How NEM 3.0 Affects Your Solar Savings in California

What Is NEM 3.0?

If you’ve been researching solar in California, you’ve heard the term “NEM” thrown around. It stands for Net Energy Metering—the billing arrangement that determines how much your utility pays you for the excess solar power you send back to the grid. Think of it as the rulebook for your solar savings.

NEM 3.0 is the latest version of that rulebook. It took effect on April 15, 2023, for new solar customers. It replaced NEM 2.0, which had been in place since 2016. The difference between the two is massive—and it directly impacts your bottom line.

The Core Change: From Retail to Wholesale

Under NEM 2.0, you got paid the full retail rate for every kilowatt-hour (kWh) of excess solar you exported to the grid. In California, that retail rate averaged around $0.30 per kWh. That was a sweet deal. Your solar panels essentially turned your meter backward at the same price you paid to buy electricity.

NEM 3.0 replaces that with a Net Billing Tariff. You no longer get paid the retail rate. Instead, your exports are valued based on the Avoided Cost Calculator—a formula that calculates what the utility saves by not having to generate or buy that power itself. The result? Your export rate drops to roughly $0.05 to $0.08 per kWh on average—a 75% to 80% reduction.

Let’s put that in plain numbers:

Scenario	NEM 2.0 (Retail Rate)	NEM 3.0 (Export Rate)
Excess solar sent to grid (1,000 kWh/year)	~$300 credit	~$60 credit
Bill offset for typical home	90-100%	50-75%
Typical payback period	5-7 years	8-12 years

That’s a stark drop. But here’s the nuance: you can still use your own solar power for free. The sting comes when you send extra power to the utility. They pay you pennies instead of dimes.

The Export Compensation Formula: How It Works

The new formula is not a single fixed rate. It’s dynamic and changes every hour based on grid conditions. The California Public Utilities Commission (CPUC) designed it to reflect the actual value of solar at different times of day.

Here’s the breakdown:

• Time-of-Use (TOU) periods: Your export rate varies by season and hour. Summer afternoons (when solar peaks) get the lowest rates—sometimes as low as $0.02/kWh. Evening hours (4-9 PM) get slightly higher rates, but still far below retail.
• Avoided Cost Components: The rate includes avoided energy costs, avoided generation capacity, avoided transmission, and avoided environmental compliance. It’s complex, but the bottom line is simple: you get paid less when the grid is flush with solar (midday) and a bit more when it’s scarce (evenings).
• Monthly netting, not annual: Under NEM 2.0, you could bank credits over 12 months. Under NEM 3.0, your net usage is calculated monthly. Any excess at the end of the month is compensated at the low export rate. You lose the ability to carry forward summer surplus to offset winter bills.

Real-world example: Say you generate 800 kWh in June but only use 500 kWh. Under NEM 2.0, those 300 extra kWh earned you ~$90 in credits to use later. Under NEM 3.0, those 300 kWh earn you ~$18—and you can’t roll them over. You just get a small check or a tiny credit.

The Transition Timeline: When It Hit and Who’s Affected

The CPUC approved NEM 3.0 in December 2022. It went live for all new interconnection applications submitted after April 14, 2023. Here’s how the timeline breaks down:

• Before April 15, 2023: If you submitted your interconnection application and got it approved, you were grandfathered into NEM 2.0 for 20 years. That’s a massive win.
• April 15, 2023 – present: All new solar customers automatically fall under NEM 3.0. There are no exceptions for system size or installer.
• Grandfathering for existing customers: If you already had solar under NEM 1.0 or 2.0, you keep your old rate for 20 years from your interconnection date. That protection doesn’t change—unless you make significant system modifications (like adding more than 1 kW of capacity).

Key date to remember: If you’re considering solar now, you’re locked into NEM 3.0. No grandfathering loophole exists for new applicants.

What About the “Transition Period” Confusion?

A lot of homeowners heard about a “grace period” or “transition period” for NEM 3.0. Let me clear that up. The CPUC allowed a 120-day grace period for projects that were already in the pipeline—systems that had signed contracts but hadn’t submitted interconnection paperwork. That window closed on April 15, 2023. After that, every new application defaults to NEM 3.0.

