Understanding Net Metering: How You Earn from Solar

What Is Net Metering? The Simple Version

Let’s cut through the jargon. Net metering is the single most important policy that makes rooftop solar a profitable investment for you. Think of it as your personal energy bank account.

Here’s the core mechanic: You have one single meter that runs backward when your solar panels produce more electricity than your home is using, and forward when you pull power from the grid at night or on cloudy days. That’s it. No second meter. No complicated hardware. Just one spinning dial (or digital readout) that tracks the net difference.

How the “Backward Spinning” Works

Imagine it’s a sunny Tuesday at 2 PM. Your 8 kW solar system is cranking out 6.5 kW of power. Your home is only using 1.2 kW for the fridge, lights, and a laptop. That leaves 5.3 kW of surplus electricity.

Without net metering, that extra power is wasted or you need expensive batteries to store it. With net metering, that surplus electricity flows onto the utility grid, and your meter physically spins backward (or your digital meter subtracts from your total). You are now acting as a mini power plant, selling clean energy to your neighbors.

At 9 PM, your solar panels are idle. You’re running the TV, the microwave, and charging your EV. Your home draws 4 kW from the grid. Your meter spins forward, adding to your total. But here’s the magic: you’re using the credits you banked earlier in the day to offset that night-time consumption.

Banking Credits: Your Personal Energy Savings Account

This is where the financial logic clicks. Net metering doesn’t just zero out your bill—it creates a credit balance. Here’s the breakdown:

• Peak production hours (10 AM – 4 PM): Your meter runs backward, building a credit surplus. At 1:1 net metering, every kilowatt-hour (kWh) you export earns you a full retail credit.
• Off-peak / night hours: You spend those credits. The meter runs forward, but only against your accumulated balance.
• Monthly billing: Your utility calculates the net difference. If you exported 800 kWh but imported 600 kWh, you owe $0 for the electricity. You also have 200 kWh of credits to roll over.

Real-world example from my analysis of a typical California home:

Time Period	Solar Production (kWh)	Home Consumption (kWh)	Net Meter Reading	Credit Balance
6 AM – 10 AM	12	15	Forward +3 kWh	-3 kWh
10 AM – 4 PM	42	8	Backward -34 kWh	+31 kWh
4 PM – 10 PM	18	22	Forward +4 kWh	+27 kWh
10 PM – 6 AM	0	14	Forward +14 kWh	+13 kWh
Daily Total	72 kWh	59 kWh	Net: -13 kWh	+13 kWh credit

You ended the day with a 13 kWh credit. That’s free electricity to use tomorrow.

Why One Meter Matters More Than You Think

You might ask: “Why not just use two meters—one for import, one for export?” That’s a fair question. But one meter is the secret to simplicity and profit.

• Two meters = two sets of fees. Utilities often charge a monthly service fee per meter. One meter means one fee (typically $5–$15/month).
• One meter = instant offset. With a single bidirectional meter, your surplus power immediately cancels out your consumption. No waiting for a separate check from the utility.
• No time-of-day penalties. Under standard net metering, the credit you earn at 2 PM is worth the same as the power you use at 10 PM. You’re not penalized for shifting your usage.

The “Banking” Analogy in Plain Numbers

Think of your utility like a bank. You make deposits of solar energy during sunny hours. You make withdrawals at night. At the end of the month, the bank (utility) calculates your balance.

• Deposit: 1 kWh exported = 1 credit (worth roughly $0.10–$0.30 depending on your rate).
• Withdrawal: 1 kWh imported = 1 credit deducted.
• Rollover: Any unused credits carry into the next month. In many states, you can accumulate credits for up to 12 months.

Critical nuance: Most net metering policies reset your credit balance once per year, typically in March or April. This is called “true-up.” If you have leftover credits at true-up, some utilities pay you at a lower wholesale rate (around $0.03–$0.05/kWh), while others simply forfeit them. That’s why smart solar homeowners design their systems to produce roughly 100–110% of their annual usage—you want to zero out, not overproduce.

