US residential solar · 2026 data

Solar Panels for a $350/Month Electric Bill

Q: How much does solar cost for a $350/month bill in 2026?

An 18.5 kW system costs about $52,000–$62,000 before incentives at $2.80–$3.36 per installed watt. The $3.36 figure is the national benchmark reported by SEIA and Wood Mackenzie; actual quotes vary by state, equipment, and roof. Larger systems often have a lower price per watt, so compare quotes by $/W, not total price.

Q: Is there still a federal tax credit for solar in 2026?

Not for homeowners who buy with cash or a loan. The 30% Residential Clean Energy Credit (Section 25D) does not apply to expenditures made after December 31, 2025, under the One Big Beautiful Bill Act. Some state programs still exist, such as New York's 25% credit (up to $5,000) and Massachusetts' 15% credit (up to $1,000) plus its SMART incentive. Leases and PPAs may still pass through federal value claimed by the provider under commercial-credit rules, so compare terms carefully and confirm current deadlines. This is not tax advice.

Q: Is solar worth it if I pay $350 a month for electricity?

It depends mostly on your electricity rate and net metering rules. Because a $350 bill is large, savings are large too, but so is the system. In our model, simple payback is about 12–15 years at the U.S. average rate (17.3¢/kWh), 7–10 years at 25–30¢/kWh, and 14–21 years at 12–15¢/kWh. Over 25 years, a cash-purchased system at the average rate nets roughly $72,000–$83,000 with no incentives, assuming 2.5% annual rate growth and 100% bill offset.

Q: Will 47 solar panels fit on my roof?

A 47-panel array needs roughly 900–1,050 square feet of usable roof, assuming 400 W panels of about 20–22 sq ft each. Usable area is often smaller than total roof area because of vents, chimneys, shading, and fire-code setbacks. If your best roof plane fits fewer panels, you can split the array across planes, add a ground mount, or size a smaller system that offsets part of your bill.

Est. net savings

$72,000

Over 25 years (modeled, no incentives) · no federal credit

$51,700+ Est. cost (no federal credit)

12–15 yrs Payback

18.5 kW System size

Typical result:

35–60 panels (47 at 4.5 sun hours)
14–24 kW (18.5 kW typical)
$52K–$62K before state incentives
12–15 year payback at 17.3¢/kWh

✓ EIA rates & NREL sun data ✓ 2026 federal policy applied ✓ Open methodology

Updated October 3, 2026 · 9 min read ·By Green Energy Calculators Editorial Team

Calculate My Savings View State Incentives

25 years without solar vs with solar

Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate

Without solar

25-year utility bills

$134,000

Rates rise ~3% per year

With solar

System cost + remaining bills

$51,700

Installed cost, no federal credit

Difference

Estimated 25-year net

+$82,300

Before any state or utility incentives

Author Green Energy Calculators Editorial Team

Editorial policy No paid placements

Last updated Oct 3, 2026

Data approach EIA rates · NREL sun hours · 2026 federal policy · methodology

A $350 monthly electric bill needs roughly 35–60 solar panels (14–24 kW), depending on how much sun your roof gets. At the 2025 U.S. average residential rate of about 17.3¢/kWh and 4.5 peak sun hours, that works out to about 47 panels rated at 400 W (18.5 kW). Installed cost in 2026 is roughly $52,000–$62,000, and the 30% federal homeowner tax credit ended on December 31, 2025, so state incentives and your local rate now drive the payback. This guide shows the math step by step, with charts built from the formulas shown, not from customer anecdotes.

At a glance ($350/month bill)	Typical value
Monthly / annual usage (at 17.3¢/kWh)	~2,023 kWh / ~24,300 kWh
System size (4.5 sun hours)	~18.5 kW
Panels (400 W each)	~47 (range 35–60)
Installed cost ($2.80–$3.36/W)	~$52,000–$62,000
Federal homeowner tax credit	None after Dec 31, 2025
Simple payback at U.S. average rate	~12–15 years

Last updated October 3, 2026. Figures are modeled estimates, not quotes.

