Green Mountain Energy Review

Quick Facts

Is Green Mountain Energy good? Green Mountain is the real deal on renewable commitment—29 years of 100% clean energy. But their rates run 17.5-21.7c/kWh while budget providers sit at 12-13c. You’re paying a steep premium for environmental credibility.

• Parent Company: NRG Energy (NYSE: NRG)—same parent as Reliant, Direct Energy, and Cirro
• Years in Texas: 29 (founded 1997)
• Best For: Customers who consider green energy a real priority, not an afterthought
• Avoid If: Price matters most—Green Mountain rates are 40-75% above budget providers
• Deposit Required: Conditional (credit-based; returned after 12 months of on-time payments)

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Company Overview

Green Mountain started selling 100% renewable electricity in 1997—five years before Texas even deregulated [Company website]. They moved to Texas in 2000 and have never sold a conventional electricity plan. Every product they offer is backed by renewable energy certificates.

That single-mindedness costs real money. Their current rates on ComparePower run 17.5-21.7c/kWh at 1,000 kWh [ComparePower API, April 2026], while budget providers like Gexa and Frontier sit around 12-13c. On a typical Texas household using 1,200 kWh/month, that’s $60-$110 more per month. Over a year, $700-$1,300 extra.

NRG Energy [NYSE: NRG] bought Green Mountain in November 2010 for $350 million [NRG press release]. Same Fortune 500 parent as Reliant, Direct Energy, Cirro Energy, Discount Power, Stream Energy, and XOOM Energy. Your monthly payment goes to the largest competitive power generator in the U.S. Green Mountain operates as its own brand within NRG, but the money flows to the same place.

Their Houston headquarters holds the city’s first LEED Platinum certified tenant office space [Company website]. About 650 employees across 11 offices nationwide.

How Their Green Claims Actually Work

Here’s where most people get confused. Green Mountain’s “100% clean energy” doesn’t mean wind farm electrons travel directly to your house. That’s physically impossible on a shared grid. Here’s what actually happens:

Renewable Energy Certificates (RECs): For every kilowatt-hour you use, Green Mountain purchases a REC from a wind or solar generator on the ERCOT grid [Green-e certification records]. One REC represents one megawatt-hour of renewable electricity that was generated and fed into the Texas grid. Your money pays a renewable generator for the environmental attributes of their output.

Green-e Energy certified: A nonprofit called the Center for Resource Solutions audits Green Mountain annually to verify they actually bought enough RECs to match customer usage [Green-e.org]. The RECs must come from facilities built within the last 15 years and must be generated within a 21-month window of when the electricity was used. This is real third-party verification, not a marketing claim.

Texas-specific sourcing: Green Mountain’s Texas RECs come from the ERCOT grid region—meaning Texas wind and solar farms [Company EFL documents]. They also operate three solar facilities: Dakota Solar Park near Dallas, Gable Solar Park near Houston, and Azure Solar Park near McAllen.

What this means in practice: Your premium doesn’t build new wind farms. It pays existing renewable generators for certificates proving they produced clean energy. Whether that’s worth 40-75% more per kWh is the question. The environmental impact is real but indirect—you’re increasing demand for RECs, which makes renewable generation more profitable, which theoretically encourages more of it.

How other providers’ “green plans” compare: TXU, Reliant, and others offer optional green add-ons that also use RECs. The difference is that Green Mountain’s entire business model is built on this—every plan, every customer, every kilowatt-hour. Other providers offer green as a premium upsell on top of their conventional plans.

Where Green Mountain Operates

Green Mountain serves all four deregulated utility territories in Texas: Oncor (Dallas-Fort Worth, Plano, Georgetown), CenterPoint (Houston metro), AEP Texas (Corpus Christi, McAllen, Abilene), and Texas-New Mexico Power.

They also sell in Illinois, Massachusetts, Maryland, New Jersey, New York, and Pennsylvania—making them one of the few Texas REPs with a multi-state footprint.