What Net Metering Is NOT

Let’s clear up three common misunderstandings:

1. It’s not “free electricity.” You still pay fixed grid connection fees ($10–$20/month in most areas). You’re only offsetting the variable energy charges.
2. It’s not a check in the mail. Unless you massively overproduce (which is financially dumb), you won’t get a cash payment. You get bill credits.
3. It’s not the same as a battery. A battery stores physical electrons. Net metering stores financial value of those electrons. For most homeowners, net metering is more cost-effective than a battery until battery prices drop below $200/kWh (they’re currently around $300–$400/kWh installed).

The Simple Bottom Line

Net metering turns your roof into a revenue-generating asset. Every sunny day, you’re building a credit balance that pays for your night-time usage. Your meter becomes a scoreboard: spinning backward = earning, spinning forward = spending.

For the typical homeowner, net metering alone can reduce your electric bill by 70–90% in the first year. That’s money you keep in your pocket, every single month, for the 25–30 year life of your solar system.

One last number: In states with strong net metering (like New York, Massachusetts, or Colorado), the average payback period on a solar investment drops from 12 years (without net metering) to just 5–7 years. That’s a 14–20% annual return on your investment—far better than the stock market’s historical average.

Your meter doesn’t care about politics or solar panel brand names. It only cares about the net flow of electrons. Give it more sunny-day exports than night-time imports, and you’ll win every single month. That’s net metering, plain and simple.

How You Actually Get Paid (or Credited)

Let’s cut through the jargon. When your solar panels generate electricity, you’re not literally cashing a check from the utility every month (unless you live in a rare market with direct cash payouts). Instead, you’re playing a credit game with your electric meter. Think of it like a bank account for kilowatt-hours (kWh). You deposit solar energy during the day, and you withdraw it at night or on cloudy days.

Here’s the real-world breakdown of how those credits flow, and more importantly, how they turn into actual savings or payments.

Monthly Netting: The 30-Day Scorecard

Your utility reads your meter every month. They compare two numbers: the energy you pulled from the grid (imports) versus the energy you pushed back (exports). The difference is your “net” usage.

• If you generate more than you use: Your meter spins backward. You build a credit balance. You pay only the minimum connection fee (usually $10–$20) that month.
• If you use more than you generate: You pay for the net difference at your regular retail rate.

Real-world example: Let’s say in July, your panels produce 900 kWh. Your home uses 700 kWh directly from the panels during the day, and you export 200 kWh back to the grid. At night, you pull 150 kWh from the grid. Your net usage for the month is: 150 kWh (imports) – 200 kWh (exports) = -50 kWh. You’re in the negative. You get a credit of 50 kWh for next month.

Your bill shows: $0 for electricity, plus a $15 connection fee. Total due: $15. Simple, right? But the real magic—or the headache—happens once a year.

Annual True-Up: The Settlement Day

This is where most homeowners get confused. Net metering doesn’t let you hoard credits forever. Once a year (usually on your anniversary month or a fixed date like March 31st), the utility zeroes out your account.

Scenario A: You used more than you produced over the year. You pay the difference at your standard retail rate. No drama. You just pay for what you used.

Scenario B: You produced more than you used over the year (a true surplus). This is where the fine print matters. And this is where the difference between retail-rate credits and wholesale buyback hits your wallet.

Retail-Rate Credits vs. Wholesale Buyback: The $1,000 Difference

Not all net metering is created equal. There are two distinct flavors, and your utility’s policy determines whether you get full value or pennies on the dollar.

Feature	Full Retail Net Metering (Best for You)	Wholesale / Net Billing (Utility-Friendly)
Credit value per kWh	Same as what you pay (e.g., $0.12/kWh)	Utility’s avoided cost (e.g., $0.03/kWh)
Annual surplus payout	Cash or credit at retail rate	Cash at wholesale rate (much lower)
Best for	Homes with high daytime usage	Homes with oversized systems or low usage
Typical in	~20 U.S. states (e.g., New York, Massachusetts)	States like California (NEM 3.0), Arizona

How Full Retail Net Metering works: You generate 10,000 kWh in a year, use 8,000 kWh, and export 2,000 kWh. At true-up, the utility owes you for those 2,000 kWh at your retail rate of $0.12/kWh. That’s $240 in cash or credit applied to your account. You effectively get paid the same price you’d pay to buy that energy. Fair.

