⚡ Free Net Metering Savings Calculator — Self-Consumption Split + NEM 3.0 + Monthly True-Up

Net Metering Savings Calculator — Self-Consumption vs. Export Split, Full Retail NEM vs. NEM 3.0 Net Billing Tariff vs. Avoided Cost, Monthly Seasonal Production, Annual True-Up Credit Banking, and 10-Year Savings Projection

The only net metering calculator separating what you self-consume (valued at full retail rate) from what you export (valued at your utility’s net metering policy rate), with monthly seasonal production variation, annual credit rollover banking, and a 10-year savings table showing how rising electricity rates increase your solar savings every year.

⚡ Net Metering Savings Calculator

Step 1 — Your Solar System
kW
hrs
kWh/yr
Leave Annual kWh as 0 to auto-calculate from system size x peak sun hours x 365. Or enter your installer’s production estimate directly.
Step 2 — Net Metering Policy
Every exported kWh credited at full retail rate. Most states.
Step 3 — Self-Consumption & Home Usage
%
Typical self-consumption: 30-50% for most households (during work hours, AC/EV charging reduces this). Higher self-consumption = greater savings since self-used kWh is valued at full retail regardless of NEM policy. With battery storage: 70-90% self-consumption is achievable.
kWh/yr
$/kWh
%/yr
EIA data: US retail electricity prices rose an avg of 3.2%/yr from 2014-2024. In states like CA and NY, the rate was 4-6%/yr. Enter 0 for a conservative flat-rate estimate.

📈 Net Metering Savings Results

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Enter your system size, net metering policy, self-consumption rate, and electricity rate — then click Calculate Net Metering Savings for monthly savings, annual true-up, and 10-year projection.

Net Metering Savings Calculator — The Critical Difference Between Self-Consumption and Exporting Solar Power

Every solar homeowner needs to understand one fundamental distinction that most net metering calculators get completely wrong: a kilowatt-hour you consume yourself is worth more than a kilowatt-hour you export to the grid — sometimes dramatically more. When your solar panels produce electricity while you’re home running the AC, dishwasher, or EV charger, that self-consumed electricity replaces power you would have bought at full retail ($0.13-0.35/kWh depending on state). But when your panels produce excess power at noon while you’re at work, that exported electricity is only credited at whatever your utility’s net metering rate is — which could be as low as $0.04/kWh under California’s NEM 3.0 Net Billing Tariff.

The difference in savings is not trivial. A 10 kW system in California producing 14,000 kWh/year under NEM 2.0 (full retail credits) generated approximately $1,820 in annual savings. The same system under NEM 3.0 (export credits around $0.05/kWh) with 40% self-consumption generates approximately $800 in annual savings — a 56% reduction in solar value. Understanding your self-consumption rate and net metering policy is therefore the single most important variable in calculating your real solar savings.

How this calculator works: Step 1 — Calculate monthly solar production using seasonal factors (summer months produce ~77% more than winter months at US average latitude). Step 2 — Split each month’s production into self-consumed kWh (valued at full retail rate) and exported kWh (valued at your net metering policy rate). Step 3 — Calculate your monthly net electricity bill after applying self-consumption savings and export credits. Step 4 — Bank excess credits to apply in future months (winter solar often doesn’t cover the monthly bill; summer credits bank forward). Step 5 — Project 10 years with electricity rate escalation to show total cumulative savings.

US Net Metering Policy Comparison — Full Retail NEM vs. NEM 3.0 vs. Avoided Cost

Policy TypeExport Credit RateStates / UtilitiesImpact on 8 kW System (3% self-consumption)
Full Retail NEM (NEM 1.0 / 2.0)Full retail rate (~$0.13-0.35/kWh)Most US states — TX (some), NY, NJ, MA, CO, AZ, NV, IL, NC, most others$1,200-2,500/yr savings depending on state retail rate
CA NEM 3.0 / Net Billing TariffAvoided Cost: ~$0.04-0.08/kWh for exports (vs. retail ~$0.30 SCE)California: PG&E, SCE, SDG&E (systems installed after Apr 15, 2023)Dramatically reduced export value — battery storage becomes essential to shift export to peak TOU hours
Avoided Cost / Wholesale$0.03-0.08/kWhFlorida Power & Light, Duke Energy Florida, Georgia Power, some TX co-opsExport value is 25-60% lower than retail — self-consumption becomes critical
Buy-All / Sell-AllWholesale rate ($0.03-0.06/kWh)Some rural electric cooperatives, Dominion (some markets)All solar sold to utility at wholesale; all consumption purchased at retail — often poor economics
Virtual Net MeteringRetail or avoided costCommunity solar in MA, NY, IL, CO, MNCredits appear on bill without rooftop installation — varies widely by program