So if you’re reading this in 2024 or later, you’re squarely in NEM 3.0 territory. No special exceptions.

Why Did This Change Happen?

The CPUC’s stated goal was to align solar compensation with grid costs. Under NEM 2.0, non-solar customers were subsidizing solar owners’ grid maintenance fees. The utility companies—PG&E, SCE, SDG&E—argued that solar households weren’t paying their fair share for infrastructure. The CPUC agreed.

But the real driver was politics and utility lobbying. The three big investor-owned utilities spent millions pushing for NEM 3.0. They wanted to slow rooftop solar adoption and protect their profits. The result is a policy that slashes solar savings by 50-75% for new customers.

The Bottom Line for You

NEM 3.0 is a fundamental shift. You can’t rely on exporting power to make your solar math work anymore. The days of “sell high, buy low” are gone. Instead, you need to focus on self-consumption—using the power you generate as it’s made.

That means battery storage isn’t a luxury anymore. It’s a necessity. A properly sized battery lets you store your cheap midday solar and use it during expensive evening hours. Without a battery, you’re exporting at $0.06/kWh and buying back at $0.40/kWh. That’s a losing game.

In short: NEM 3.0 makes solar less profitable on its own. But paired with smart energy management and storage, it’s still a solid investment—just with a longer payback period and a different strategy.

How Your Solar Savings Have Changed

Let’s cut through the noise. If you installed solar under NEM 2.0, you locked in a deal that’s now gone. If you’re shopping today under NEM 3.0, your financial picture looks different. Not bad. Just different. And you need to see the exact numbers to know if it still works for you.

The Old Gold: NEM 2.0 Savings

Under NEM 2.0, your utility paid you the full retail rate for every kilowatt-hour you sent back to the grid. That rate, for a typical California home on a Time-of-Use plan like PG&E’s E-TOU-C, was around $0.30 to $0.40 per kWh during peak hours. Your solar system effectively ran your meter backward at the same price you paid to buy power.

Here’s what that looked like for a typical 7.5 kW system in a home using 10,000 kWh per year:

Metric	NEM 2.0 Value
Annual solar production	11,000 kWh
Direct self-consumption	4,000 kWh (saved at ~$0.32/kWh)
Excess exported to grid	7,000 kWh (credited at ~$0.32/kWh)
Annual utility bill savings	$3,520
System cost (after 30% federal tax credit)	~$18,000
Simple payback period	~5.1 years

That’s right. Under NEM 2.0, you could pay off your solar in just over five years. After that, you were generating pure profit for the next 20 years of the system’s life. Total 25-year savings? Roughly $70,000 to $80,000, depending on utility rate hikes.

The New Reality: NEM 3.0 Savings

Now, here’s the gut punch. Under NEM 3.0, the rate utilities pay you for exported power dropped dramatically. Instead of the full retail rate of $0.32/kWh, you now get the “Avoided Cost Calculator” rate, which averages around $0.05 to $0.08 per kWh for most homeowners. That’s a 75% to 84% reduction in export compensation.

Let’s run the same 7.5 kW system through NEM 3.0 numbers. Same home, same usage, same solar production:

Metric	NEM 3.0 Value
Annual solar production	11,000 kWh
Direct self-consumption	4,000 kWh (saved at ~$0.32/kWh)
Excess exported to grid	7,000 kWh (credited at ~$0.06/kWh)
Annual utility bill savings	$1,700
System cost (after 30% federal tax credit)	~$18,000
Simple payback period	~10.6 years

Your annual savings just dropped from $3,520 to $1,700. That’s a 52% reduction in yearly cash flow. Your payback period more than doubled, from 5.1 years to 10.6 years.

Why the Huge Drop? It’s All About the Exports

The math is brutally simple. Under NEM 2.0, the 7,000 kWh you exported earned you $2,240 per year. Under NEM 3.0, those same exports earn you just $420. That’s a loss of $1,820 annually. Your self-consumption savings stayed the same—$1,280 per year—because you still avoid buying power when the sun is shining. But the export revenue collapsed.