How Wholesale Buyback works (Net Billing): Same numbers: 10,000 kWh generated, 8,000 used, 2,000 exported. But you’re only paid the utility’s “avoided cost”—what it would have cost them to generate that power from a gas plant. That’s often $0.03–$0.05/kWh. At $0.03/kWh, your 2,000 kWh surplus is worth just $60. You lose $180 compared to full retail net metering.

The hard truth: If you’re on a wholesale plan, you want to avoid exporting surplus. You’re better off shifting your usage to daytime (run the dishwasher, charge your EV at noon) or adding a battery to store that excess for evening use.

A Concrete Example with Numbers

Let’s walk through a full year for a typical 8 kW system in a state with full retail net metering.

Your system generates: 10,500 kWh/year. Your home uses: 9,000 kWh/year. Your direct self-consumption (solar power used instantly): 4,500 kWh. Your exports to grid: 6,000 kWh (10,500 – 4,500). Your imports from grid: 4,500 kWh (at night and cloudy days).

Monthly netting:

• Summer months (May–Sept): You export heavily. Your meter shows a growing credit balance. You pay $0 for electricity for 5 months straight, just the $15 connection fee.
• Winter months (Nov–Feb): Low solar production. You import more than you export. You pay for the net difference.

Annual true-up (April 1st): Your total imports for the year: 4,500 kWh. Your total exports for the year: 6,000 kWh. Net surplus: 1,500 kWh. Retail rate: $0.12/kWh. Your true-up credit: 1,500 × $0.12 = $180.

You get a check for $180, or a credit applied to your next bill. Plus, you saved $540 by directly using 4,500 kWh of solar instead of buying it from the grid (4,500 × $0.12). Total annual benefit: $720.

What Happens If You Have a Battery?

A battery changes the math entirely. Instead of exporting surplus at 3 PM, you store it and use it at 8 PM. You reduce your imports to near zero. Your annual surplus shrinks or disappears. That’s actually better under wholesale net billing because you avoid the low-value payout.

Example with battery (wholesale market):

• Without battery: 2,000 kWh exported at $0.03 = $60 credit.
• With battery: You store 1,800 of those kWh and use them at night. You only export 200 kWh. Your credit drops to $6. But you also avoided buying 1,800 kWh from the grid at $0.12/kWh. That’s $216 in savings. Total benefit: $222 instead of $60.

The bottom line: Your payment or credit depends entirely on your utility’s policy and your energy habits. If you have full retail net metering, oversize your system and profit. If you have wholesale buyback, match your production to your consumption or add a battery. Either way, you’re earning—you just have to know which game you’re playing.

The Hidden Rules That Affect Your Earnings

Net metering sounds simple: your panels send power to the grid, you get credits. But utilities have layers of fine print that can quietly slash your returns. These aren't conspiracy theories—they're policy traps that catch thousands of homeowners every year. Let me walk you through the four biggest ones.

System Size Caps: The Ceiling Nobody Tells You About

Most states cap how large your solar system can be under net metering. Typical limits range from 10 kW to 25 kW for residential systems. Go over that, and you fall into a different tariff—often paying wholesale rates for your excess power instead of retail.

Here's the kicker: the cap is usually based on your annual electricity consumption, not your roof space. If your home uses 10,000 kWh per year, a 7 kW system is about right. But if your utility caps you at 110% of your historical usage, you can't oversize to future-proof for an electric car or heat pump.

What to check before signing:

• Your state's net metering cap (find it on your utility's tariff sheet)
• Whether the cap applies to AC output or DC panel capacity (they're different)
• If you can get a pre-approval letter guaranteeing your system size

One homeowner in Colorado ignored this. He installed a 12 kW system on a home that only used 9,000 kWh annually. His utility rejected net metering for the extra 2 kW, paying him just $0.03/kWh instead of $0.12/kWh. That's a 75% pay cut on his surplus energy.

