on a sunny April day is worth almost nothing, while a kWh exported at 7pm on a July evening is worth much more.

That's why the cap lands at roughly 60% off across the year — midday surplus (which is most of what an oversized system exports) is worth a fraction of what evening exports are worth.

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4. Why Not Just Ban Oversized Systems Altogether?

The utilities actually proposed that — a hard cap on system size at 100% of historical usage. The CPUC rejected it as too restrictive and instead used price signals to do the same work. If exports are worth less, the thinking goes, the market will naturally stop oversizing.

That's exactly what's happened. Solar installers in LA now design most new systems at 90–110% of historical usage instead of 130–150%, and battery attachment rates on new installations jumped from under 10% to over 80% in the first year of NEM 3.0.

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5. What This Means for Your System

Whether you love or hate the cap, the practical reality for an LA homeowner is the same:

• Self-consumption is king. Power you use yourself displaces retail-rate electricity at $0.30–$0.40/kWh. That math is unchanged.
• Batteries are no longer optional. Storing your midday surplus for evening use is now the highest-value use of every extra kWh your system produces.
• Time-of-use shifting pays off. Running your EV charger, AC, and heavy appliances during your peak solar window directly reduces the expensive imports you'd otherwise pay for.
• Right-sizing matters more than ever. Adding "just a few more panels" to cover future EV or AC loads makes sense only if you're also adding storage.

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6. The Bigger Picture: It's About the Whole Grid, Not Just You

The 60% export cap is part of a wider grid modernization strategy California has been forced into by the speed of solar adoption:

• Wildfire resilience requires expensive transmission hardening — those fixed costs can't be recovered from net-zero solar customers.
• Renewable integration requires batteries and demand response, not just more panels.
• Equity concerns (raised by environmental justice groups, not just utilities) drove the cost-shift analysis.
• Rate design is moving from volumetric (pay per kWh) toward fixed charges + time-varying energy rates — the cap is one step in that direction.

In other words, the cap isn't really about penalizing solar. It's about restructuring how the grid is paid for so it can absorb the next 20 gigawatts of solar without bankrupting non-solar customers.

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What SolarFix Recommends

If your system was designed under NEM 2.0 thinking (oversized, no battery, exporting surplus), you're the most exposed to the new cap. The good news: a properly sized battery retrofit and a usage-shift plan can typically recover most of the lost value within 3–5 years.

Call SolarFix at (323) 476-5627 or request a system review. We'll audit your SCE bill, model your export credits hour by hour, and show you exactly where the 60% is showing up — and what to do about it. Same-day appointments across Los Angeles County.