How to Size a Solar System for a $350 Monthly Electric Bill

Start with usage. Dividing $350 by the 2025 U.S. average residential rate of about 17.3¢/kWh (EIA) gives roughly 2,023 kWh a month, or about 24,300 kWh a year. Your own rate may differ a lot; check the “price per kWh” on your latest bill. If part of your bill is fixed monthly charges, your true kWh usage is lower than this estimate, because fixed charges buy no electricity.

Convert annual usage into system size with a standard rule of thumb:

System size (kW DC) = Annual kWh ÷ (peak sun hours per day × 365 × 0.80)

The 0.80 factor covers real-world losses such as inverter efficiency, wiring, heat, and dirt on the panels. Installers use detailed tools such as NREL’s PVWatts calculator for your exact ZIP code, tilt, and shading, so treat this formula as a first estimate.

System size needed for a $350/month bill by peak sun hours. An 18.5 kW system covers the 4.5-hour case. Calculated from 24,277 kWh/year (EIA 17.3¢/kWh average) with a 0.80 loss factor; sun hours are scenarios, not state averages.

Chart summary: The same $350 bill needs a 23.8 kW system (about 60 panels) in a low-sun location but only 13.9 kW (about 35 panels) where there are 6 peak sun hours. Every extra half hour of sun trims the required system by roughly 1.5–3 kW. As a rough guide, the Pacific Northwest sits near the low end, much of the Midwest and Northeast near the middle, and the Southwest near the high end; confirm yours in PVWatts.

At 400 W per panel, 18.5 kW is about 47 panels. Each panel takes roughly 20–22 sq ft, so plan on 900–1,050 sq ft of usable roof. If your roof fits fewer panels, you will offset a smaller share of the bill; a split south/west array or a ground mount can help.

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What Does a Solar System This Size Cost in 2026?

Residential solar is commonly quoted between about $2.50 and $3.50 per watt before incentives in 2026. We model $2.80–$3.36/W, where $3.36/W is the national benchmark reported by SEIA and Wood Mackenzie. Your quotes will vary by state, equipment, and installer.

System size	Est. gross cost ($2.80–$3.36/W)
12 kW (partial offset)	$33,600–$40,320
15 kW	$42,000–$50,400
18.5 kW (typical for $350 bill)	$51,800–$62,160
20 kW	$56,000–$67,200
24 kW (low-sun regions)	$67,200–$80,640

The federal homeowner credit is gone. The IRS states that the Section 25D Residential Clean Energy Credit is not allowed for expenditures made after December 31, 2025. A system must have been installed and operating by that date to claim it. Many older articles, and many installer ads, still quote a 30% credit; for a system placed in service in 2026 or later, ignore them.

What can still lower your cost:

State credits and programs. New York offers a 25% state income tax credit up to $5,000, and it can apply to long-term leases and PPAs. Massachusetts offers a 15% credit up to $1,000, plus the SMART production incentive. Other states vary; check DSIRE or our state incentives hub.
Lease or PPA. Third-party-owned systems may still benefit from federal commercial-credit rules claimed by the provider. Deadlines are tight and terms vary, so compare total lifetime cost, not just the monthly payment.
Quote comparison. The most useful number on a quote is $/W installed. Also confirm inverter warranty length, whether permit and interconnection fees are included, and any financing “dealer fee” built into a loan-financed price. For more, see our guide to how much solar panels cost in 2026. For more on this topic, see our guide to How Many Solar Panels for a $500 Electric Bill?.

Worked Example: Sizing a System for a $350 Bill

This is an illustrative calculation, not a report on a specific customer.