Enrollment Limits: The Clock Is Ticking

Net metering programs often have enrollment caps. Once a certain percentage of the utility's peak load is met by solar, the program closes to new applicants. Some utilities hit this cap within months.

Take Hawaii in 2015. The program filled up, and new solar customers were pushed onto a "customer self-supply" tariff that paid zero for excess energy. You had to pair your panels with a battery or lose your surplus entirely.

Recent examples of enrollment limits:

State	Utility	Cap Reached	What Changed
California	PG&E, SCE, SDG&E	NEM 2.0 capped at 5% of peak load (hit in 2022)	New NEM 3.0 pays ~75% less
Massachusetts	Eversource	7% cap hit in 2023	New customers get lower export rates
Arizona	APS	6% cap triggered in 2020	Grandfathered customers keep old rates for 20 years

Your move: Ask your installer for the utility's current enrollment status. If they can't tell you the exact percentage filled, walk away. You need to know if you're racing a deadline.

Time-of-Use Rate Requirements: The Clockwork Trap

Many net metering programs now require you to be on a time-of-use (TOU) rate plan. This means the value of your credits changes by the hour. Export power at 2 PM on a sunny Tuesday? You might get $0.08/kWh. Export at 6 PM during a heatwave? That same kWh could be worth $0.40/kWh.

The problem? Most solar panels produce peak power between 10 AM and 3 PM—when rates are lowest. Your home's biggest energy use is often 4 PM to 9 PM, when rates are highest and your panels are winding down.

Real numbers from a California homeowner:

• System size: 8 kW
• Annual production: 11,000 kWh
• Under old flat-rate net metering: $1,320 in annual credits
• Under TOU net metering (NEM 2.0): $980 in annual credits
• Loss: $340 per year, or 26%

How to protect yourself:

• Ask your installer for a TOU-specific production estimate, not just total kWh
• Consider a battery to shift your solar power to evening hours
• Check if your utility offers a "grandfathering" period before forcing you onto TOU

What Happens If Your Utility Changes the Rules Mid-Contract

This is the scariest pitfall. Net metering isn't a contract—it's a tariff. Utilities can change it with regulatory approval. And they do.

Currently, 28 states have seen net metering policy changes in the last five years. Some protect existing customers for 20 years. Others give you just 90 days' notice.

The three levels of protection:

1. Grandfathering (best): You keep your current net metering rates for 15-20 years. California's NEM 2.0 customers are grandfathered for 20 years. Nevada used to have this, then changed it.
2. Transition period (moderate): You get 5-10 years of current rates, then switch. Hawaii gave existing customers 5 years.
3. No protection (worst): Your rates can change at any time. Some Texas utilities have no grandfathering clause.

The Nevada nightmare (2015-2017):

• Existing solar customers had their net metering rates slashed retroactively
• Monthly bills jumped from $20 to $90+
• Thousands of homeowners sued. The policy was eventually reversed, but it took two years of legal battles
• Some families sold their homes at a loss because the solar system was now a liability

How to check your protection:

• Read your interconnection agreement—look for "grandfathering period" or "rate stability clause"
• Ask your installer: "If the utility changes net metering tomorrow, what happens to my credits?"
• Check your state's net metering statute. Some states like New York and Massachusetts mandate 20-year grandfathering

The Bottom Line on Hidden Rules

You're not just buying solar panels. You're entering a complex regulatory dance with your utility. The system size, the enrollment clock, the time-of-day pricing, and the grandfathering terms all determine whether you earn $15,000 or $5,000 over the next decade.

Here's your checklist before signing anything:

• System size is within 110% of your annual usage
• Your utility's net metering program is still open (check the enrollment percentage)
• You understand how TOU rates affect your specific production profile
• Your interconnection agreement specifies a grandfathering period of at least 15 years
• You have a written estimate showing net metering credits under current AND proposed future rates

If your installer can't answer these four questions with hard numbers, you're not ready to install. The hidden rules don't have to be traps—but only if you know where they're hiding.

