How Much Can Solar Save You — and Is It Worth It?

The honest answer to "how much can solar save you" sits between $20,000 and $150,000 over 25 years, but that range only narrows when you plug in your own numbers. Three inputs decide it: your annual kWh usage, your system's annual kWh production, and your utility rate per kWh. Sunshine matters less than people expect; your electricity rate matters more. Below is the math, the city-by-city evidence, and an honest read on when solar pays off and when it does not.

Why offset percentages hide your real savings

Most solar quotes lead with a line like "this system covers 87% of your electricity." That figure is almost always accurate. It is also almost useless for deciding whether to buy.

Offset is a ratio of solar production to home usage. It says nothing about the price of electricity. An 87% offset on a $60 monthly bill is a different story from 87% offset on a $300 monthly bill. The percentage looks identical; the dollar savings are not.

Solrova reports savings in kWh because that is what your utility meter measures. Your bill comes from two numbers — the kWh you bought and the rate you paid per kWh. When solar reduces the kWh you buy, multiply the avoided kWh by your rate and you have your real dollar savings.

The kWh figure is also auditable. Your inverter logs production every minute. If a proposal promises 14,200 kWh per year and your system delivers 14,200 kWh per year, the estimate held. An offset percentage drifts whenever your usage drifts — buy an electric car and your offset falls even though the system performed perfectly.

The four-step math you can run yourself

You can estimate your own savings using the numbers on your utility bill. Start with annual usage: add up the last 12 months of kWh from your bill or online account. The U.S. average runs about 10,500 kWh per year, while homes with EVs or electric heating often hit 15,000 to 25,000.

Next, estimate annual production. The standard formula is system size in kW multiplied by peak sun hours per day multiplied by 365 multiplied by 0.80. The 0.80 factor accounts for heat, wiring loss, and inverter inefficiency. If an installer promises a higher number, ask to see the production model.

Third, multiply annual kWh produced by your current rate per kWh. The rate appears on your bill as "energy charge" or "rate per kWh." That product is your Year 1 dollar savings.

Fourth, project lifetime savings using an annual rate escalation. Solrova assumes 3.5% per year, which matches the U.S. historical average. Over 25 years of compounding, Year 1 savings multiplied by roughly 38.95 gives a reasonable lifetime gross. Subtract 0.5% annual panel degradation and a one-time inverter replacement near year 13.

A 10.5 kW system in Phoenix at 5.8 peak sun hours and a $0.12/kWh rate produces about 17,800 kWh per year, saves $2,136 in Year 1, and totals roughly $83,000 over 25 years before subtracting the $25,200 system cost.

Rate, not sunshine, sets your real savings

The eight-city table below uses a standard 10 kW system and shows why two homes with identical equipment can land thousands of dollars apart.

Los Angeles and Boston, neither famous for desert sunshine, post the highest 25-year savings on the list. A Los Angeles home saves $143,900 while a Phoenix home saves $77,400 on the same system. Sun hours barely differ (5.6 vs. 5.8). The gap is the $0.23/kWh Los Angeles rate against $0.12/kWh in Phoenix.

Boston makes the point more sharply. At 4.4 peak sun hours, well below the national average, a Boston system still produces $123,000 in lifetime savings because Massachusetts electricity costs $0.25/kWh. Seattle reverses the pattern: respectable sun but $0.11/kWh hydropower-fed rates leave lifetime savings at $46,600.

Sun hours determine how much electricity your roof can make. Your rate determines what each kWh is worth. High-rate states with average sunshine almost always pay back faster than low-rate states with abundant sun.

When solar makes sense and when to walk away

Solar is a strong financial decision when four conditions stack up. Your monthly bill clears $150. Your roof has 4.5 or more peak sun hours and minimal shading. You expect to stay in the home seven years or longer. And your roof faces south or west with enough surface area for the size you need.

Several common scenarios make solar a poor fit. A bill under $80 leaves too little spend to recover system cost. A roof due for replacement within five years means $3,000 to $6,000 to remove and reinstall panels — replace the roof first. A move within three to five years compresses payback into a window where the 3 to 4 percent home-value uplift is too speculative to bank on. Heavy shading can cut output by 20 to 40 percent and break the math.

How 2026 tax credit changes shifted the math

The federal residential tax credit under Section 25D expired on December 31, 2025. Cash and loan buyers in 2026 receive no federal credit. That removed $6,000 to $12,000 of upfront cost reduction for most home-sized systems and added roughly two to three years to typical payback periods.

Leases and power purchase agreements look different. The commercial Section 48E credit, worth 30 percent, remains available under current law if the project starts construction by July 4, 2026, or is in service by December 31, 2027. The solar company that owns the system captures it on the asset and typically passes part of the benefit through as a lower monthly rate. Leasing has become more competitive with ownership in many markets in 2026, which inverts the historical pattern.

The right choice depends on your tax position, cash on hand, and time horizon. No financing structure is universally best. A full comparison sits in our Cash vs. Loan vs. Lease vs. PPA guide. The savings math itself — kWh produced multiplied by your rate — does not change. Only the upfront cost and payback period shift with the financing path.