Here’s the breakdown side-by-side:

Savings Component	NEM 2.0	NEM 3.0	Change
Self-consumption savings	$1,280	$1,280	$0
Export credits	$2,240	$420	-$1,820
Total annual savings	$3,520	$1,700	-$1,820

The Payback Period Math Gets Ugly

Let’s stretch this out over the full 25-year system life. Under NEM 2.0, you’d save $88,000 total. Under NEM 3.0, that drops to $42,500. That’s $45,500 left on the table.

But here’s the hidden killer: time value of money. A 10.6-year payback means you’re tying up $18,000 for over a decade before you break even. If you had invested that money in a simple S&P 500 index fund averaging 8% annual returns, it would grow to nearly $39,000 in the same period. Your solar system, under NEM 3.0, only saves you $18,000 in that timeframe. You’re effectively losing money compared to a basic stock market investment.

Can You Still Make NEM 3.0 Work? Yes, But You Have to Change Your Strategy

The key is self-consumption maximization. You need to use as much of your solar power as possible while the sun is shining, and avoid sending cheap power to the grid. Here’s what that means in practice:

• Battery storage changes everything. With a battery, you can store your excess solar during the day and use it at night. Instead of exporting 7,000 kWh at $0.06, you can shift that power to evening hours when retail rates hit $0.40 to $0.50 per kWh. That turns $420 in export credits into $2,800 in avoided costs.

• Time your usage. Run your dishwasher, pool pump, and EV charging during solar hours. Every kWh you pull from the grid at night is a missed opportunity.

• Consider a smaller system. Oversizing under NEM 3.0 is a losing bet. You’re exporting at pennies. Build a system that covers 80-90% of your daytime usage, not 110%.

Real-World Example: With a Battery

Let’s add a 10 kWh battery to that same 7.5 kW system. The battery costs about $12,000 installed, before tax credits. With the 30% federal credit, your net cost is $8,400. Total system cost: $18,000 (solar) + $8,400 (battery) = $26,400.

Now your savings change dramatically:

Metric	NEM 3.0 (No Battery)	NEM 3.0 (With Battery)
Self-consumption	$1,280	$1,280
Battery shifting (nighttime avoidance)	$0	$2,800
Export credits	$420	$0
Total annual savings	$1,700	$4,080
System cost	$18,000	$26,400
Payback period	10.6 years	6.5 years

The battery turns your solar system from a mediocre investment into a strong one. You’re now saving more than you did under NEM 2.0, because you’re avoiding peak retail rates that are higher than your old NEM 2.0 export rate.

The Bottom Line on Your Savings

Here’s the truth: NEM 3.0 doesn’t kill solar. But it kills the old “set it and forget it” model. You can’t just slap panels on your roof and expect a 5-year payback. You have to be intentional.

• If you go solar without a battery under NEM 3.0, expect a 10-12 year payback and annual savings of about $1,500 to $2,000 for a typical home.
• If you add a properly sized battery, expect a 6-8 year payback and annual savings of $3,500 to $4,500—beating NEM 2.0 returns.
• If you can’t add a battery, focus on daytime usage and a right-sized system. Even then, you’ll save money, just not as much.

Your solar savings have changed. But the math still works—if you adapt. Don’t compare your future system to your neighbor’s NEM 2.0 deal. Compare it to doing nothing. And doing nothing means paying $3,500+ per year to your utility forever. Even under NEM 3.0, solar still beats that.

Why Batteries Are Now Essential

Let’s be blunt: under NEM 3.0, a solar-only system is a losing financial strategy. The old days of selling your extra power back to the grid for near-retail rates are gone. Now, utilities pay you pennies on the dollar. You’d be giving away your most valuable asset—the electricity you generate at peak sun hours—for almost nothing.

A battery changes that completely. It turns your solar panels from a daytime-only generator into a 24/7 power plant that you control. Instead of exporting cheap power at 2 PM, you store it. Then you use it at 8 PM, when grid electricity costs three to four times more. That’s the core shift: from being a wholesale energy seller to a retail energy saver.

The Math of Self-Consumption vs. Export

Under NEM 2.0, exporting 1 kWh of solar power earned you about $0.30 in credits. Under NEM 3.0, that same export earns you roughly $0.05 to $0.08. That’s a 75-83% pay cut. Meanwhile, the retail price you pay for grid power at night is still $0.40 to $0.60 per kWh.