Net Metering vs. Solar Batteries: Which Is Better?

Let’s get straight to the point: net metering and solar batteries serve two very different financial masters. One maximizes your savings. The other maximizes your control. You need to know which one puts more money back in your pocket—and when the other is worth the premium.

The Core Financial Difference

Net metering pays you the full retail rate for every kilowatt-hour (kWh) you push back to the grid. That’s typically $0.10 to $0.35 per kWh, depending on where you live. You’re essentially using the grid as a free, 100% efficient battery. No equipment cost. No degradation. No maintenance.

A solar battery, on the other hand, stores your excess energy at home. But you lose about 10-15% of that energy in the charge-discharge cycle. And you paid $8,000 to $15,000 upfront for the privilege. When you discharge that battery at night, you’re using energy you already generated—but you’re not selling it back at full retail price. You’re just avoiding buying electricity at the retail rate.

Here’s the blunt math: if your utility offers full 1:1 net metering, a battery rarely pays for itself on energy arbitrage alone. You’d need a grid outage to justify it.

When Net Metering Wins (The No-Brainer Scenario)

You should almost certainly skip the battery if:

• Your utility pays full retail credit for exported solar (1:1 net metering)
• Your grid is reliable (less than one 4-hour outage per year)
• Your goal is the shortest payback period (typically 6-9 years with net metering alone)

In this case, every solar panel you own is a revenue-generating asset. You sell high (daytime), buy low (nighttime). The grid handles the storage for free. Your solar system’s value is maximized because you never “waste” a single kWh.

Real-world example: A homeowner in California with NEM 2.0 (full 1:1 net metering) can expect a 7-year payback. Adding a $12,000 battery pushes that to 12-14 years, unless they use it for backup.

When a Battery Beats Net Metering (The Independence Play)

Now flip the script. You live in a state where net metering is being gutted. You’re down to 70% retail credit, or you’re on a time-of-use (TOU) plan where peak rates hit $0.50/kWh. Suddenly, a battery changes the game.

Here’s how you win with a battery:

• Time-of-use shifting: Charge the battery during cheap midday solar production. Discharge during peak evening hours when power costs $0.40-$0.60/kWh. You’re effectively buying low and selling high—inside your own home.
• Avoiding demand charges: If you’re on a commercial or residential demand rate (common in Texas, Arizona, parts of the Midwest), a battery can shave your peak demand spike. That can save $50-$200 per month alone.
• Outage protection: If your area sees 2-3 grid outages per year lasting 6+ hours, a battery is an insurance policy. The average cost of food spoilage alone during a 12-hour outage is $200-$500. A battery prevents that.

The math shifts: In a low net metering state like Arizona (where credits drop to $0.03/kWh after 2025), a battery can boost your solar ROI by 30-50% compared to exporting to the grid.

The Hybrid Reality: Can You Have Both?

Yes. And many homeowners do. But you need to be strategic.

You can pair net metering with a battery, but you lose some grid credit. Here’s why: every kWh you store in a battery is a kWh you don’t export at full retail price. You’re trading a guaranteed credit for potential future savings.

The sweet spot? Use the battery only for backup and TOU shifting. Let the grid handle the bulk of your excess energy during the day. Program your battery to discharge during peak rate hours (4-9 PM) when net metering credits are lowest. That way, you capture the best of both worlds.

Typical hybrid setup:

Component	Function	Financial Impact
Solar panels	Generate daytime energy	Full retail export during off-peak
Battery	Store excess for peak use	Avoids $0.40-$0.60/kWh peak rates
Grid	Backup for battery depletion	Pays $0.10-$0.15/kWh for leftover exports

The Decision Matrix: Which Path Is Yours?

Let’s make this concrete. Answer these three questions:

1. What does your utility pay for exported solar?

   • Full retail (1:1)? → Net metering wins.
   • 50-80% retail? → Battery starts to look good.
   • Near wholesale ($0.02-$0.05/kWh)? → Battery is almost mandatory.

