Just as impressive: Its overall J.D. Power score for customer satisfaction. The 1,000 point score considers price, communications, corporate citizenship, enrollment and renewal, and customer service. At 709, Green Mountain Energy scored the highest of all Pennsylvania companies, well above the 669 state average, and a solid 20 points ahead of the next closest provider we looked at — Constellation.

1Security and Home Automation Services are offered by NRG Connected Home LLC d/b/a Reliant, TXB19469, 1201 Fannin Street, Houston Texas 77002. Electricity services are offered by Reliant Energy Retail Services, LLC d/b/a Reliant, PUCT Certificate #10007. Both are wholly owned by NRG Energy, Inc. Terms and conditions apply. For complete terms and conditions, visit reliant.com/connectterms.
1Security and Home Automation Services are offered by NRG Connected Home LLC d/b/a Reliant, TXB19469, 1201 Fannin Street, Houston Texas 77002. Electricity services are offered by Reliant Energy Retail Services, LLC d/b/a Reliant, PUCT Certificate #10007. Both are wholly owned by NRG Energy, Inc. Terms and conditions apply. For complete terms and conditions, visit reliant.com/connectterms.
Although electricity had been known to be produced as a result of the chemical reactions that take place in an electrolytic cell since Alessandro Volta developed the voltaic pile in 1800, its production by this means was, and still is, expensive. In 1831, Michael Faraday devised a machine that generated electricity from rotary motion, but it took almost 50 years for the technology to reach a commercially viable stage. In 1878, in the United States, Thomas Edison developed and sold a commercially viable replacement for gas lighting and heating using locally generated and distributed direct current electricity.
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