The federal solar tax credit terminated on December 31, 2025. New solar installations no longer receive the 30% ITC that previously offset system costs. This shifts the entire financial equation for Orange County homeowners; the California net billing tariff now drives project economics.
NEM 3.0 cut export compensation approximately 75% compared to NEM 2.0. Without federal subsidies, understanding export value mechanics determines whether going solar makes financial sense under current policy.
This guide answers the core question: How does NEM 3.0's export structure work, and what system configuration protects your Orange County solar savings?
NEM 3.0's official name is the Net Billing Tariff (NBT), established through CPUC Decision D.22-12-056 (December 15, 2022) and modified via Resolution E-5301 (November 30, 2023). The tariff became effective April 15, 2023, for PG&E, SCE, and SDG&E customers.
Traditional net metering credits exports at full retail rates. NBT compensates exports at wholesale Avoided Cost Calculator (ACC) rates, roughly $0.08/kWh versus NEM 2.0's $0.30-0.35/kWh retail credit, a 75% reduction. Understanding NEM 3.0 explained through this lens, clarifies why smart inverter functions and battery integration became essential.
Who Gets Placed on NEM 3.0:
April 15, 2023 is the hard cutoff. Complete interconnection applications submitted before this date remain on NEM 2.0's retail-rate structure for 20 years from their Permission to Operate (PTO) date. After 20 years, systems transition to the current tariff (NBT as of 2026). This protection transfers when homes sell, buyers inherit remaining grandfathered years.
| Comparison Factor | NEM 2.0 (Grandfathered) | NEM 3.0 (Net Billing Tariff) |
| Who Qualifies | Application before April 15, 2023 | Application on/after April 15, 2023 |
| Grandfathering Duration | 20 years from PTO date | N/A, current tariff |
| Export Compensation | Retail rate (~$0.30-0.35/kWh) | Wholesale ACC rate (~$0.08/kWh) |
| Home Sale/Transfer | Status transfers with system | Applies to all new systems |
NBT credits exports at wholesale ACC rates, the grid's marginal cost to avoid generating electricity at that specific hour. Solar export credits California homeowners receive no longer match retail rates because wholesale value excludes transmission costs, distribution infrastructure, and utility overhead.
The reduction is dramatic: NEM 2.0 credited exports at $0.30-0.35/kWh for SCE customers. NBT averages $0.08/kWh, a 75% cut. This explains why battery required for NEM 3.0 systems became essential, storing daytime solar for evening self-consumption avoids buying expensive peak-hour grid power rather than selling generation for minimal credits.
| Value Driver | Impact on Export Rate | System Design Implication |
| Hour of Day | Evening peaks higher, midday lower | Size battery to shift daytime exports to evening loads |
| Season | Summer higher, winter lower | Optimize storage dispatch for summer months |
| Weekday vs Weekend | Weekdays higher | Program battery cycles for weekday peaks |
Monthly Billing: Credits accumulate monthly based on hourly export rates. Unused credits roll month-to-month through a 12-month cycle. At annual true-up, excess credits expire with zero cash value, and shortfalls require payment at retail rates.
NBT mandates Time-of-Use (TOU) plans with higher rates during 4-9 PM peak hours and lower rates during midday/overnight. The timing structure matters more than total consumption; using 800 kWh during peak costs significantly more than 800 kWh off-peak.
Solar-plus-storage systems exploit this by charging batteries with cheap midday solar and discharging during expensive evening peaks, avoiding high retail rates rather than earning minimal export credits.
| Utility | Required TOU Plan | Peak Window | Best-Fit Profile |
| SCE | TOU-D-4-9PM | 4-9 PM every day | Standard households with evening usage |
| PG&E | EV2-A (residential) | 4-9 PM weekdays | Households with EV charging flexibility |
| SDG&E | TOU-DR | 4-9 PM every day | Families shifting major loads off-peak |
Self-consumption became the primary savings mechanism. Exporting midday solar earns $0.08/kWh through ACC rates. That same kilowatt-hour consumed during evening peak avoids purchasing grid power at $0.30-0.35/kWh, a 4-5x value difference. CPUC analysis shows solar-only systems save $100 monthly, while solar-plus-storage achieves $136+ monthly savings, a 36% improvement through strategic battery discharge.
System Sizing Rules:
Charges That Still Apply:
Avoiding $0.30-0.35/kWh retail purchases delivers 4-5x more value than earning $0.08/kWh export credits. Without storage, midday solar exports at wholesale while evening consumption purchases at retail. Batteries capture the $0.22-0.27/kWh retail-wholesale spread as pure savings.
Solar-only NBT systems average $100 monthly savings. Add a battery and savings jump to $136+, a 36% improvement. High-usage households (1,200+ kWh monthly) with optimized storage achieve 70-90% bill offsets versus 40-50% solar-only. Solutions like the Tesla Powerwall provide necessary storage capacity for peak-hour arbitrage.
