Green Mountain vs TXU Energy: Green vs Traditional
Complaint Comparison
PUCT Data • Jul-Dec 2025
Green Mountain Energy
TXU Energy
Green Mountain Energy and TXU Energy have similar complaint rates
Trust & Reputation
External ratings comparison
Trust Score is a weighted average: Google (40%), BBB (35%), Trustpilot (25%)
The Verdict
- You want 100% renewable and won't compromise
- You're willing to pay $10-20/month extra for real green energy
- Your electricity dollars supporting clean energy matters to you
- You don't need free nights, time-of-use, or plan variety
- You want free nights, time-of-use, or indexed plans
- Price matters more than environmental impact
- You want 15+ plan options to choose from
- You'll take TXU's green add-on instead of Green Mountain's core model
Category Breakdown
Green Mountain is 100% renewable--it's all they do
TXU has free nights, indexed, time-of-use, and more
TXU runs $10-20/month cheaper on comparable plans
More Texans have heard of TXU
At a Glance
| Factor | Green Mountain Energy | TXU Energy |
|---|---|---|
| Best For | 100% renewable, won’t compromise | Free nights, time-of-use, indexed plans |
| Price Level | Premium (higher) | Premium |
| Years in Texas | 27+ | 24+ |
| Month-to-Month | Yes | Yes |
| Green Plans | Yes (100% default) | Yes (upgrade) |
Bottom Line: Choose Green Mountain if 100% renewable is non-negotiable; choose TXU for plan variety and lower cost.
Overview
Green-first company vs. green-as-an-option. That’s the real difference.
Same grid. Same wires. When you flip the switch, you get the same mix of electrons as everyone else on ERCOT. But what you’re funding with your money is different.
Green Mountain has been 100% renewable since 1997—before Texas even deregulated. They’ve never sold a fossil fuel plan. Every dollar you pay them supports clean energy infrastructure.
TXU’s parent company (Vistra) operates coal and gas plants alongside renewables. Their green option is a checkbox you can add, not their core mission. When you pay TXU, you’re supporting a company that also burns fossil fuels.
The quick verdict: If green energy is the point, Green Mountain wins. If green energy is nice-to-have and you want more plan options (free nights, indexed, time-of-use), TXU wins. The premium for Green Mountain is real—$10-20/month more than TXU’s baseline plans.
The Core Tradeoff
Green Mountain has sold 100% renewable electricity since 1997. That’s it. No fossil fuel plans, no prepaid, no free nights gimmicks. Wind and solar only. If you sign up, every kilowatt-hour comes from clean sources.
TXU Energy sells electricity. All kinds. Fixed, variable, indexed, month-to-month flex, free nights, free weekends, time-of-use. They have green options too—but it’s a checkbox, not a mission. TXU’s parent company (Vistra) operates coal and gas plants alongside renewables.
Price Comparison
Green Mountain costs more. At 1,000 kWh/month, expect to pay $10-20 more per month than TXU’s baseline plans. That’s $120-240/year for the green premium.
But here’s the thing: TXU’s promotional rates expire. When your 12-month intro rate ends and you roll to month-to-month, Green Mountain’s steady pricing can look better. The gap shrinks when you compare Green Mountain to TXU’s renewal rates, not their teaser rates.
Customer Experience
Both have real customer service teams. Both have been around for decades.
Green Mountain customers tend to be happier—but that’s partly self-selection. People who choose Green Mountain did it for environmental reasons. They’re getting exactly what they signed up for.
TXU has more complaints in raw numbers because they have more customers. Per-customer, they’re fine.
The Verdict
Green Mountain wins on commitment. TXU wins on options and price.
Choose Green Mountain if:
- 100% renewable is non-negotiable—not a nice-to-have
- You’re willing to pay $120-240/year more for a company that’s been green from day one
- You want your electricity dollars supporting clean energy, not a company that also burns coal
- You don’t need free nights, prepaid, or specialty plans
Choose TXU if:
- Green energy is nice but you’d rather save $120-240/year
- You want plan variety (free nights, indexed, time-of-use)
- You’re okay adding green as an upgrade rather than default
- 24/7 customer support matters more than environmental commitment
The honest take: If you’re comparing these two, you probably care about green energy. The question is whether you care enough to pay $10-20/month more for a company whose entire mission is renewable power. There’s no wrong answer—just different priorities.
The budget green option: If you want green energy without Green Mountain’s premium, check Gexa Energy. Their parent (NextEra) generates more renewable power than any company in America, and their rates are lower than both Green Mountain and TXU.
Check current rates on ComparePower to compare pricing for your usage level.
Related Pages
Company Profiles
Best-For Categories
- Best Green Energy Companies — Green Mountain ranked #1 for 100% renewable
- Best Customer Service — TXU ranked #1 with 5-minute call times
- Best for High Usage — TXU ranked #2 for Smart Deal bill credits
- Best for Large Homes — TXU ranked #3 for 24/7 support
- Best for Seniors — TXU ranked #4 for budget billing
- Best Same-Day Electricity — Both providers offer same-day activation
- Best Month-to-Month Electricity — TXU Flex Plan for no-contract flexibility
Related Comparisons
Company Snapshots
Green Mountain Energy
- Parent Company
- NRG Energy (NYSE: NRG)
- Years in Texas
- 27+
- Headquarters
- Austin, Texas
- Deposit Required
- conditional
TXU Energy
- Parent Company
- Vistra Corp (NYSE: VST)
- Years in Texas
- 24+
- Headquarters
- Irving, Texas
- Deposit Required
- conditional
More Head-to-Head Matchups
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"I like that it searched multiple companies for me. So I don't have to search one by one. Saves time."
— Lacy L., Texas
See Current Rates
Compare current plans from both companies.
Frequently Asked Questions
Q: When should I choose Green Mountain Energy over TXU Energy? ▼
You want 100% renewable and won't compromise. You're willing to pay $10-20/month extra for real green energy. Your electricity dollars supporting clean energy matters to you. You don't need free nights, time-of-use, or plan variety.
Q: When should I choose TXU Energy over Green Mountain Energy? ▼
You want free nights, time-of-use, or indexed plans. Price matters more than environmental impact. You want 15+ plan options to choose from. You'll take TXU's green add-on instead of Green Mountain's core model.
Q: What is the main difference between Green Mountain Energy and TXU Energy? ▼
Green Mountain Energy wins on green energy. TXU Energy wins on plan variety, price, brand recognition. Both deliver identical electricity through the same wires—the difference is pricing structure, customer service, and plan options.