Green Mountain’s Houston headquarters is in a city they can serve. But Austin—where they were originally based—runs a municipal utility monopoly. They can’t sell there, and neither can any other provider on this site.

Plan Types Offered

Fixed-Rate “Pollution Free” Plans

Green Mountain’s core offering. All are 100% renewable. Current plans on ComparePower [April 2026, CenterPoint territory]:

Plan	Term	Rate (1,000 kWh)	ETF
Pollution Free Conserve 12 Preferred	12 months	17.5c/kWh	$150
Pollution Free e-Plus 12 Preferred	12 months	17.8c/kWh	$150
Pollution Free Conserve 24 Preferred	24 months	17.5c/kWh	$295
Pollution Free e-Plus 24 Preferred	24 months	17.8c/kWh	$295
Pollution Free Green Savings Plus 24 Preferred	24 months	21.7c/kWh	$295

The “e-Plus” plans include a renewable energy add-on component. The “Green Savings Plus 24” includes a $150 bill credit at 2,000+ kWh usage—but at 21.7c, you’d need consistently high usage for that credit to offset the rate difference.

Specialty Plans (Available on greenmountainenergy.com)

Go Local Solar — 100% Texas solar energy from specific solar parks (Dakota near Dallas, Gable near Houston, Azure near McAllen). Uses RECs from these facilities, Green-e certified.

Pollution Free Nights — Free or reduced nighttime electricity. Higher daytime rate compensates.

Pollution Free Weekend Warrior — Reduced weekend rates, higher weekday rates.

Pollution Free Watersaver — 100% wind energy plus a free Rachio smart sprinkler controller (retail value ~$249). Interesting angle on the energy-water connection.

Pollution Free Boost Your Green — Enhanced green features with additional renewable investment.

Solar All Nighter for EVs — Solar-backed plan with reduced nighttime rates optimized for overnight EV charging.

SolarSPARC — Solar incentive plan contributing to new solar projects.

Solar Buyback (Renewable Rewards)

If you have rooftop solar panels, Green Mountain offers three buyback tiers [Company website]:

Renewable Rewards Essentials — Credits capped at your monthly grid usage. If you export more than you consume, excess credits don’t carry over.

Renewable Rewards Solar Credit — Uncapped credits, but the credit rate is lower than your consumption rate. Good for systems that regularly overproduce.

Renewable Rewards Solar Max — Credits based on 15-minute real-time wholesale prices with no cap. Best for large systems or heavy overproduction—but wholesale rates swing wildly.

Requirements: Solar or small wind system under 50 kW, interconnection agreement with your utility, and a bidirectional meter (utility charges for installation pass through on your Green Mountain bill).

What They Don’t Offer

• Prepaid plans — No option for customers who can’t pass a credit check
• Non-renewable plans — Everything is 100% green (by design)
• Indexed/wholesale-pass-through plans — No wholesale market tracking for standard residential

Deposit Requirements

Green Mountain runs a soft credit check on every new customer [Company website, multiple review sources]. If your credit passes, no deposit. If it doesn’t, expect a deposit based on PUCT guidelines—typically the cost of two average monthly bills.

Deposit waiver options:

• Good credit score (specific threshold not published, but 650+ is the industry norm)
• Letter of credit from a previous provider showing good payment history
• Seniors and customers under medical hardship may qualify for waivers (not automatic—you need to request it)

Deposit return: After 12 months of on-time payments, Green Mountain applies your deposit as a bill credit [Multiple verified sources].

No prepaid escape hatch: Unlike Reliant (which offers Flex Pay) or TXU, Green Mountain has zero prepaid options. If your credit is rough, you either pay the deposit or look elsewhere. Payless Power or Pronto Power serve that market.

90-Day Satisfaction Guarantee

New customers can switch to a different Green Mountain plan within 90 days without paying an early termination fee [Company website]. This only applies to switching plans within Green Mountain—not to canceling and leaving for another provider.