Usage: $350 ÷ $0.173 per kWh ≈ 2,023 kWh per month ≈ 24,277 kWh per year.
Production per kW: 4.5 sun hours × 365 × 0.80 ≈ 1,314 kWh per kW per year.
System size: 24,277 ÷ 1,314 ≈ 18.5 kW.
Panels: 18,500 W ÷ 400 W ≈ 47 panels.
Gross cost: 18,500 W × $2.80–$3.36 ≈ $51,800–$62,200.
Year-1 savings (if the system offsets 100% of the bill): ≈ $4,200, assuming the bill is entirely usage-based and your utility credits exported power at or near retail.

Two things can break this example. First, if your utility pays less than retail for exported power (as in California under NEM 3.0, where export credits are well below retail rates), your savings will be lower unless you use most of the power as it is produced or add a battery. Second, most of Texas has no statewide net metering rule, so credit for exported power depends on your retail electricity plan; check before sizing.

Solar Payback Period for a $350/Month Bill — By Electricity Rate

For a fixed $350 bill, the electricity rate has two opposite effects. A high rate means fewer kWh behind the same bill, so you need a smaller, cheaper system, while savings stay near $4,200 a year. A low rate means more kWh, so a larger, costlier system saves the same dollars. That is why payback is much shorter in high-rate areas.

Rate (¢/kWh)	System size (4.5 sun hrs)	Panels (400 W)	Est. gross cost	Simple payback*
12	26.6 kW	~67	$74,600–$89,500	17.8–21.3 yrs
15	21.3 kW	~54	$59,700–$71,600	14.2–17.0 yrs
17.3 (U.S. avg.)	18.5 kW	~47	$51,700–$62,100	12.3–14.8 yrs
20	16.0 kW	~40	$44,700–$53,700	10.7–12.8 yrs
25	12.8 kW	~32	$35,800–$43,000	8.5–10.2 yrs
30	10.7 kW	~27	$29,800–$35,800	7.1–8.5 yrs

Gross cost ÷ $4,200 annual savings, with no incentives, no rate growth, and 100% bill offset. Both ends of the range use the $2.80 and $3.36 per watt assumptions.

Simple payback for a $350/month bill by electricity rate. At the 17.3¢/kWh U.S. average, payback is 12.3–14.8 years. Gross cost ÷ $4,200 annual savings, 4.5 sun hours, no incentives; cost cases use $2.80/W and $3.36/W (SEIA/Wood Mackenzie benchmark), rates per EIA.

Chart summary: At the U.S. average rate of 17.3¢/kWh, simple payback lands at about 12–15 years. At 25–30¢/kWh it drops to roughly 7–10 years, while at 12–15¢/kWh it stretches to about 14–21 years. State credits, rebates, rising utility rates, and lower quotes shorten these numbers; fixed utility charges, low export credits, and shading lengthen them.

Solar vs utility company · 25-year comparison

25-year totals: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology

Total utility payments

$134,000

Total solar cost (installed + remaining bills)

$51,700

Net savings

+$82,300

Avg. monthly difference

+$275/mo

See my savings →

25-Year Savings Projection for a $350/Month Solar System

The projection below models an 18.5 kW system that offsets 100% of a $350 bill at the national average rate. Assumptions: 2.5% annual electricity price growth, 0.5% annual panel degradation, a cash purchase, no incentives, and no inverter replacement. Two cost cases are shown: $2.80/W ($51,733) and $3.36/W ($62,079).

Modeled 25-year cumulative cash flow for an 18.5 kW system. Break-even falls in year 12 to 14, with a net gain of $72,233 to $82,580 by year 25. Assumes 2.5% annual rate growth from the 17.3¢/kWh EIA average, 0.5% degradation, cash purchase, and no federal credit or state incentives.

Chart summary: Under these assumptions the system breaks even in about year 12 (lower-cost case) or year 14 (higher-cost case) and finishes year 25 with a net gain of roughly $82,600 or $72,200. Treat this as a model: results move with your rate, incentives, shading, and export credits, and inverters often need replacing once during a 25-year life, which would reduce the totals.

Financing changes the picture. A solar loan lowers upfront cost but adds interest, and a lease or PPA usually returns less lifetime value to you because the provider keeps part of the savings. Ownership generally favors homeowners who will stay 10 years or more.