Payback periods compress accordingly. Solar-plus-storage achieves a nine-year payback despite losing the 30% federal ITC. SGIP Equity Resiliency rebates ($1.10/Wh) can cover $11,000-15,000 of battery costs. Understanding AC vs DC coupled solar batteries helps optimize configuration.
| TOU Period | Battery Action | Why |
| Off-Peak (Midnight-4 PM) | Charge from solar or grid | Lowest rates, maximize solar capture |
| Peak (4-9 PM) | Discharge to loads | Avoid highest retail rates ($0.30-0.35/kWh) |
| Backup Reserve | Maintain 20-30% minimum | Outage protection |
| Primary Goal | Sizing Approach | Benefit | Tradeoff |
| Bill Savings | 10-13.5 kWh | Maximize retail rate avoidance | Limited backup duration |
| Backup Power | 13.5-20 kWh | Outage resilience | Higher upfront cost |
| Whole-Home Backup | 20-30+ kWh | Complete home coverage | Reduced daily arbitrage |
| EV Charging | 15-25 kWh | Avoid expensive peak EV charging | Competes with backup capacity |
Accurate estimates require understanding your specific usage patterns. Analyze your utility bill structure, then model how solar-plus-storage shifts consumption away from expensive peak periods.
Step 1: Identify Your Current Rate Structure
Step 2: Map Hourly Usage to TOU Periods
Step 3: Estimate Self-Consumption vs. Exports Without storage, 60-70% of solar exports at $0.08/kWh. Batteries capture this waste for evening discharge. Typical homes: 20-30% self-consumption without battery, 70-85% with storage.
| Proposal Assumption | Reasonable Range | Red Flags |
| Annual Production | 1,200-1,400 kWh per kW (SCE territory) | >1,500 kWh/kW or <1,100 kWh/kW |
| Degradation Rate | 0.5-0.8% annually | "No degradation" claims or >1% |
| Rate Escalation | 3-5% annually | >6% (inflates savings) or <2% |
| Export Pricing | $0.06-0.10/kWh average | Using retail rates ($0.30+) |
Sanity-Check Questions:
The federal 30% ITC terminated on December 31, 2025. California's Self-Generation Incentive Program (SGIP) now represents the primary incentive, though equity-focused programs remain available for qualifying low-income households.
| SGIP Component | Equity Resiliency Budget Details |
| Storage Incentive | $1.10/Wh for battery capacity |
| Paired Solar Incentive | $3.10/W (must install storage simultaneously) |
| Who Qualifies | Low-income (≤80% AMI), DAC residents, 2+ PSPS events, tribal areas |
| Example Rebate | 10 kWh battery = $11,000; 6 kW solar + 10 kWh battery = $29,600 total |
| Current Status | Waitlists in PG&E, SCE, SDG&E, 6-18 month delays |
DAC-SASH: $8.5M annual funding for low-income homeowners in disadvantaged communities. Administered by GRID Alternatives.
SOMAH: Funded through 2032 for multifamily affordable housing (5+ units).
Federal ITC (No Longer Available): 30% credit terminated for systems placed in service after December 31, 2025. If you are installed by deadline, retain all documentation, credit can be claimed on 2025 tax return and carried forward.
Oversizing arrays represents the costliest error. Excess annual generation creates credits that expire at true-up with zero value. Right-sizing to 100% annual offset maximizes ROI.
Why Installer Estimates Vary:
| Contract Term | What to Look For | Red Flag Examples |
| Rate Escalators | Fixed kWh price or annual cap | "2.9% annual escalator" on 25-year PPA |
| Production Guarantees | Stated kWh/year with compensation | "Estimated production" with no guarantee |
| Warranty Coverage | 25-year panel, 10-year inverter minimum | Workmanship warranty only |
| Battery Throughput | 70% capacity retention at 10 years | No throughput warranty |
Policy Items to Monitor: CPUC's three-year NBT review starts after April 2026, potentially modifying export rates or adding fixed charges. Track CPUC proceedings at cpuc.ca.gov.
NBT provides monthly bill credits at wholesale ACC rates averaging $0.08/kWh. At annual true-up, surplus credits expire with zero cash value; you receive no check for excess generation.
Yes, but you'll miss SGIP's paired solar incentive ($3.10/W). Equipment compatibility matters; ensure your inverter supports battery integration or budget for hybrid inverter replacement ($3,000-6,000).
Avoid switching unless usage patterns changed significantly. Model both plans using 12-month interval data before requesting changes. SCE allows one TOU switch annually.
Solar-only saves approximately $100/month, poor ROI compared to solar-plus-storage's $136+ monthly savings. If budget constraints prevent battery inclusion, install battery-ready infrastructure and add storage when finances improve.
NEM 3.0 reduced export compensation 75% from retail to wholesale rates. Battery storage became essential; the 4-5x value difference between avoiding $0.30-0.35/kWh retail purchases and earning $0.08/kWh export credits drives viability. Without the 30% federal ITC, SGIP Equity Resiliency rebates ($1.10/Wh storage, $3.10/W paired solar) represent the primary cost-offset for qualifying homeowners, though waitlists extend 6-18 months.
Right-sizing to 100% annual consumption prevents wasted surplus credits, while proper battery dispatch captures peak-hour arbitrage, maximizing bill reduction. Current tariff economics favor solar-plus-storage, achieving 70-90% bill offsets with 9-year paybacks for appropriately designed systems.
Final Checklist: Next Steps
Ready to design a solar-plus-storage system optimized for NEM 3.0 economics? Contact Infinity Solar's Orange County team for a detailed bill analysis.