2. How often does your power go out?

   • 0-1 times per year, <2 hours each → Skip the battery.
   • 2-4 times per year, 4-8 hours each → Consider a small battery (5-10 kWh).
   • 5+ times per year or >12 hours each → Invest in a large battery (15-20 kWh).

3. Do you have time-of-use rates with a big peak/off-peak gap?

   • Gap <$0.10/kWh → Battery won’t pay back.
   • Gap $0.20-$0.30/kWh → Battery pays back in 7-10 years.
   • Gap >$0.40/kWh → Battery pays back in 4-6 years.

The Verdict: No Single Right Answer

Here’s the honest truth: net metering is the most efficient financial tool for most homeowners today. It’s simple, cheap (free), and maximizes your solar returns. But it’s only as good as your utility’s policies—and those are changing fast.

Batteries are the insurance policy against those changes. They protect you from rising rates, shrinking credits, and grid instability. The cost is real, but so is the peace of mind.

My recommendation: If you have 1:1 net metering and reliable grid power, install solar now and skip the battery. Revisit the battery decision in 3-5 years when prices drop another 30-40%. If you face low net metering credits or frequent outages, a battery isn’t optional—it’s the key to making solar work for you.

Choose based on your utility rates and your risk tolerance. Not on marketing hype. Your wallet will thank you.

3 Questions to Ask Before You Sign a Solar Contract

You’ve done the research. You’ve seen the ads. A sales rep is sitting in your living room, telling you how much you’ll save. But here’s the cold truth: the financial math of your solar system hinges on one thing—your utility’s net metering policy. If you sign without asking the right questions, you could be locking yourself into a 20-year contract that pays you pennies instead of dollars.

Let’s cut through the noise. Before you put pen to paper, you need answers to three specific questions. These aren’t just nice-to-knows. They determine whether your solar investment earns 15% annual returns or leaves you with a bill at the end of the year.

Question 1: “Does my utility offer net metering at the full retail rate?”

This is the single most important financial variable in your solar contract. Net metering at the full retail rate means every kilowatt-hour (kWh) you send to the grid is credited at the same price you pay to buy electricity. That’s typically $0.10 to $0.30 per kWh, depending on your state and utility.

Here’s why this matters: If your utility pays you the retail rate, your payback period shrinks. A typical 7.5 kW system in California (retail rate ~$0.30/kWh) can pay for itself in 5-7 years. If your utility offers only wholesale or avoided-cost rates—say $0.03 to $0.05 per kWh—that same system might take 12-15 years to break even.

Ask your solar installer for a direct answer. Don’t accept “it depends.” Push for a yes or no. If they dodge, that’s a red flag.

What to look for in your contract:

• Does the contract assume retail-rate net metering in its savings projections?
• Is there a clause that shifts risk to you if the utility changes its policy?
• Does the installer guarantee a minimum credit rate?

Real-world trap: In 2023, California transitioned to Net Billing Tariff (NBT), which pays solar owners roughly $0.08/kWh for exports—far below the retail rate of $0.30+. Thousands of homeowners signed contracts in 2022 based on old rates. Their projected savings dropped by 50-70%. Don’t be that person.

Question 2: “Is there a cap on system size for net metering eligibility?”

Your utility might love small solar systems. But they’ll punish oversized ones. Most utilities cap net metering eligibility at 100% to 120% of your historical annual consumption. If your system produces more than that, the utility either pays you nothing for excess power or drops you into a lower compensation tier.

Here’s the math:

• You used 10,000 kWh last year.
• You install a 10 kW system that produces 13,000 kWh per year.
• Your utility caps net metering at 100% of usage.
• Result: You get retail credit for 10,000 kWh. The remaining 3,000 kWh? You might get paid $0.02/kWh or nothing at all.

That’s a $600 to $900 annual loss on a typical system.

Questions to ask your installer:

• “What’s my exact annual consumption for the last 12 months?”
• “What system size are you proposing, and how does it compare to my usage?”
• “If I choose a larger system, what happens to the extra production?”