Is Solar Worth It at $350 a Month?

For many households, yes, but not in every market. Solar tends to work best when:

your rate is above roughly 20¢/kWh, which shortens payback to about 11–13 years or less;
your utility offers full-retail net metering or you can use most of your power on site;
you qualify for state or utility incentives now that the federal credit is gone;
you plan to stay in the home 10+ years.

Solar can also raise resale value. A 2015 Lawrence Berkeley National Laboratory study of home sales found a premium of about $4 per watt on average. That research is dated and results vary by market, so treat it as directional rather than a promise.

Before signing, run your actual rate and ZIP code through our solar savings calculator and solar payback calculator, then compare at least three quotes by $/W.

Sources and Methodology

Electricity rate: U.S. average residential price of about 17.3¢/kWh for 2025, from U.S. Energy Information Administration data (EIA State Electricity Profiles). Your own rate will differ.
Federal tax credit status: IRS FAQs on Public Law 119-21 (One Big Beautiful Bill): Section 25D is not allowed for expenditures made after December 31, 2025.
Installed cost: $3.36/W national benchmark as reported by SEIA/Wood Mackenzie (via solar.com); $2.80/W is the low end of commonly published 2026 ranges of roughly $2.50–$3.50/W.
State incentives: New York 25% credit (cap $5,000) and Massachusetts 15% credit (cap $1,000) plus SMART; verify current rules at DSIRE.
System sizing: The formula above is a rule of thumb. Use NREL PVWatts for location-specific production.
Home value: Lawrence Berkeley National Laboratory, “Selling Into the Sun” (2015).
Model assumptions: 400 W panels, 0.80 loss factor, 4.5 peak sun hours, 2.5% annual rate growth, 0.5% annual degradation, no incentives, no financing costs, no inverter replacement. All charts and tables on this page are calculated from these assumptions.

This guide is for general information and is not tax, legal, or financial advice. Consult a licensed installer and a tax professional before buying.

Frequently asked questions

Direct answers for US homeowners — sized for a $350/month electric bill.

How many solar panels do I need for a $350 electric bill?

Most homes need 35–60 panels (14–24 kW), depending on sunlight. At the 2025 U.S. average residential rate of about 17.3¢/kWh, $350 a month is roughly 2,023 kWh a month, or 24,300 kWh a year. With 4.5 peak sun hours and a 0.80 system-loss factor, that requires about an 18.5 kW system, or 47 panels rated at 400 W. Sunnier regions (about 6 sun hours) need roughly 35 panels; cloudier regions (about 3.5 sun hours) need about 60. Your rate matters too: a higher rate means fewer kWh for the same $350.

How much does solar cost for a $350/month bill in 2026?

Is there still a federal tax credit for solar in 2026?

Is solar worth it if I pay $350 a month for electricity?

Will 47 solar panels fit on my roof?

Popular state solar guides

Electricity rates and incentives vary — see data for your state.

CA California 33.25¢/kWh · 5.8h sun TX Texas 16.06¢/kWh · 5.6h sun FL Florida 15.3¢/kWh · 5.7h sun AZ Arizona 15.44¢/kWh · 6.5h sun NC North Carolina 14.94¢/kWh · 5.2h sun NY New York 29.38¢/kWh · 4.3h sun MA Massachusetts 30.14¢/kWh · 4.2h sun CO Colorado 16.72¢/kWh · 5.5h sun

View all 50 states →

How these numbers were calculated

Electricity rate: 18.19¢/kWh — US average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production: 4.5 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price: $3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit: $0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering: National blend — solar assumed to offset 75% of the bill (87% in full-retail net-metering states, 55–70% elsewhere).
Model: Version 2026.10 · 3%/yr electricity price escalation · 0.5%/yr panel degradation · simple payback = installed cost ÷ year-1 savings
Policy checked: September 29, 2026 · Full methodology · Report an error

Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.