Here’s the brutal comparison:

Scenario	You Generate 10 kWh	You Export at $0.06/kWh	You Buy at Night at $0.50/kWh	Net Cost
Solar Only	10 kWh	$0.60 credit	Need 8 kWh = $4.00	-$3.40 (you lose)
Solar + Battery	10 kWh	$0.00 export	Store 8 kWh, use at night	$0.00 (grid cost eliminated)

You see it? Without a battery, you’re sending money to the utility every single night. With a battery, you zero out your evening bill. Over a year, that difference adds up to thousands of dollars.

Time-of-Use Rate Arbitrage: The Hidden Goldmine

California’s major utilities—PG&E, SCE, SDG&E—all use Time-of-Use (TOU) rate plans. These plans charge you different prices depending on the hour. The peak period, typically 4 PM to 9 PM, is when electricity is most expensive. That’s also when your solar panels are producing the least.

A battery lets you play arbitrage. Here’s the playbook:

1. Charge during the day (9 AM - 3 PM) when solar is abundant and grid prices are low ($0.25/kWh).
2. Discharge during peak (4 PM - 9 PM) when grid prices are high ($0.50-$0.60/kWh).
3. Repeat daily.

The spread between off-peak charging and peak discharging is your profit. In many areas, that spread is $0.25 to $0.35 per kWh. A typical 10 kWh battery can cycle through that spread every day. That’s $2.50 to $3.50 per day in avoided costs, or $900 to $1,275 per year—just from rate arbitrage alone.

The "Avoided Cost" Stack

Your battery doesn’t just save you on rate arbitrage. It stacks multiple savings streams:

• Peak shaving: You avoid the highest retail rates entirely.
• Demand charge avoidance: If you’re on a commercial or rural residential rate with demand charges, a battery can shave your peak demand, saving you $50-$200 per month.
• Backup value: While not purely financial, the peace of mind during Public Safety Power Shutoffs (PSPS) is real. A battery keeps your lights on, your fridge running, and your internet working during outages that can last days.

Real-World Numbers: A Case Study

Let’s look at a typical home in PG&E territory. You have an 8 kW solar system, no battery, under NEM 3.0. Your annual production is 12,000 kWh. You use 10,000 kWh at home, export 2,000 kWh.

• Solar-only scenario: You export 2,000 kWh at $0.06 = $120 credit. You buy 4,000 kWh from the grid at night and cloudy days at $0.50 = $2,000 bill. Net annual cost: $1,880.
• Solar + 10 kWh battery: You store 3,500 kWh of your excess solar. You export only 500 kWh at $0.06 = $30 credit. You buy only 500 kWh from the grid at $0.50 = $250 bill. Net annual cost: $220.

That’s a $1,660 annual savings by adding a battery. Over the 10-year warranty life of the battery, that’s $16,600 in avoided costs. A quality battery costs $10,000 to $14,000 installed after the federal tax credit. Your payback period? Roughly 6 to 8 years. After that, it’s pure profit.

The "Solar-Only" Trap

I hear homeowners say, "I’ll just add more panels to offset my usage." That’s a mistake. Under NEM 3.0, overproducing is punished. Every extra panel you install just generates more low-value exports. You’re better off buying fewer panels and one battery. The battery turns your system into a precision instrument that matches your consumption to your production.

Think of it this way: a solar-only system is a leaky bucket. You fill it during the day, but it drains out at night. A battery plugs the leak. You keep every drop of value.

What About the Battery Tax Credit?

The federal Investment Tax Credit (ITC) covers 30% of your battery cost, even if you charge it from the grid. That’s a $3,000 to $4,200 discount on a $10,000-$14,000 battery. California also has the Self-Generation Incentive Program (SGIP), which can give you an additional $200 to $1,000 per kWh of storage, depending on your income level. Some homeowners get their battery for 50-60% off after both incentives.

The Bottom Line

You don’t buy a battery for backup power. You buy it because it’s the only way to make NEM 3.0 work in your favor. Without it, your solar system is a depreciating asset. With it, you lock in low energy costs for the next 15-20 years. The battery isn’t an add-on. It’s the engine of your savings.