Three Real US Net Metering Savings Examples

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Example 1: Austin, TX — 9 kW System, Avoided Cost Net Metering, Flat Rate

Austin, Texas — Austin Energy avoided cost net metering, 5.2 peak sun hours, flat rate

An Austin homeowner installs a 9 kW solar system. Austin Energy uses an avoided cost net metering structure: self-consumed kWh saves the full retail rate ($0.109/kWh), but exported kWh is only credited at Austin Energy’s “Value of Solar” tariff (~$0.097/kWh — actually better than most avoided cost utilities). Annual home usage: 14,400 kWh. Self-consumption: 40%.

ComponentCalculationAnnual Value
Annual production9 kW x 5.2 hrs x 36517,082 kWh
Self-consumed (40%)6,833 kWh x $0.109/kWh retail$745
Exported (60%)10,249 kWh x $0.097/kWh VOS$994
Annual pre-solar bill14,400 kWh x $0.109/kWh$1,570
Annual savings$745 + $994 (net)~$1,350/yr
Bill reduction$1,350 / $1,570~86%
Austin Energy note: Austin Energy’s “Value of Solar” (VOS) tariff is actually more favorable than typical avoided cost because it includes the full societal value of solar (capacity, energy, environment). Current VOS rate is updated annually. Check Austin Energy’s current rate at austinenergy.com. The Texas PUC maintains statewide net metering policy information at puc.texas.gov.
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Example 2: San Diego, CA — 7 kW System, NEM 3.0 Net Billing Tariff, High Retail Rate

San Diego, California — SDG&E NEM 3.0 (post Apr 2023), $0.44 retail rate, high self-consumption

A San Diego homeowner installed 7 kW solar in June 2023, falling under NEM 3.0. SDG&E’s export credit rate is approximately $0.08/kWh on average across the day. The homeowner also has a Tesla Powerwall for battery storage, boosting self-consumption to 75%. SDG&E retail rate: $0.44/kWh (some of the highest in the US). Annual usage: 10,000 kWh.

ScenarioSelf-ConsumptionAnnual SavingsBattery Impact
No battery (NEM 3.0)35% self-use~$1,350/yrBaseline
With Powerwall (NEM 3.0)75% self-use~$2,450/yr+$1,100/yr extra savings
NEM 2.0 (for comparison)35% self-use~$3,100/yrNEM 3.0 cut savings by 56%
San Diego / NEM 3.0 note: California’s NEM 3.0 reduced the value of solar exports dramatically. The CPUC’s official NEM 3.0 decision and the Avoided Cost Calculator (ACC) rate schedule that determines export credits are available at cpuc.ca.gov/nem. The key takeaway: under NEM 3.0, adding a home battery (Tesla Powerwall, Enphase IQ Battery, Franklin WH) dramatically increases savings because it lets you self-consume or export during peak TOU hours (4-9 PM) when export credits are worth 3-5x more. The $13,000 battery at the 30% federal ITC = $9,100 net cost often pays back in 5-7 years in SDG&E territory.
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Example 3: Burlington, VT — 6 kW System, Full Retail NEM, Net Metering with Annual True-Up

Burlington, Vermont — Green Mountain Power full retail NEM, 3.8 peak sun hours, cold winter months

A Burlington homeowner installs 6 kW solar. Vermont has full retail net metering through Green Mountain Power. The key challenge: Vermont has extreme seasonal variation — July produces 3x more solar than December. Annual home usage: 9,500 kWh. Self-consumption: 40%.

SeasonMonthly SolarMonthly BillCredits Banked
Peak summer (June-Aug)~775 kWh/mo~$0-5/mo~$120-150/mo banked
Shoulder (Apr-May, Sep-Oct)~600 kWh/mo~$20-40/moSmall bank
Deep winter (Dec-Jan)~325 kWh/mo~$80-100/moDrawing from bank
Annual true-up (April)Unused annual credits typically expire or paid at avoided cost — net metering credit bank resets annually
Vermont note: Green Mountain Power offers one of the best net metering programs in New England — full retail credit for all net excess generation, with monthly rollover of credits. Vermont’s net metering statute and current rules are administered by the Vermont Public Utility Commission at puc.vermont.gov. Vermont’s net metering cap (15% of peak load per utility) has been debated, but Green Mountain Power has been supportive of distributed solar. EIA data at eia.gov confirms Vermont’s seasonal production variation and average electricity rates.