Pricing: The Honest Math

Let’s compare Green Mountain to what’s actually available on the market [ComparePower API, April 2026]:

• Green Mountain range: 17.5-21.7c/kWh
• Budget provider range (Gexa, Frontier, etc.): 12-13c/kWh
• Average Texas household: ~1,200 kWh/month

Monthly cost difference:

• Green Mountain at 17.5c: $210/month
• Budget provider at 12.5c: $150/month
• Gap: $60/month, $720/year

At 21.7c (their highest current plan), the gap widens to $110/month or $1,320/year.

That’s serious money. The question isn’t whether Green Mountain is legitimate—they are. The question is whether verified REC purchases and Green-e certification are worth $720-$1,320/year more than a budget provider. For some people, absolutely. For most, that’s a hard sell when the electrons on the wire are identical.

Sun Club: Where Some of Your Premium Goes

Green Mountain runs the Sun Club, a grant program that has donated over $15 million since 2002 for 174 solar and sustainability projects at nonprofits [Company website]. Grants fund actual solar installations—a recent one gave $118,000 to Community Garden Kitchen in Collin County for a solar array and battery storage.

This is the most tangible thing your premium pays for beyond RECs. Real panels on real buildings. Whether $15 million over 24 years moves the needle on a Fortune 500 company’s balance sheet is debatable, but the projects themselves are genuine.

Customer Service: The Real Story

Green Mountain’s service is mid-tier—adequate but not a standout.

Contact channels:

• Phone (existing customers): 1-866-785-4668, available 24/7
• Phone (new customers): 1-833-561-6993, available 24/7
• Live chat: 24/7 through the customer portal
• Email: Contact form with 48-hour response time
• App: Green Mountain mobile app (iOS and Android) for usage tracking, bill pay, and green living rewards
• Best calling times: Wednesday 11:30 a.m.-6 p.m., Thursday-Friday 11:30 a.m.-8 p.m. [Company website]

Worth knowing:

• Customer rating of 4.8/5 on Texas Electricity Ratings (17,329 reviews)—genuinely strong
• Staff understand renewable energy and can answer sourcing questions
• Disconnection requests handled Monday-Friday, 8 a.m.-8 p.m. CT only (not 24/7)
• Single bill structure: your bill includes both generation and TDU delivery charges

The catch:

• No prepaid means credit problems lock you out entirely
• At 17.5-21.7c/kWh, billing mistakes hurt more than they would at 12c
• Power outages go through your utility (Oncor, CenterPoint, etc.), not Green Mountain—same as every other provider
• Late payment fee: 5% of overdue balance after the 16-day payment window

The NRG Family Connection

Green Mountain, Reliant, Direct Energy, Cirro, Discount Power, Stream Energy, and XOOM Energy all share the same parent: NRG Energy. This matters because:

1. Your “green premium” flows to a company that also profits from conventional generation. NRG operates natural gas and coal plants alongside its renewable portfolio.
2. The brands compete with each other. Discount Power (also NRG) often undercuts Green Mountain by 5-8c/kWh. Same parent company. Different pricing strategy.
3. Customer data likely crosses brands. NRG’s retail operations share infrastructure. Your account history at Reliant is visible when you switch to Green Mountain.

None of this makes Green Mountain dishonest. But “green company” and “green brand owned by a conventional energy conglomerate” are different things. Know what you’re buying.

Who Green Mountain Actually Works For

Choose Green Mountain if:

• Environmental impact through verified REC purchases matters enough to pay $720-$1,320/year extra
• You want a provider where every plan is 100% renewable—not a green add-on buried in the fine print
• You have solar panels and want a buyback program with multiple tier options
• You value Green-e third-party certification over unverified “green” marketing from other providers
• 29 years of renewable-only track record matters to you

Look elsewhere if:

• You’d rather spend that $720-$1,320/year on your own solar panels—which actually reduce grid demand
• You need prepaid service (Payless Power, Pronto Power)
• You want free nights, time-of-use pricing, or specialty plan structures beyond basic fixed-rate
• “Green” is nice but not worth a 40-75% rate premium
• You care about funding new renewable infrastructure rather than purchasing certificates from existing generators