Green Mountain Energy Review 2026

Green Mountain Energy holds a unique place in Texas electricity history: the company was founded in 1997 specifically to offer renewable electricity to consumers — making it one of the first REPs in the nation to build a business entirely around clean energy supply. Operating from Austin, Texas, Green Mountain pioneered the concept of consumer choice in renewable electricity and helped normalize green power purchasing in the years before climate consciousness became mainstream. The company is now a subsidiary of NRG Energy.

Green Mountain Energy serves all ERCOT TDU territories and offers exclusively renewable electricity plans — 100% of supply is matched with renewable energy certificates from wind, solar, and other clean sources. Plan types include fixed-rate 12- and 24-month plans, a Pollution Free Nights option, and a solar buyback plan for rooftop solar customers. Rates typically range from 11 to 16 cents per kWh, reflecting the green supply premium, though the gap versus conventional rates has narrowed significantly as wind and solar costs have fallen.

Pros: 27-year track record as a renewable-first company, 100% clean electricity across all plans, strong brand trust among environmentally motivated customers, NRG financial backing.

Cons: Rates are generally above the market average for equivalent plan terms; being 100% renewable means no conventional rate option for budget-switching customers.

Unique Differentiator: Green Mountain Energy is the only major Texas REP that has offered exclusively renewable electricity for its entire existence — a brand integrity claim no competitor can replicate, particularly meaningful for customers skeptical of greenwashing.

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