Solar Savings Calculator

⚡Rocky Mountain Power

Usage Inputs — enter one

RMP Rate Rocky Mountain Power 2026

Rate per kWh Rocky Mtn Power default · adjust for your area

Annual Rate Inflation how fast rates increase each year

Avg Monthly Bill dollars · OR enter kWh below

Yearly kWh Usage OR enter monthly bill above

Current Costs

Monthly Bill (Today)—

Yearly Cost (Today)—

Rate per kWh$0.156

Projected Spend with RMP

Year	Avg Monthly	Total Paid

Total Spent in 30 Years with RMP

$—

Enter your monthly bill to see projection

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System Inputs

System Size (kW) auto-corrects to 440W panels

Price Per Watt gross · customer pays 75% (70% with battery)

Home Value for equity-adjusted breakeven

Customer Net Price (75%) —

Panel Count —

Rocky Mountain Power Rebates

WattSmart Rebate RMP program · −$2,000 off net price

OFF

10kW+ Bonus Rebate systems ≥10kW · −$2,000 off net price

OFF

Battery (Optional)

Add Battery?

Loan · 20yr @ 8.5% · 6-Mo Deferral

Total Loan Amount—

Monthly Payment (Mo 7–240)—

Total Paid End of Loan (w/ interest)—

Early Payoff — Total Savings vs RMP

PAY OFF YEAR 5

—

balance —

PAY OFF YEAR 10

—

balance —

PAY OFF YEAR 15

—

balance —

30-Year Savings vs Rocky Mountain Power

$—

Enter both columns to see savings

Breakeven Analysis — Utility Savings + Home Equity

⚡ Utility Breakeven Only

—

Comparing cumulative RMP spend vs total solar cost

🏠 With Home Equity

—

Solar cost minus instant home value increase

🏡 Home Equity Boost from Solar

4.1%

3% (conservative)6.8% (SolarReviews '24)10% (top markets)

📚 Research Behind These Numbers

DOE / Berkeley Lab Selling Into the Sun (2015) — analyzed 22,822 home sales across 8 states. Buyers paid an average of $4/W premium (~$15,000 for a typical system). Funded by U.S. Dept. of Energy SunShot Initiative.

Zillow 2019 National Study — homes with solar sold for 4.1% more on average nationwide. For the median home that's +$9,274. No U.S. metro saw home values drop due to solar.

SolarReviews '24 Replication of the Zillow methodology on 2020–2023 data found homes with solar now sell for 6.8% more on average, translating to ~$25,381 in added value at today's median home price.

NREL / DOE Lab National Renewable Energy Laboratory found every $1 saved annually on energy bills adds $20 to home value. A system saving $1,800/yr could add $36,000 in property value.

NAR 2024 National Association of REALTORS Sustainability Report: 44% of homebuyers said utility costs were an important factor in the buying process. Important: only applies to owned systems, not leased.

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