Three Expert Tips for Maximizing Net Metering Savings

1

Maximize Self-Consumption — It’s Worth Full Retail Regardless of Your NEM Policy

Under every net metering policy in the US, electricity you consume directly from your solar panels is valued at the full retail rate — because it directly replaces grid electricity you would have paid for. Even under California’s NEM 3.0 where export credits are only $0.04-0.08/kWh, self-consumed solar is worth $0.30-0.44/kWh (SDG&E’s retail rate). Shift your high-consumption activities to daylight hours: run dishwashers, laundry, and pool pumps between 10 AM and 4 PM. Program your EV to charge at noon. Set your water heater to pre-heat during peak solar hours. Each kWh you shift from evening (grid) to midday (solar) directly increases the financial return on your system.

2

Understand Your Annual True-Up Before Sizing Your System

Most utilities process net metering credits with a monthly bill rollover — you accumulate credits in summer and draw them down in winter. But virtually every utility resets the credit bank annually (usually in April or at your anniversary month), and any remaining unused credits are typically paid out at avoided cost or simply expire. This means a dramatically oversized system wastes credits. The optimal system size for net metering is one that produces approximately 95-110% of your annual consumption — producing just enough to cover the year, not generating excess that goes uncompensated at annual true-up. Check your utility’s exact true-up policy before system sizing. California utilities describe their NEM true-up process at cpuc.ca.gov/nem.

3

Under NEM 3.0, Battery Storage Changes the Math Completely

California’s NEM 3.0 reduced the value of solar exports by up to 75% compared to NEM 2.0. But it also created a powerful incentive for battery storage. Under NEM 3.0’s Time-of-Use rates, exporting electricity between 4-9 PM (peak hours) earns significantly more than exporting at noon. A home battery system like the Tesla Powerwall or Enphase IQ Battery can charge from your solar panels during the day and then export during the peak evening TOU window — or power your home during peak hours to avoid buying expensive peak electricity. The combined 30% federal ITC now applies to standalone batteries (since IRA 2022), making battery economics much more favorable. SDG&E, PG&E, and SCE customers on NEM 3.0 should model both solar-only and solar-plus-battery scenarios before installation.

