Solar Panels in San Marcos, TX: Cost, Payback & Savings
A typical 8.8 kW home solar system in San Marcos costs about $35,200 and pays for itself in about 21.5 years, saving roughly $7,311 over 25 years at Texas' average electricity price of 16.1¢/kWh. Power you send back to the grid earns only about 6.0¢/kWh here, which is built into these numbers.
Monthly solar production in San Marcos
Estimated output of a 8.8 kW south-facing roof system. Jul is the strongest month (1,329 kWh); Feb the weakest (837 kWh).
Solar production (kWh) Typical home use, 1,096 kWh/month
Solar payback calculator for San Marcos
Pre-filled with San Marcos's sunshine and Texas' average electricity price. Enter your own bill and an installer's price per watt to see your payback.
Leave export credit blank where the utility offers full net metering. Where exports earn less, solar used at home as it's produced is worth the full price and the rest earns the export credit.
How San Marcos compares
- Each kW of panels here produces about 1,507 kWh a year — about the same as the Texas median and 10% more than the US median city (1,371 kWh).
- Payback ranks #150 of 258 Texas places we cover.
- Sunshine varies little across a state; electricity price, installed cost and how utilities credit exported power drive most of the difference between states.
Net metering, tax credits and incentives in 2026
Texas pays less than retail for exported solar power. Under Retail provider solar buyback plans, power you send to the grid earns about 6.0¢/kWh, against 16.1¢ for power you buy. We assume 40% of a no-battery system's output is used at home as it's produced (worth the full price) and the rest is exported, so each solar kWh is worth about 10.0¢. Using more of your solar yourself, by running appliances midday or adding a battery, raises that.
Texas has no statewide net metering. In competitive areas the export credit depends on your retail plan: most buyback plans pay about 3-9¢, a few match retail. Austin Energy pays a 9.9¢ value-of-solar rate; CPS Energy about 3-4¢. Source.
There is no federal tax credit for buying home solar installed in 2026. The 30% Residential Clean Energy Credit (Section 25D) ended for systems placed in service after December 31, 2025, so the costs and paybacks on this page include no federal credit.
Texas and local utilities may still offer rebates, performance payments, property-tax or sales-tax exemptions. Search the DSIRE incentives database for Texas and ask installers which programs they apply for you.
Frequently asked questions
Is solar worth it in San Marcos, TX?
For a typical home, a solar system pays for itself in about 21.5 years and then keeps saving money. Over 25 years the estimated net savings are $7,311. Verdict: hard to justify on savings alone. Your own payback depends on your roof, your bill and the quotes you get.
How many solar panels do I need in San Marcos, TX?
A home using 1,096 kWh a month (the Texas average) needs about 22 panels of 400 W — a 8.8 kW system — to cover its annual use. Divide your own yearly kWh by 1,507 to get the kW you need.
How much do solar panels cost in San Marcos, TX?
At 4.00 dollars per watt, a 8.8 kW system costs about $35,200 before any state or utility incentives. There is no federal tax credit for systems installed in 2026.
How much sun does San Marcos get?
San Marcos averages 5.5 peak sun hours per day, so each kilowatt of panels produces about 1,507 kWh a year.
Does Texas have net metering?
Not full retail net metering. Under Retail provider solar buyback plans, exported solar power earns about 6.0¢ per kWh, versus 16.1¢ for power bought from the grid. Solar you use at home as it's produced still saves the full price.
How much does electricity cost in Texas?
Residential electricity in Texas averages 16.1¢ per kWh, and a typical home uses 1,096 kWh a month (EIA).
Solar payback in nearby places
- Kyle21.7 yrs
- Buda21.6 yrs
- Lockhart21.7 yrs
- New Braunfels21.6 yrs
- Canyon Lake22.1 yrs
- Seguin21.5 yrs
- Cibolo21.6 yrs
- Austin21.9 yrs