Residential electricity prices in 78666 in April 2025 averaged approximately 15.55 cents per kilowatthour (¢/kWh), which was about 11% less than the national average rate of 17.45 ¢/kWh (April 2025). [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 March 2024 to March 2025 - residential electricity prices in 78666 increased approximately 2%, from 15.05 ¢/kWh to 15.30 ¢/kWh. [1]
→ Electricity rates listed as zero are not currently available.
Residential natural gas prices in 78666 in April 2025 averaged 22.56 dollars per thousand cubic feet ($/Mcf), which was approximately 41% more than the national average rate of 16.05 $/Mcf (April 2025). [2]
→ Natural gas prices listed as zero are not currently available.
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 9%, from 15.87 $/Mcf (March 2024) to 17.27 $/Mcf (March 2025). [2]
→ Natural gas prices listed as zero are not currently available.
The ZIP code of 78666 (San Marcos, TX) has an average annual solar radiation value of 5.53 kilowatt hours per square meter per day (kWh/m2/day). Compare San Marcos values to both low and high values in the U.S. overall: [3]
→ Solar radiation values listed as zero are not currently available.
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.
Five states accounted for 67% of (dry) natural gas production in the U.S. in 2013: Texas, Pennsylvania, Louisiana, Oklahoma & Wyoming.
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