If you’re serious about solar in California today, start your planning with the battery. Then size your solar panels to charge it. That’s the winning formula under NEM 3.0.

Sizing Your System for NEM 3.0

Under NEM 3.0, the old rule of thumb—“cover 100% of your annual usage with solar panels”—is dead. That strategy worked when you got paid retail rates for every kilowatt-hour you sent back to the grid. Now, you’re exporting power for roughly 75% less. If you oversize your array, you’re basically giving the utility a huge discount on your energy. You need to size your system to match your load profile, not just how much roof space you have.

The Overproduction Trap

Let’s be blunt: overproduction hurts your wallet under NEM 3.0. Here’s the math. If you generate 10,000 kWh a year but only use 7,000 kWh on-site, you’re exporting 3,000 kWh. Under NEM 2.0, you’d get about $0.30/kWh for that excess. Under NEM 3.0, you’ll get roughly $0.08/kWh. That’s a loss of $660 per year. Over a 25-year system life, that’s over $16,000 in missed savings.

The goal is simple: self-consumption. You want to use as much of your solar power in your home as possible. Every kWh you use directly from your panels saves you the full retail rate (around $0.30–$0.40 in California). Every kWh you export earns you pennies.

Step 1: Understand Your Hourly Load Profile

Forget annual totals. You need to know what your home does hour-by-hour. Pull your utility data from the last 12 months. You’re looking for three things:

• Morning peak (6 AM – 9 AM): Coffee, showers, lights, refrigerators. This is when your solar is just waking up.
• Midday dip (10 AM – 3 PM): Solar is cranking, but you’re likely at work. This is your biggest export window.
• Evening peak (4 PM – 9 PM): You’re home. AC, cooking, TV, charging devices. Solar is fading fast.

Under NEM 3.0, the evening peak is brutal. From 4 PM to 9 PM, you’re pulling from the grid at the highest rates (often $0.40–$0.50/kWh). Your solar production is dropping to near zero by 6 PM. Without a battery, you’re buying expensive power right when you need it most.

Step 2: Right-Size the Solar Array

Here’s the rule: Size your array to cover 80–90% of your annual usage, not 100%. Why? Because the last 10–20% of production is almost entirely export. You’re paying for panels that generate low-value power. It’s financially inefficient.

Example:

Annual Usage	Old NEM 2.0 Size	New NEM 3.0 Size	Savings Difference
10,000 kWh	7.5 kW array	6.5 kW array	~$500/year less in export losses
15,000 kWh	11.0 kW array	9.5 kW array	~$750/year less in export losses

You save money by not buying those extra panels. The smaller array also reduces your upfront cost by $2,000–$4,000. That cash is better spent on a battery.

Step 3: The Battery Is Your Savings Engine

A battery changes everything under NEM 3.0. It lets you store your cheap midday solar and discharge it during the expensive evening peak. This is called load shifting. Here’s how it works:

• Without battery: You export 4 kWh at $0.08/kWh (earning $0.32). You buy 4 kWh at 6 PM for $0.45/kWh (costing $1.80). Net loss: $1.48.
• With battery: You store those 4 kWh in your battery. At 6 PM, you discharge them to your home. You avoid buying grid power. Net savings: $1.80.

Over a year, that adds up to $500–$1,200 in avoided costs, depending on your usage.

Sizing your battery: Don’t buy the biggest battery you can afford. Buy the right size for your evening load. Most California homes use 15–25 kWh between 4 PM and 9 PM. A 10 kWh battery covers about half of that. A 13.5 kWh battery (like a Tesla Powerwall) covers 60–70%. You don’t need to cover 100%—just enough to shift your biggest loads.

Step 4: Match Battery to Load, Not Solar

A common mistake: people buy a battery that matches their solar array size. That’s wrong. Your battery should match your evening consumption, not your daytime production. For example:

• Home A: Uses 8 kWh in the evening. Solar produces 30 kWh midday. Battery should be 10 kWh (covers evening peak).
• Home B: Uses 20 kWh in the evening. Solar produces 40 kWh midday. Battery should be 20–25 kWh (two Powerwalls or equivalent).

Battery sizing rule of thumb: Multiply your evening peak usage (4 PM–9 PM) by 1.2 to account for inverter losses and buffer. That’s your target usable capacity.

