Residential electricity prices in 78666 in June 2026 averaged approximately 15.94 cents per kilowatthour (¢/kWh), which was about 13% less than the national average rate of 18.34 ¢/kWh (June 2026). [1]
→ Electricity rates listed as zero are not currently available.
See how electricity costs in 78666 differ from the average electricity costs for the U.S. overall. [1]
On a year-over-year basis - from May 2025 to May 2026 - residential electricity prices in 78666 increased approximately 6%, from 15.53 ¢/kWh to 16.44 ¢/kWh. [1]
→ Electricity rates listed as zero are not currently available.
Sorry, 78666 residential natural gas price data is not currently available. Please check back later.
See the chart below to see a comparison of San Marcos natural gas prices against U.S. average prices. Compare 78666 (San Marcos, TX) natural gas costs to overall U.S. average costs. [2]
On a year-over-year basis, residential natural gas prices in San Marcos (Texas) increased approximately n/a%, from $/Mcf ( ) to $/Mcf ( ). [2]
→ Natural gas prices listed as zero are not currently available.
Sorry, 78666 solar data is not currently available. Please check back later.
See the chart below for a comparison of San Marcos solar radiation levels against other areas in the U.S. Compare San Marcos levels against both 1) low average solar radition levels (WA) and also 2) high average solar radiation levels (NV). [3]
→ k/m/d: kilowatt hours per square meter per day.
→ Solar radiation values listed as zero are not currently available.
Households in the United States have benefited from falling energy prices in recent years, which has driven down the cost of living.
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Penn State researchers recently examined microgrids and discovered that they may not always be a wise economic move for communities.
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Through the analysis of publicly available data filed by electricity suppliers, the CT OCC discovered that electricity customers overpaid by $58 million in 2015.
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The ZIP code 78666 is associated with the city of San Marcos, TX in Hays County. [4]
To learn more about utility rates & usage in 78666, or for other information related to utilities in Texas, visit the U.S. Energy Information Administration.
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