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Best Electricity Companies in San Marcos

We ranked 8 electricity companies serving San Marcos. Here's who's worth considering — and why.

Rhythm Energy logo
#1 in San Marcos
Rhythm Energy
Best for solar homes
Deregulated — You can choose Population: 68K Hays County

San Marcos Electricity Company Rankings

Ranked by overall value, customer service, and plan options for Oncor customers.

1
Rhythm Energy logo

Rhythm Energy

Top Pick
★ Best for solar homes
Low
2
TXU Energy logo

TXU Energy

★ Best for customer service
Low
3
Green Mountain Energy logo

Green Mountain Energy

★ Best for green energy
Low
4
Reliant Energy logo

Reliant Energy

★ Best mobile app experience
Low
5
Frontier Utilities logo

Frontier Utilities

★ Best for budget shoppers
Average
6
Gexa Energy logo

Gexa Energy

★ Best overall value
Low
7
4Change Energy logo

4Change Energy

★ Best charitable giving
Average
8
Discount Power logo

Discount Power

★ Lowest rates available
High
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About Oncor

Oncor is the transmission and distribution utility (TDU) for San Marcos. They own the power lines and handle outages, but you choose which retail electric company bills you for your electricity usage.

What this means for you:

  • Same power lines, same reliability — no matter which company you choose
  • Outages are always handled by Oncor
  • Your electricity company handles billing, rates, and customer service

Popular Comparisons

Head-to-head comparisons of electricity companies serving San Marcos.

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TXU vs Reliant
See full breakdown
VS
TXU vs Gexa
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VS
Gexa vs Frontier
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VS
Green Mountain vs TXU
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See all company comparisons

Browse by Category

Filter companies by what matters most to you.

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Companies with low or no deposit requirements
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Our picks for most Texas shoppers

San Marcos Electricity FAQ

What is the best electricity company in San Marcos?
Based on our analysis, Rhythm Energy ranks #1 in San Marcos for overall value and service. TXU Energy and Green Mountain Energy are also excellent choices depending on your priorities.
How many electricity companies serve San Marcos?
San Marcos is served by Oncor and has 8+ retail electricity companies to choose from. You can switch companies anytime without changing your power lines or service reliability.
Can I choose my electricity company in San Marcos?
Yes! San Marcos is in a deregulated area of Texas (Oncor service territory). You have the power to choose from dozens of electricity companies competing for your business.
What is the cheapest electricity company in San Marcos?
Rates change frequently, but companies like Discount Power and Frontier Utilities typically offer the lowest rates in the Oncor area. Compare current rates on our plans page for today's prices.
What utility company serves San Marcos?
Oncor is the transmission and distribution utility (TDU) for San Marcos. They own and maintain the power lines and handle outages. However, you choose your retail electricity company for billing and rates — Oncor delivers the power no matter which company you pick.
How do I switch electricity companies in San Marcos?
Switching is easy and takes about 5 minutes. Pick a new company, sign up online or by phone, and they handle the rest. There's no service interruption — Oncor continues delivering power to your home. Your old company is automatically notified. Most switches complete within 1-2 billing cycles.

"I like how fast the site found energy companies without deposits and the application process was amazing."

— Chimere J., Texas

Compare Rates in San Marcos

See current rates from these companies.

(877) 418-2140

Last updated: · Rankings based on value, service, and reliability