Net Metering Savings Calculator
Calculate annual net metering savings, true-up balance, and 25-year value for any US state. Models TOU rates, self-consumption, and export credits. Free, no signup.
Net Metering Savings Calculator
Select your state and utility, enter system size and annual usage. Get monthly bill before and after solar, annual net metering credit, offset percentage, and 25-year savings.
Enter your system details to see net metering savings, true-up simulation, and credit analysis
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What This Tool Covers
Net metering policies vary by state, utility, and tariff type - and the difference between full retail credit, avoided-cost billing, and no net metering can swing a system's 25-year value by tens of thousands of dollars. This calculator models annual savings, true-up balances, and long-term projections under the policy that actually applies to a customer's address.
Calculator Inputs
Enter system specifications, location, and rate data to model savings under the applicable net metering policy.
- State, system size (kW), and annual production (kWh)
- Annual home usage (kWh), retail rate, and export credit rate
- Self-consumption rate (slider), fixed monthly charges
- TOU peak/off-peak export rates and % production during peak hours
- Rate escalation, panel degradation, and excess credit policy
- Projection period: 10, 15, 20, or 25 years
Calculator Outputs
Annual savings broken down by component, monthly chart, true-up balance, and multi-decade projection.
- Annual savings split: self-consumption value + export credit value
- Monthly bill before and after solar with bar chart overlay
- Annual bill reduction percentage and solar offset percentage
- True-up balance (credit surplus or amount owed at year end)
- Cumulative net metering value over selected projection period
Why Solar Professionals Use This Tool
Explaining net metering savings to homeowners is one of the hardest parts of a solar sales conversation. This tool makes it concrete - showing exactly how much of the bill disappears, where the remaining balance comes from, and what happens over 25 years.
State Auto-Population
Select a state and the calculator fills in typical retail rates, export credit rates, peak sun hours, and the applicable NEM policy type - full retail, net billing, or no net metering.
Three NEM Policy Models
Supports traditional 1:1 retail credit NEM, net billing / NEM 3.0 avoided-cost rates, and states with no net metering - each with distinct true-up logic and excess credit handling.
Self-Consumption Optimizer
Compares four scenarios side by side - baseline, load shifting, battery addition, and combined - to show customers which behavior changes or equipment additions deliver the best return.
How It Works
The calculator processes monthly production and usage distributions against your annual figures, then applies your rate inputs to compute self-consumed solar value and export credit value month by month.
Select Your State
The state dropdown auto-fills retail rate, export credit rate, peak sun hours, and the correct NEM policy type. Dynamic warnings appear for California NEM 3.0, no-NEM states, and regions with variable policies.
Enter System and Usage Data
Input system size in kW - annual production auto-estimates from peak sun hours. Enter the customer's annual home usage in kWh. Adjust the self-consumption slider to match a typical household profile for the customer's load schedule.
Configure Rate and Policy Settings
Override auto-populated rates with the customer's actual bill data. Enable TOU mode to enter peak/off-peak export rates and the share of production during peak hours. Set the excess credit policy to match how the utility handles annual credit rollover.
Set Projection Parameters
Choose rate escalation and panel degradation rates. Select a projection period (10–25 years). The advanced settings section lets you model the impact of rate changes on long-term savings.
Review Annual and Long-Term Results
Results update in real time. The monthly bar chart shows production vs. usage with savings overlay. The true-up panel shows year-end balance and the 25-year cumulative savings figure for use in proposals.
Built for Every Solar Professional
Customer Education
Show homeowners exactly how net metering turns solar production into bill reduction. The monthly chart makes the concept tangible - summer overproduction credits offset winter shortfalls in a way text alone can't convey.
Multi-State Proposals
Installers operating across state lines use the state auto-fill to quickly generate state-specific savings estimates. NEM policy warnings flag states where export credits are limited or unavailable before a full proposal is built.
System Size Optimization
Adjust system size and usage inputs to find the point where additional capacity produces diminishing export credit returns. Under net billing policies, right-sizing to maximize self-consumption consistently outperforms oversizing.
Calculation Methodology
The calculator separates annual savings into self-consumption value (solar kWh used on-site) and export credit value (solar kWh sent to the grid), then projects both components forward with rate escalation and panel degradation applied year by year.
Self-Consumption Value
SC Value = (Annual Production × SC%) × Retail Rate kWh consumed directly from solar avoids grid purchases at full retail rate. This component is unaffected by net metering policy - its value only depends on the retail rate.
