California killed the deal that made rooftop solar a no-brainer. On April 15, 2023, NEM 3.0 went live, and the economics shifted more dramatically than at any point in the past two decades. I’ve spent months with these numbers since then, talking to homeowners who installed systems just in time and others now wondering if solar still makes sense. The honest answer: it’s complicated, and the gap between a smart solar decision and a wasteful one just got much wider.

Here’s what the utilities and many installers aren’t leading with.

NEM 2.0 vs NEM 3.0 Economics Comparison

This table shows how the same solar system performs under each program, illustrating why system design strategy must change.

FactorNEM 2.0NEM 3.0Impact
Export credit rate (avg)$0.28-$0.34/kWh$0.05-$0.08/kWh75% reduction in export value
Annual export value (5,000 kWh exported)~$1,500~$300$1,200/year lost income
Payback period (solar only, 8kW system)5-7 years9-12 yearsNearly doubles without battery
Payback period (solar + battery)7-9 years6-8 yearsBattery now shortens payback
Optimal system designMaximize production, export freelyMatch consumption, minimize exportsSmaller systems often better ROI
Battery necessityOptional (backup convenience)Financially essentialAdd $8K-$15K to project cost
Best value hours for self-consumptionAny hour (credits equal)4-9 PM (TOU peak rates $0.45+/kWh)Shift usage or store for evening
Break-even self-consumption ratio~30-40%~70-80%Must use most of what you generate

General information for comparison, confirm specifics for your situation.

What NEM 3.0 Actually Changed (And Why It Hurts)

Net Energy Metering used to be elegantly simple. Generate more solar than you use during the day, export the surplus to the grid, get credited at close to the retail rate for every kilowatt-hour. Under NEM 1.0 and NEM 2.0, that retail-rate credit made the math work. A kilowatt-hour exported at noon was worth roughly what you’d pay for one at 7 p.m.

NEM 3.0 blew that up.

The new rule, applying to customers of PG&E, SCE, and SDG&E, slashes the average export credit by about 75%. Instead of retail rates (now averaging over $0.30/kWh on tiered plans in California), you’re compensated at what the California Public Utilities Commission calls the “Avoided Cost Calculator” rate. That varies by time of day and season, hovering around $0.05 to $0.08 per kilowatt-hour during daytime hours.

Under NEM 2.0, a 10,000 kWh/year system exporting half its production might generate $1,500 in annual credits. Under NEM 3.0, that same export earns $250 to $400. You’re leaving serious money on the table if you’re still designing systems the old way.

What struck me when I read the CPUC’s actual ruling was how deliberate this was. The commission argued, with some economic backing, that NEM 2.0 effectively subsidized solar customers (most of them wealthier) at the expense of non-solar ratepayers. Whether you buy that framing or not, the outcome is unmistakable: exporting solar power is now worth very little.

The Battery Question Is No Longer Optional

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Under NEM 2.0, battery storage was a luxury. Backup power during blackouts, maybe some time-of-use arbitrage if you knew what you were doing. Plenty of homeowners went solar without a battery and did fine.

Under NEM 3.0? A battery is basically the strategy.

Here’s why. The Avoided Cost Calculator rates aren’t uniformly low. Export credits actually spike in late afternoon and evening hours, when grid demand peaks and the sun sets. Between roughly 4 p.m. and 9 p.m., export rates can hit $0.25 to $0.30/kWh or higher on peak days. The game under NEM 3.0 is storing your cheap midday solar in a battery, then using it yourself during expensive evening hours or exporting it when credits are actually valuable.

EnergySage’s market data consistently shows California solar-plus-storage projects now have shorter payback periods than standalone solar in many utility territories. That’s a dramatic reversal from two years ago.

The standard pairing right now is a solar array with a Tesla Powerwall 3 (around $11,500 installed) or an Enphase IQ Battery 5P. Some installers recommend Franklin Electric APsystems as a cheaper alternative. The economics shift enough with even one battery that most California homeowners going solar under NEM 3.0 should run the numbers with storage included. If your installer quotes solar-only without explaining why storage doesn’t work for your situation, that’s a warning sign.

The whole point now is self-consumption. You want to use as much of your own solar production directly as possible, not export it. That means thinking about when you run the dishwasher, when you charge your EV, whether a smart panel like the Span Panel ($3,500 to $4,500 installed) makes sense. I know that sounds like constant management, but automation tools handle most of it now.

Devices like the Emporia Vue Gen 3 Energy Monitor give you circuit-level data to see where your power’s actually going before you even install panels.

Does Solar Still Make Financial Sense in California?

I get this question all the time. The answer’s gotten messier.

Under NEM 2.0, a well-designed California solar system with decent sun and a $300/month electric bill could pay back in 6 to 8 years and generate $40,000 to $60,000 in lifetime savings. That was reliable. NEM 3.0 has stretched payback periods for solar-only systems to 9 to 14 years in many cases. It’s not terrible, but it’s no longer the obvious choice it once was.

The math improves substantially when three things line up: a battery, a time-of-use rate plan (essentially mandatory for NEM 3.0 customers with all three major California utilities), and high self-consumption. NREL modeling suggests that optimized solar-plus-storage systems under NEM 3.0 can match what standalone solar achieved under NEM 2.0. The key is optimization.

A few things still work in your favor. The federal Investment Tax Credit stays at 30% through at least 2032 for both solar panels and batteries charged by solar. California’s property tax exclusion for solar still exists. And California electricity rates, driven by wildfire costs and grid upgrades, aren’t dropping. PG&E residential rates jumped more than 30% between 2021 and 2023 alone. The higher your bill, the more protection solar provides, even under NEM 3.0.

Where solar doesn’t work right now: renters. Homeowners planning to sell within 4 to 5 years before capturing payback. Homes with serious shade. Anyone with a monthly electricity bill under about $100. Below that, the system’s too small and savings too thin for the math to work, especially with storage costs added in.

The Grandfathering Situation

If you already have a solar system installed under NEM 2.0, you’re protected. The CPUC grandfathered existing NEM 2.0 customers for 20 years from their interconnection date. If you got your Permission to Operate before April 15, 2023, you’re under the old rules until the early 2040s. That’s genuinely valuable.

What’s murky is what happens when you upgrade your system. Adding a battery to an existing NEM 2.0 installation is usually possible without triggering NEM 3.0, as long as you don’t expand the solar array significantly. The rules vary by utility, so this deserves a careful conversation with your installer, not just a verbal nod.

If you’re under NEM 2.0 and considering storage, moving soon still makes sense. Rate structures keep shifting, and the 30% federal tax credit on batteries is time-limited.

The Bigger Picture Most People Miss

NEM 3.0 isn’t a random policy tweak. It’s part of California’s broader shift in how it thinks about distributed solar. The state still wants aggressive clean energy targets (90% clean electricity by 2035), but grid planners want solar that acts like a grid asset: storing power when it’s cheap, dispatching it when the grid needs it most.

That’s actually sensible. A grid of homes with solar and batteries that intelligently charge and discharge is more valuable than one with homes dumping power at noon and causing curtailment problems. The issue is the policy shifted abruptly before most homeowners or installers fully grasped it.

The trajectory points toward virtual power plants, where your battery participates in grid services for payments or credits. PG&E, SCE, and some third-party aggregators already run these programs. If you’re buying a battery, check whether it qualifies for VPP programs.

The payoff on NEM 3.0 favors a different solar customer: one who pairs storage with panels, optimizes self-consumption, and treats their home energy system as something to actively manage. That person can still do very well financially in California. The person expecting 2019’s simple economics? Those days are over.

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Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.