Frequently Asked Questions About Net Metering Savings

What is net metering and how does it work?+
Net metering is a billing arrangement where your utility credits you for excess electricity your solar panels send to the grid. When your panels produce more than you need, the excess flows to the grid and your meter spins backward (or in modern systems, your utility logs a credit). When you use more than your panels produce (nights, cloudy days, winter), you draw from the grid and use your banked credits to offset the cost. Under full retail net metering (NEM 1.0/2.0), each kWh you export is credited at the same price as the retail rate you pay for grid electricity. Under NEM 3.0 or avoided cost policies, export credits are lower than retail. The DSIRE database at dsireusa.org tracks net metering policies for every US state and utility.
What is the difference between NEM 2.0 and NEM 3.0 in California?+
California’s NEM 2.0 credited solar exports at the full retail rate (approximately $0.30-0.44/kWh depending on the utility), making solar very economical. NEM 3.0, which took effect April 15, 2023 for new solar applications, replaced retail-rate export credits with a much lower “Avoided Cost Calculator” (ACC) rate that averages $0.04-0.08/kWh — a reduction of 75-87% in export credit value. For systems installed after April 15, 2023, the economics of solar without battery storage are significantly reduced. Existing NEM 2.0 customers keep their NEM 2.0 rate for 20 years from their original interconnection date. The California PUC’s official NEM 3.0 decision is at cpuc.ca.gov/nem.
What is a good self-consumption rate for solar?+
Self-consumption rate — the percentage of your solar production you use directly rather than export — varies significantly. Typical ranges: Work-from-home households: 50-65% (people home during peak solar hours). Standard working family (away 8am-6pm): 25-40%. With time-of-use load shifting (running appliances during solar hours): 40-55%. With an EV charging at home during day: 50-70%. With home battery storage: 70-90%. Under full retail NEM, self-consumption rate matters less because exports are worth the same as retail. Under NEM 3.0 or avoided cost policies, every 10% improvement in self-consumption can meaningfully increase your annual savings — sometimes by $300-500/yr for a typical system.
How does the annual true-up work?+
Most net metering utilities allow you to bank excess credits month-to-month throughout the year. In summer, your panels may produce far more than you use, building up a large credit balance. In winter, your production drops and you draw down that credit bank to offset higher bills. Once per year (typically in April, or on the anniversary of your interconnection date), your utility performs an “annual true-up.” At true-up, any remaining unused net excess generation credits are typically paid out at a lower rate (avoided cost or a few cents per kWh) — or in some cases, the credits simply expire. True-up policies vary significantly by utility. Always check your utility’s specific net metering tariff at DSIRE: dsireusa.org.
Do all US states have net metering?+
As of 2024, 40+ states plus DC have mandatory net metering rules for investor-owned utilities. States with strong full retail NEM: New York, New Jersey, Massachusetts, Colorado, Nevada, New Mexico, Illinois, North Carolina, many others. States with avoided cost or reduced NEM: Florida (avoided cost at most utilities), Texas (no statewide mandate, utility-specific), Georgia (avoided cost), California (NEM 3.0 for new systems). Some states have NEM caps — once a utility reaches a certain percentage of peak load from distributed solar, they can modify their net metering program. States without mandatory NEM: Idaho, Mississippi, South Dakota, Tennessee. Tennessee Valley Authority and the rural electric cooperatives that it serves have their own limited net metering-like programs. The DSIRE database at dsireusa.org is the most comprehensive source for current state-by-state net metering status.
Why does solar production vary so much by month?+
Solar production varies seasonally for two reasons: day length and sun angle. In summer, the US has 14-16 hours of daylight versus 8-10 in winter. The sun angle is also much higher in summer, meaning sunlight hits panels more perpendicularly (more efficiently) rather than at the oblique angles of winter. At US average latitude (approximately 38 degrees North), December typically produces about 52-60% of what July produces. This seasonal variation is why net metering’s credit banking feature is so important — summer overproduction credits fund winter shortfalls. In states without credit rollover (where each month stands alone), under-sized systems may not save as much in winter because there are no credits to draw on. NREL’s PVWatts at pvwatts.nrel.gov gives exact monthly production estimates for your address.
How does a battery storage system affect net metering savings?+
Battery storage affects net metering savings in two ways. First, it increases self-consumption: instead of exporting midday solar production to the grid at (possibly low) export rates, you store it in the battery and use it in the evening at full retail value. Second, under Time-of-Use (TOU) rate structures, a battery can export electricity during peak hours (typically 4-9 PM) when export credits are worth more — or avoid buying expensive peak-hour grid electricity. Under California NEM 3.0 specifically, battery storage typically increases annual savings by $800-1,500/yr compared to solar-only because it transforms a low-value export into a high-value self-consumption or peak-hour export. The 30% federal ITC now applies to standalone batteries (under IRA 2022), reducing battery cost by 30%.
What electricity rate should I use in this calculator?+
Use your average effective rate per kWh — your total electricity bill divided by total kWh used. This is often different from your advertised “rate” because utility bills include fixed charges, distribution charges, and other fees that don’t scale with kWh. Find your effective rate by: taking your last 12 months of bills, adding up total charges (excluding taxes on certain fixed fees), and dividing by total kWh used. Average US residential rate in 2024: $0.133/kWh (EIA). High-rate states: CA ($0.28-0.44), HI ($0.38-0.44), MA ($0.25), CT ($0.28). Low-rate states: LA ($0.097), AR ($0.098), OK ($0.10). EIA maintains current state-by-state rates at eia.gov/electricity/state.

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Legal Disclaimer and Editorial Transparency

Net metering savings estimates are for informational planning purposes only and are not a guarantee of utility bill savings. Actual savings depend on your utility’s specific net metering tariff, rate structure, interconnection agreement, TOU pricing schedule, and the actual production of your installed system. Net metering policies change frequently — always verify current net metering rules with your utility and/or the DSIRE database at dsireusa.org before making solar investment decisions. California NEM 3.0 export rates (Avoided Cost Calculator) are set by the California PUC and updated periodically at cpuc.ca.gov/nem. Monthly production seasonal factors are based on NREL PVWatts US average data; your actual monthly production will vary by location, roof orientation, and weather. USCalculators.com is not affiliated with any utility, solar installer, or government energy agency.