Pro tip: Some utilities allow you to “true up” every 12 months. Others have monthly caps. Ask your installer to model both scenarios. If the sales rep can’t show you a spreadsheet with these numbers, walk away.

State-by-state reality check:

State	Typical Net Metering Cap	Excess Compensation
New York	100% of usage	Retail rate (rarely)
Texas	Varies by utility	Wholesale rate ($0.03-0.05)
Florida	115% of usage	Avoided cost ($0.02-0.04)
Arizona	100% of usage	Wholesale rate ($0.03)
Massachusetts	100% of usage	Retail rate (until cap hit)

If you’re in a state with low excess compensation, oversizing is a financial mistake. Stick to 90-100% of your current usage. You can always add panels later if your consumption grows.

Question 3: “What happens to my net metering credits at the end of the year?”

This is the hidden trap in most solar contracts. Your utility might give you credits for excess power month-to-month, but at the end of the 12-month billing cycle, many utilities reset your balance to zero. That means any unused credits—worth real money—simply vanish.

The two common scenarios:

Scenario A: Annual true-up with cash-out. Some utilities (like in New Jersey or Massachusetts) pay you for leftover credits at the end of the year. You might get a check for $200-$500. That’s a nice bonus.

Scenario B: Annual true-up with forfeiture. Many utilities (like in California under NBT, or parts of Texas) zero out your credits. No check. No carryover. Your extra summer production disappears.

Why this matters for your contract: If your installer’s savings projection assumes you’ll use 100% of your credits, but you actually end up with a surplus, you’ll lose money. This is especially common if you:

• Install more panels than you need.
• Have a seasonal home (e.g., you’re away in summer when production peaks).
• Plan to buy an electric car later (but haven’t yet).

Ask your installer these specific questions:

• “What is the utility’s annual true-up policy? Cash-out or forfeiture?”
• “If credits are forfeited, how does that change my projected savings?”
• “Can I choose a smaller system to avoid surplus credits?”

Real-world example: A homeowner in Arizona installed a 9 kW system for a house that used 8,000 kWh annually. Their utility caps net metering at 100% and forfeits credits annually. They ended up with 2,000 kWh in unused credits—worth about $240—every year. That’s $4,800 over 20 years. The installer never mentioned it.

Your action plan:

• Call your utility directly. Ask for the net metering policy in writing.
• Ask for the “annual true-up” section specifically.
• Get the answer in an email. Save it. If the installer’s projections don’t match, you have proof.

The Bottom Line for Your Solar Contract

Your solar contract is a financial instrument. Treat it like one. The three questions above aren’t optional—they’re the difference between a smart investment and a costly mistake.

Here’s a quick checklist to take to your next meeting:

• Does my utility offer retail-rate net metering? (Yes/No)
• What is the system size cap? (____ kWh or ____% of usage)
• What happens to credits at year-end? (Cash-out / Forfeit / Rollover)

If the sales rep can’t answer each one with a clear, written answer—or if they try to “explain” without giving you a number—stand up and leave. There are plenty of reputable installers who will give you straight answers.

Your solar system should work for you, not the utility. Asking these three questions is the first step to making sure it does.

Operational checklist before you commit

1. Confirm your utility offers net metering and at what rate (retail vs. wholesale).
2. Review your current electricity usage pattern to size your system correctly.
3. Ask your installer about any cap on system size or enrollment limits.

Frequently asked questions

What happens if I produce more solar power than I use in a month?

Your utility credits those extra kilowatt-hours to your account. Those credits roll over month to month and typically offset future usage or are paid out annually at a lower rate.

Can I still use net metering if I add a battery?

Yes, but how credits are handled changes. Batteries let you store excess power for evening use, which reduces the amount you send to the grid. Some utilities have separate rate plans for solar-plus-storage.

Final takeaways

Net metering is one of the biggest financial perks of going solar. It turns your roof into a mini power plant that pays you back every month.

But the rules aren’t the same everywhere. Know your utility’s policy, size your system right, and you’ll maximize your savings without surprises.