Step 5: Avoid the “Roof Space Trap”

Just because you have a big south-facing roof doesn’t mean you should fill it. More panels mean more export. Under NEM 3.0, each additional panel beyond your load profile is a liability. You’re paying $400–$500 per panel for equipment that generates pennies on the dollar.

Instead, ask yourself:

• Can I shift my laundry, dishwasher, and EV charging to midday? (This increases self-consumption without adding panels.)
• Do I have a heat pump water heater? (It can run during solar hours, storing hot water for evening use.)
• Can I add a smart thermostat to pre-cool my home before 4 PM?

These load-shifting strategies are cheaper than adding panels. They boost your self-consumption ratio from 40% to 60% or higher. That’s a 50% increase in savings without a single extra watt of solar.

The Final Sizing Formula

Here’s your cheat sheet for NEM 3.0 system sizing:

1. Annual usage: 10,000 kWh.
2. Target solar size: 8,000–9,000 kWh of production (80–90% of usage).
3. Battery size: 10–15 kWh (enough to cover 60–80% of your evening peak).
4. Self-consumption target: 70% or higher. Anything below 60% means you’re leaving money on the table.
5. Export cap: Never exceed 25% of your total production as export. If you do, you’re over-sized.

Example system for a typical California home:

• 6.5 kW solar array (16 panels at 400W each)
• 13.5 kWh battery (one Powerwall)
• Annual production: 9,100 kWh
• Annual self-consumption: 6,400 kWh (70%)
• Annual export: 2,700 kWh at $0.08 = $216 credit
• Annual grid purchases: 3,600 kWh at $0.40 = $1,440
• Net annual cost: $1,224 (vs. $4,000 without solar)

That’s a 70% reduction in your electric bill. And you didn’t waste a dime on overproduction.

Bottom Line

Under NEM 3.0, your solar system is a precision tool, not a blanket. Size it to your actual load profile. Prioritize self-consumption. Use a battery to shift your evening peak. And never, ever fill your roof just because the space is there. Your wallet will thank you.

Next Steps: Getting a Quote That Makes Sense

You’ve heard the warnings about NEM 3.0. You know the old days of exporting power for near-retail credit are gone. Now, you need a quote that actually reflects your real-world savings—not a salesman’s fantasy.

Here’s the hard truth: many installers are still pitching oversized solar-only systems that simply don’t pencil out under the new rules. A good NEM 3.0 proposal is fundamentally different from a NEM 2.0 proposal. If your quote doesn’t include a battery, or if the battery is an afterthought, walk away.

What to Ask Every Installer

Before you sign anything, get these three questions answered in writing.

1. “What is my self-consumption ratio, and how did you calculate it?” Under NEM 3.0, the value of your solar drops by 75% for every kilowatt-hour you export. The only way to win is to use what you make. A competent installer will model your hourly load profile against your solar production, not just your annual total. Ask for a month-by-month breakdown of how much solar you’ll use directly versus send to the grid. If they can’t provide that, they’re guessing.

2. “What is the usable battery capacity, not just the nameplate?” Battery marketing is full of tricks. A “13.5 kWh” battery might only have 11 kWh of usable capacity if you want to maintain its warranty. Ask for the usable kilowatt-hours at 100% depth of discharge, and ask what the round-trip efficiency is. A battery that loses 10% of its energy in conversion (like some older AC-coupled models) will cost you hundreds per year in lost savings.

3. “What happens to my net metering credits at the end of the year?” Under NEM 3.0, your annual true-up is brutal. Any excess credits left over are paid at a wholesale rate of roughly 2-4 cents per kWh—not the retail rate. Ask the installer to model a worst-case scenario where you have a large surplus. If they dodge the question, they’re hiding the downside.

How to Compare Proposals Like an Analyst

Stop comparing monthly payments. Start comparing these three numbers.

Cost per usable watt (solar only) Take the total system price (before tax credits) and divide it by the system’s DC wattage. A fair price in 2025 for a premium system (REC panels, Enphase microinverters) is around $2.80 to $3.20 per watt. Anything above $3.50 per watt needs a very good explanation. Avoid cheap panels—they degrade faster and hurt your 25-year savings.

