Inflated 25-Year "Lifetime Savings" Numbers
Over 25 years this system will save you over $50,000. That's money straight back in your pocket.
What's actually true
Lifetime savings headlines usually add up 25 years of future dollars as if they were worth the same as today's, assume you stay the whole time, and sometimes count tax credits or inflated rate increases as savings. The real value is usually much smaller and depends on what else you could do with the money.
“$50,000 in lifetime savings” is a real-sounding number built on some generous choices. It adds 25 years of future savings as if a dollar in 2050 were worth a dollar today. It usually assumes you’ll live in the house for all 25 years. And it may count things that aren’t savings at all, like a tax credit or a home value bump. Solar can absolutely save money. The question is how much, over the time you’ll actually benefit.
Why salespeople use lifetime totals
Big numbers anchor decisions. Comparing “$47,500 in payments” to “$51,000 in savings” makes the deal look like a clear win, even when the gap is small, far in the future, or dependent on optimistic assumptions.
A worked example
Say your system saves $1,500 in year one. We’ll assume electricity rates rise 3% a year, close to the actual U.S. average of about 3.1% a year from 2005 to 2025 (EIA data), and panels lose 0.5% of output each year.
| How you count it | Savings |
|---|---|
| 25-year total, simple sum | about $51,100 |
| Same 25 years, discounted at 5% a year to today’s dollars | about $27,100 |
| First 10 years only (simple sum) | about $16,800 |
Same system, same assumptions, three very different headlines. The discounted figure answers the question that matters: what is that future stream of savings worth today, compared to what you pay? We used 5% as an illustrative discount rate; for comparison, the national average HELOC rate was about 7.34% as of October 2026 (Bankrate), and your own cost of money may be higher or lower.
Now subtract the cost. If you pay $24,000 cash, the discounted savings of about $27,100 is a modest win over 25 years. If you finance $30,000 at 3.99% for 25 years, you’ll pay about $47,500, and the “$51,000 in savings” headline nearly disappears.
Bottom line: Compare what you pay to what you save, in the same years and in today’s dollars. A lifetime total alone tells you very little.
Other ways the number gets inflated
- High rate escalation. Assuming 5% to 8% annual rate increases inflates late-year savings dramatically. See inflated rate increases.
- No degradation. Panels produce a little less each year. Skipping this adds up over 25 years.
- Full retail value for exports. Many utilities now pay much less for exported power. See net metering forever.
- Counting the tax credit as savings. Owned systems installed in 2026 get no federal homeowner credit. See claims of a 30% tax credit.
- Ignoring repairs. String inverters typically last 10 to 15 years, so a replacement may fall inside the 25-year window.
- Assuming you’ll stay. If you sell in year 8, you get eight years of savings plus whatever a buyer will pay for the system.
How it shows up in a proposal
- A large lifetime savings number on the first page.
- A cumulative savings chart that rises steeply in later years.
- Assumptions listed in tiny print, or not at all.
Questions to ask
- “What rate escalation, degradation and export rate does this assume?”
- “Can I see savings and payments year by year?”
- “What are my net savings after payments in years 1 through 10?”
- “Does this savings figure include any tax credit, rebate or home value increase?”
Check it yourself
Plug your own numbers into our payback calculator and the main calculator, check the rate assumption against our electricity rate history, and paste a sales claim into the sales claim checker. Our guides on solar payback period and is solar worth it in 2026 explain the method. Misleading savings claims can be reported to your state attorney general or reportfraud.ftc.gov.
Related red flags
"Electric Rates Go Up 6% to 8% Every Year"
From 2005 to 2025, average U.S. residential electricity prices rose about 3.1% a year, or about 0.5% a year after inflation (EIA and BLS data). Some years and some states spike higher, but a 6% to 8% yearly assumption for 25 years inflates savings a lot.
Inflated Solar Production Estimates
Production depends on your location, roof direction, tilt, shading and system losses. Estimates that ignore shading, skip degradation or use optimistic losses can overstate output, and every savings number built on it, by a wide margin.
"Your Electric Bill Will Be $0"
Most homes with solar still get a utility bill every month. Fixed customer charges, minimum bills, low export credits under net billing, and winter months with less sun mean a $0 bill is rare.
"Solar Adds 4% to Your Home's Value"
The two studies usually cited are from 2015 and 2019, and both cover owned systems. Premiums likely shrink as install prices fall. Leased systems usually add no value and can make a sale harder. Loans generally must be paid off at closing.