Export Credit Value
Export Value = Exported kWh × Export Credit Rate Under full retail NEM, the export rate equals the retail rate. Under net billing, it is the avoided-cost rate. Under no-NEM policies, exported kWh may earn a flat buyback rate or nothing at all.
TOU Export Weighting
Blended Rate = (Peak% × Peak Rate) + ((1−Peak%) × Off-Peak Rate) When TOU mode is enabled, exported kWh are split between peak and off-peak periods using the production-during-peak percentage. The blended export rate replaces the flat export rate in all calculations.
Long-Term Projection
Year N = Year 1 Savings × (1−Deg)^N × (1+Esc)^N Each year, production declines by the degradation rate while savings grow with the electricity rate escalation. The excess credit policy (forfeited, avoided cost, or full retail rollover) determines how year-end surplus is treated.
Pro Tips for Net Metering Analysis
Pull the Annual kWh From the Utility Bill
Most utility bills show a 12-month usage summary. Using the actual annual kWh rather than an estimate eliminates the biggest source of savings calculation error and makes the output much more defensible in a sales conversation.
Enable TOU for California, Texas, and New York
Utilities in these states have moved most solar customers to TOU rates. Daytime solar production often falls in lower-value off-peak periods, so the flat-rate assumption overstates export credit value. The TOU inputs correct for this.
Set Excess Credit Policy to "Forfeited" as Default
Many utilities do not roll over annual credit surpluses. Starting with "forfeited" gives the most conservative estimate. If the customer's utility does carry credits forward, switching to the correct policy shows the additional value - making it a positive surprise rather than an overpromise.
Use the Self-Consumption Optimizer Before Recommending Battery
Before adding storage cost to a proposal, run the optimizer to see how much value load-shifting alone (running dishwasher, EV charger, and laundry during solar production hours) recovers. For many customers, behavioral changes recover 60–70% of the battery benefit at no cost.
Frequently Asked Questions
How does net metering work?
Net metering lets solar system owners send excess electricity to the grid in exchange for credits on their utility bill. When your panels produce more than you use - typically on sunny summer days - the surplus flows to the grid and your meter runs backward (or a credit accumulates). At night or on cloudy days, you draw from the grid and use those credits to offset the cost. At the end of the billing period (monthly or annually depending on your utility), the net difference determines your actual bill.
Which states have the best net metering policies?
States with strong full retail credit NEM policies include New Jersey, Massachusetts, New York, and Illinois. These states credit exported solar at or near the full retail rate with favorable rollover provisions. States like Hawaii, Arizona, and California have shifted to avoided-cost or net billing frameworks that pay significantly less for exports. Several states - including Tennessee, Alabama, and parts of the Southeast - have limited or no statewide net metering mandates, leaving it to individual utilities to decide.
What is the difference between net metering and net billing?
Traditional net metering credits exported solar at the full retail electricity rate - so one kWh exported offsets one kWh imported on your bill. Net billing (used in California's NEM 3.0 and some other states) credits exports at a much lower "avoided cost" rate, typically 20–30% of the retail rate, because the utility only pays what it would cost to generate or procure that energy elsewhere. Under net billing, self-consumed solar becomes far more valuable relative to exported solar, which is why battery storage pairs well with NEM 3.0.
What happens to excess credits at the end of the year?
It depends on your utility and state policy. Some utilities roll annual credit surpluses forward indefinitely at full value. Others cash out excess credits at the end of the true-up period at avoided-cost rates (typically $0.03–$0.06/kWh), which is much less than the retail rate. Some utilities simply zero out the balance - any unused credits are forfeited. The calculator lets you set the excess credit policy to match your customer's utility so the savings estimate reflects what they will actually receive.
How much can I save with net metering?
A typical 8 kW residential system in a full retail NEM state can generate $1,200–$2,000 in annual savings depending on local electricity rates and the household's usage pattern. In states with high rates like California, Connecticut, or Massachusetts, savings can exceed $2,500/year. In states with lower rates or weaker NEM policies, savings may be $800–$1,200/year for the same system size. The calculator computes your specific number based on your actual inputs rather than national averages.
Does net metering apply to commercial solar installations?
Yes, most state NEM programs cover commercial customers, though system size caps and credit structures often differ from residential rules. Commercial customers on demand-charge rate schedules have more complex savings calculations - net metering credits reduce energy charges but may not affect demand charges at all. This calculator is optimized for residential NEM analysis. Commercial projects with demand charges benefit from a dedicated commercial energy savings tool or a full load profile analysis.
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