Cost per usable kilowatt-hour of battery storage Divide the battery price (included in the total) by the usable kWh. For a Tesla Powerwall 3 (13.5 kWh usable), a fair price is around $850-$1,000 per usable kWh installed. For a FranklinWH or Enphase 5P, expect $1,000-$1,200 per usable kWh. If they’re quoting $1,500 per kWh, you’re paying a luxury tax.

Payback period with battery, not without Under NEM 3.0, a solar-only system might take 12-15 years to break even. A well-designed solar-plus-storage system should pay back in 6-9 years. Use the installer’s own numbers, but run them through a simple calculator. Divide the net cost (after 30% federal tax credit) by your annual electricity savings. If the result is over 10 years, the design is wrong.

Red Flags That Scream “Bad Quote”

Watch for these warning signs. They’re common in the post-NEM 3.0 market.

The “oversized solar” pitch Some installers will sell you a 12 kW system when you only need 8 kW. Their logic: “More panels mean more credits.” That’s a trap. Under NEM 3.0, excess power is worth pennies. You’re just overpaying for equipment you can’t use. A properly sized system covers 100-110% of your usage, not 150%.

The “zero-down” lease with a 4% escalator Leases sound easy, but read the fine print. Many include a 2.9% annual escalator on your payment. Over 20 years, that’s a 75% increase. Meanwhile, your electricity rates might only rise 3-4% per year. You end up paying more than you would have to the utility. Only consider a cash purchase, a loan, or a fixed-rate lease with no escalator.

Vague battery sizing If the installer says “one battery should cover you” without showing you your evening load profile, run. A typical California home uses 15-20 kWh between 4 PM and 9 PM. A single Powerwall (13.5 kWh) won’t cover that if you have an EV or a pool pump. You need a battery that matches your peak usage window, not just a “standard” size.

Ignoring the Non-Bypassable Charges (NBCs) Under NEM 3.0, you still pay about 2-3 cents per kWh on every kilowatt-hour you pull from the grid, even if you have net-zero usage. These are called Non-Bypassable Charges. A good quote will include them in your savings calculation. If the installer ignores them, they’re overstating your savings by 10-15%.

The One Number That Matters Most

Forget the “total system price.” Forget the “monthly savings.” Focus on the Net Present Value (NPV) over 25 years.

Ask the installer: “What is the NPV of this system, assuming a 6% discount rate and a 4% annual utility rate escalation?” A positive NPV means you’re making money. A negative NPV means you’re losing value compared to just paying the utility. A well-designed NEM 3.0 system should show an NPV of at least $10,000-$20,000.

If they can’t calculate NPV, they’re selling hardware, not savings. Find someone who can.

Your Final Checklist

Before you sign, verify these five things:

• The proposal includes a battery with at least 80% of your evening peak load covered
• The installer provided a month-by-month self-consumption analysis
• The payback period is under 9 years (after tax credits)
• The contract guarantees a minimum 10-year battery warranty with 70% capacity retention
• You have a clear path to add more battery capacity later (stackable units)

The NEM 3.0 market is full of noise. But the math is simple: use what you make, store the rest, and export only what you can’t shift. A quote that ignores that reality is a quote that costs you money. Get the right one, and you’ll lock in savings for decades.

Operational checklist before you commit

1. Review your current electricity bill to find your average monthly usage.
2. Get quotes from at least three installers who specialize in NEM 3.0 designs.
3. Ask each installer for a financial projection that includes battery storage and time-of-use rates.

Frequently asked questions

Is solar still worth it under NEM 3.0?

Yes, but only if you pair it with a battery. Without storage, your payback period jumps to 10–15 years. With a battery, you can still break even in 6–9 years.

Can I stay on NEM 2.0 after NEM 3.0 starts?

If you already have solar under NEM 2.0, you’re grandfathered in for 20 years. New applicants after April 2023 are on NEM 3.0.

Final takeaways

NEM 3.0 changes the game, but it doesn’t kill solar savings. You just need to plan differently. Batteries aren’t optional anymore—they’re essential.

Work with an installer who understands time-of-use rates and battery sizing. Your system should be built to match your actual usage, not just to max out production.