Vermont Solar Calculator

VT's $0.21/kWh rates + 6% sales tax exemption + net metering (up to 500 kW) + GMP battery programs make Vermont solar financially compelling — enter your Green Mountain Power or VEC bill to see your savings.

Your Vermont solar inputs

Monthly electric bill?

Utility?

System size?

Battery backup?

Vermont solar estimate

20 × 400W panels (8 kW system)

Monthly usage800 kWh/mo

Annual production (VT 4.0 PSH)9,344 kWh/yr

Annual savings (net metering)$1,962/yr

Gross system cost$24,800

Federal ITC (30%)-$7,440

Sales tax exemption (6%)-$1,488

Net cost after incentives$15,872

Payback period8.1 yrs

25-year savings$49,056

VT incentives: 30% federal ITC + 6% sales tax exemption + net metering (up to 500 kW) + GMP battery programs. No VT state income tax credit for solar. VSECU and other VT credit unions offer solar-specific loans. REC market provides additional revenue for VT solar owners. GMP battery program details vary — confirm with Green Mountain Power.

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How to Use This Calculator

Vermont solar: high rates, strong policy, unique GMP battery programs

Vermont has electricity rates around $0.21/kWh — high by national standards — and some of the most ambitious renewable energy goals in the country (100% renewable by 2030). Green Mountain Power, which serves most of VT, has pioneered innovative battery leasing programs and solar incentives. VT offers sales tax exemption on solar equipment (6%), retail net metering for systems up to 500 kW, and access to the REC (Renewable Energy Certificate) market. Vermont's small size and progressive energy policy make it a consistently solar-friendly environment.

Enter your bill and select your VT utility

Green Mountain Power serves most of Vermont including Montpelier, Rutland, and most rural areas. Vermont Electric Co-op serves northeastern VT at similar rates. Burlington Electric serves Burlington city at a slightly lower $0.18/kWh rate. GMP customers have access to unique battery programs not available to other VT utility customers. Enter your monthly bill, select your utility, and set your system size to see your estimated savings.

GMP battery programs and VSECU solar loans

Green Mountain Power's battery programs include leased Tesla Powerwalls at reduced rates for enrolled customers, and demand response programs that pay battery owners for grid services. VSECU (Vermont State Employees Credit Union) and other VT credit unions offer solar-specific loans at favorable rates — typically 5-6% for qualified borrowers. Vermont's REC market allows solar owners to sell renewable energy certificates, adding modest additional revenue ($10-30/MWh) on top of net metering savings.

The Formula

Monthly kWh = Monthly Bill ÷ Electricity Rate Annual Production = System kW × 1000 × 4.0 PSH × 365 × 0.80 efficiency ÷ 1000 Self-consumed kWh = Annual Production × 0.65 Exported kWh = Annual Production − Self-consumed kWh Annual Savings = (Self-consumed + Exported) × Retail Rate (VT net metering) Gross Cost = System kW × 1000 × $3.10/W + Battery ($12,000 if added) ITC Credit = Gross Cost × 30% Sales Tax Saving = Solar Hardware Cost × 6% (VT sales tax, solar exempt) GMP Battery Incentive = ~$2,500 est. (GMP customers with battery only) Net Cost = Gross Cost − ITC − Sales Tax − GMP Battery Incentive Payback = Net Cost ÷ Annual Savings

Vermont averages 4.0 peak sun hours — lower than the US average but not dramatically so. Burlington (4.1 PSH) gets slightly more than Montpelier (3.9 PSH) due to lake effect on cloud patterns. VT's $3.10/W installation cost reflects a mature installer market with multiple competitors in the Burlington metro. The 6% sales tax exemption saves approximately $1,488 on a typical 8 kW system — meaningful upfront savings applied at time of purchase.

Example

Sarah — Montpelier Green Mountain Power customer

Sarah is in Montpelier on GMP paying $126/month at $0.21/kWh. She wants a 6 kW system.

Monthly bill$126 (Green Mountain Power, $0.21/kWh)

System6 kW, no battery

LocationMontpelier, VT (3.9 PSH)

Result

Annual production~6,847 kWh/yr

Annual savings (net metering @ $0.21)~$1,438/yr

Gross system cost~$18,600

Federal ITC (30%)-$5,580

Sales tax exemption (6%)-$1,116

Net cost after incentives~$11,904

Payback period~8.3 years

25-year savings~$35,950

VT's $0.21/kWh rate drives a relatively fast 8-year payback despite the lower 4.0 PSH resource. Sarah's 6 kW system covers approximately 67% of her annual electricity usage, and net metering credits her retail rate for exports. Over 25 years she saves $35,950. If Sarah adds REC sales (~$20/MWh), she earns an additional $137/year — modest but positive. GMP's net zero goals mean Sarah's solar also contributes to Vermont's aggressive clean energy targets, and future policy changes are likely to remain solar-friendly.

FAQ

Does Vermont have a state solar tax credit? ▼

No. Vermont does not currently have a state income tax credit specifically for residential solar installations. The 30% federal ITC is the primary tax incentive for VT homeowners. Vermont does offer a sales tax exemption on solar equipment (6% state sales tax), which provides meaningful upfront savings. Some VT municipalities may have local incentive programs — check with your installer. Vermont's net metering law and GMP battery programs are the main state-level supports for residential solar.

How does Vermont's sales tax exemption for solar work? ▼

Vermont exempts solar energy equipment from the state's 6% sales tax under Vermont law. This applies to solar panels, inverters, mounting hardware, wiring, and battery storage systems. Your solar installer applies for the exemption and should not charge VT sales tax on the equipment portion of your installation. On a $24,800 system (8 kW at $3.10/W), this saves approximately $1,488 at time of purchase. The sales tax exemption is applied immediately — unlike the federal ITC which is claimed at tax time the following year.

How does Vermont net metering work? ▼

Vermont's net metering (Group Net Metering Act, 30 V.S.A. § 219a) allows residential customers to receive retail-rate credit for solar production that exceeds consumption. Systems up to 500 kW are eligible. Green Mountain Power, Vermont Electric Co-op, and Burlington Electric all offer retail net metering. Credits accumulate monthly and can be applied to your bill. Unused annual credits are paid out at a wholesale rate at year-end. Vermont's net metering has been stable and strongly supported by state policy — the Public Utility Commission has consistently upheld retail-rate net metering for residential customers.

What are GMP's battery programs and are they worth it? ▼

Green Mountain Power offers a unique Tesla Powerwall lease program where GMP customers can lease a Powerwall for approximately $55/month, significantly lower than purchasing outright. GMP retains the ability to use the batteries for grid services (demand response) but provides backup power to enrolled customers. GMP also runs demand response programs that pay battery owners for grid services. The value of GMP battery programs depends on your specific situation — the lease model reduces upfront cost but doesn't qualify for the ITC. Purchasing a battery outright qualifies for the full 30% ITC plus any GMP demand response payments. Consult with a GMP-certified installer to compare lease vs. purchase for your situation.

Can Vermont solar owners sell RECs? ▼

Yes. Vermont solar owners can participate in the New England renewable energy certificate (REC) market. RECs represent the environmental attributes of renewable generation — one REC equals one megawatt-hour of solar production. VT RECs typically trade at $10-30/MWh in the New England market. On an 8 kW VT system producing ~9,142 kWh/year, this adds approximately $91-274/year in REC revenue. RECs must be tracked and sold through a certified aggregator — your installer may offer REC aggregation services. Note: if you claim your solar as "renewable" for personal or marketing purposes, you should retain your RECs rather than selling them.

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