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Thomas Energy is an electrical contractor that, by its own account, is owned and operated by Thomas Campbell, led by a father-daughter team and working the greater Bangor area with over 30 years of experience. A 2024 customer said Thomas Energy of Holden, ME installed their generator, that Mr. Campbell, his daughter and staff kept them informed through the entire process, and that the costs were very reasonable. A 2024 customer said Thomas and crew installed a generator and did an electrical update, explained everything as it was being done, and arrived on time for both the estimate and the work dates. A 2024 customer wrote that their Generac generator was up and running 5 months before other local companies said they would get it done. A 2023 customer said the company installed heat pumps and a heat pump water heater and upgraded their electrical panel. A 2022 customer said it replaced an existing oil boiler and water heater tank system with a propane tankless heating system. In a 2024 r/maine thread, a Reddit commenter said Thomas Energy installed their generator and their heat pump. A 2024 customer said they had worked with Teresa and her dad for 5 years and called their pricing, even for emergency calls, extremely reasonable. On Google the company shows 5 stars from 29 ratings.
“Thomas Energy installed my generator and my heat pump. Great folks, solid company.”
An amazing company. I highly recommend Thomas Energy. They are honest and dedicated to their work. A great family run business with very skilled technicians.
Thomas and crew recently installed a generator and did an electrical update at my home. They were fast and efficient and explained everything as it was being done. Bonus points for arrival for the estimate and dates to work on time. There’s a reason everyone gives Thomas Energy 5 stars.
Very professional, respectful, all around fantastic service. Never seen a happier group of people working around my house.
We recently bought a generator and had it installed by Thomas Energy of Holden, ME. Mr. Campbell, his daughter and staff did an excellent job. They kept us informed through the entire process, made themselves available when we had questions and generally performed in a pleasant, professional manner. The costs were very reasonable. I'm looking forward to having them service our equipment. They are an excellent group to work with. I would recommend them to anyone looking for a generator, or electrical services of any type.
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Certified attributes are verified against the public registry. Others are the business's own statement.
1 change recorded — last scanned Oct 29, 2026.
Typical your area range for this kind of work, from regional averages — not a quote from Thomas Energy. Use it to sanity-check bids, then get the real number in writing.
Standard receptacle swaps — a new dedicated circuit is a bigger job ($350–$750).
Flush mounts, pendants, chandeliers — hung on existing boxes.
Estimated range
$530 – $1,100
Typical electrical project around $820
Solar layout designed around a whole-home generator4.6
29 years in business3.4
State-verified HVAC license2.5
