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San Marcos solar costs $2.00–$2.40/W in Oncor territory. Sitting on the I-35 corridor between Austin and San Antonio, San Marcos gets 5.5 peak sun hours/day and full access to Oncor incentives — up to $9,000 battery rebate and TXU retail-match buyback. No federal 25D tax credit.
2026 Alert: Federal 25D expired Dec 31, 2025. San Marcos homeowners receive $0 federal tax credits. Propel Solar uses a third-party owner to access the commercial ITC with $0 down.
San Marcos benefits from competitive pricing as both Austin and San Antonio installers serve the I-35 corridor.
The best utility solar incentive in deregulated Texas — available to San Marcos homeowners.
Oncor territory = best buyback plans in Texas.
| REP | Plan | Rate | Contract | Rollover |
|---|---|---|---|---|
| TXU EnergyTop Pick | Solar Buyback 24 | Retail-match | 24 mo | |
| TXU Energy | Solar Buyback 12 | Retail-match | 12 mo | |
| Green Mountain Energy | Solar Buyback 36 | 8.5¢/kWh fixed | 36 mo | |
| Chariot Energy | Solar Buyback 24 | 7.0¢/kWh fixed | 24 mo | |
| Constellation | Solar Buyback 12 | 6.5¢/kWh fixed | 12 mo | |
| Shell Energy | Solar Buyback 24 | 6.0¢/kWh fixed | 24 mo | |
| Rhythm Energy | Solar Buyback | Wholesale (variable) | Mo-to-mo |
Credits exported solar at your consumption rate — 1:1 net metering equivalent. Only in Oncor territory.
File Form 50-123 with Hays Central Appraisal District by April 30.
Estimate your solar costs and savings.
Estimate your solar cost, payback period, and 25-year savings for any major TX metro.
Federal Residential Solar Tax Credit (Section 25D) Expired
Homeowners who purchase solar with cash or a loan receive $0 in federal tax credits. Section 25D expired December 31, 2025.
CenterPoint delivery area. Deregulated — choose a solar buyback REP for best export value. High humidity reduces panel efficiency slightly. Strong solar irradiance despite cloud cover. Largest TX solar market by installed capacity.
Cost Range
$2.00–$2.40/W
Peak Sun Hours
5.3 hrs/day
Avg Electric Rate
$0.14/kWh
County Tax Rate
2.31%
Annual Production
15,476
kWh/year
Annual Savings
$1,800
per year
Payback Period
12.2
years
25-Year Savings
$65,627
total
Estimates based on average 2026 TX solar pricing, 5.3 peak sun hours/day, 0.5%/year panel degradation, 3%/year electricity rate increase, and TX property tax exemption (Tax Code §11.27). Actual costs vary by installer, roof condition, and system configuration. Section 25D residential ITC expired Dec 31, 2025 — $0 federal tax credit for cash/loan purchases.
$0 down solar with fixed payment and ownership by year 5.
Third-party captures 30% commercial ITC.
~10% savings from day one.
Silfab 440W panels, free maintenance.
Last updated: March 8, 2026.