Rated 3.5 / 5 from 12 reviews
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Alternate Energy AEI is driven by the knowledge that more renewable and energy efficiency installations, like solar means less dependence on expensive oil and electricity. Solar allows Hawaii families and businesses to keep more of their hard-earned dollars. All of our installers are AEI employees, not subcontractors. AEI takes full responsibility for every installation, no matter how large or small. We purchase high quality materials and systems direct from the manufacturer. Without a middleman, we can pass savings on to our customers.
Business details
  • Year established: 1993
  • Licensed
Services
Solar Attic Cooling
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Attic temperatures can exceed 160°F during hot summer days. Proper attic ventilation can reduce attic temperatures by up to 50°F.1 No matter how much insulation you have in your attic, heat can transfer into adjacent living spaces. In fact, extra insulation can actually trap heat and increase temperatures.
Solar Water Heating
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Solar collectors on the roof of your home are connected through a series of pipes to a solar water tank. City water pressure forces the cool water in your tank up these pipes and into the solar collectors. The collectors trap the sun's heat and transfer it to the water inside.
Photovoltaic
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Individual solar cells, made of thin layers of silicon, are grouped together to form photovoltaic (PV) solar modules which, when installed as a component of a complete solar system, generate electricity.' When sunlight strikes the PV solar module cells installed on the roof of your home, a chemical reaction releases electrons that generate an electric current.
Residential
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Alternate Energy, Inc., a 3rd generation, family-owned company, has been serving Oahu and Maui for more than 30 years. AEI takes great pride in helping Hawaii residents lower their electricity bills by installing high quality alternative energy systems that are as good for the environment as they are for business.
Commercial
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Our experienced technicians are employed by AEI, not subcontractors. We take full responsibility for every installation, repair and renovation, no matter how large or small. You can rest easy knowing that that you're doing business with a trusted company.
Reviews (12)
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Gwen Nolasco
May 23, 2022
I had my A unit cleaned by Cory, two years in a row, and I got to say that you need more employees like him out in the field, he very courteous professional. The last person I had before him did not do a very good job. He did not even take a look at my unit outside to clean it or inspect it. Thank you Cory for a job well done.
Eric Leung
May 20, 2022
Everything to process the paper work is quick but sloppy. Office guys don't know how the field guys does the work so the plans always changes. Field guys are good but only want to get the job done then bail; they don't care about their mess they leave behind etc. Getting assistance after will cost you. There are some great guys but over all for installation, they don't work as a team, rather as independent groups. 05/09 - response to owner I have no issues with working with Trevor and understand the whole internet setup - no grips about that.

Just stating the fact that some after installation services are not included, for public knowledge. Trevor is one of the better knowledgeable technicians and has been super helpful, efficient, and responsive.
Rob N. Rea Kealoha
Mar 19, 2022
Melissa and her team were very professional handling my services and kind spoken during our conversations. Thank you for continuing your great customer service for me and my fam.
Byron Chong
Sep 21, 2021
Current and future buyers beware. Quick to take your money, but when problems arise they don't even call back. 5 calls already after they identified 2 panels were inoperable. Not one call back. Secretaries are nice and admit they have problems with management responding. Save yourself the headache and go somewhere else for your PV and solar
Jan Amend
Jul 28, 2021
Feedback for Cory! He deserves special praise for his hard work for us, especially with fixing our air conditioners. Cory has been an outstanding employee for Alternate Energy! He is so courteous, kind, very competent and helped create for us, a plan for managing our systems including our air conditioner units associated with your system of solar panels. Cory was very careful to take the units apart, analyze the problems and resolved the issues thoroughly and professionally.

We had a AC water breakdown, some months ago, and we were very fortunate to have Cory fix the first unit. He was so professional and caring and kind, I asked to have Cory come back to help us again! He diagnosed the different problems of these two units on Friday and fixed them expertly! He is so caring, kind, expert and competent, I hope you will consider him for future promotions within your company! As a customer, Cory really represents the best of what I value in your company, products, and the personal caring professionalism of your services!
S. Freitas
Jul 22, 2021
After shopping around for PV for months, a close family friend referred us to Alternate Energy and we've been loyal customers ever since! Roy Skaggs took care of us when we purchased our original system and continues to provide excellent service when we called to add battery backup capabilities to our system. The installation crew are always very professional, friendly, and neat, answered our questions, and followed up after the install as well.

We're very happy with our PV system and would highly recommend Alternate Energy to our family and friends! If they sold systems on the Big Island I would definitely go back to them for a PV system on our daughter's house.
Darci B.
Feb 01, 2020
We installed a solar water heater (replacement of inoperable one and relocated from inside closet to outside storage), 18 PV panels and a Tesla battery. I had already signed contracts and started the process with Haleakala but I paid $1500 to cancel everything with Haleakala and switched to AE when Haleakala could not tell me what kind of PV panels were being installed. Alternate Energy installed Panasonic PV panels whereas Haleakala finally disclosed a China brand. Made the switch and with only 2-3 months left in 2019 they were able to expedite everything to ensure 2019 installation so I could capitalize on the last year of the 30% tax credits.

I really appreciate the quick install as I was able to get back around $23k on my taxes. I waited to post my first review until I received my first electric bill, which I just got, $26.25! I'm only paying the admin fee and green energy fee. I sold my dishwasher since I don't use one, but I'm happy that I can wash all my dishes with hot water throughout the day. I didn't have any hiccups or issues with any process of my installation. From beginning to end everything went fluidly.
Donna R. Ching
Jun 08, 2019
We had Alternate Energy put in our PV unit and AC for my home office last year. We were very impressed with their commitment to service and professionalism. They provided us with excellent advice regarding how big a system we needed and how to prepare our garage roof for the panels. This year we had to move our cable to reroof our home. We had gotten agreement from AE to move our cable before installing the new roof. We forgot to schedule their work, but when we called, they were at our house w/in 2 days to do the job. This was a great example of their commitment to service. D.R. Ching
Darryl Freeman
Dec 28, 2018
Alternate Energy Inc. was contracted for a solar related installation at our neighbors property back in January 2017, almost two years ago! They asked to dig a 6inch trench through our front yard and agreed to repair it. We had just grated the yard, landscaped and planted new grass. Today, we still have a 2foot by 30foot trench line with no grass growing, a yard full of small rocks, a huge pile of dirt next to a plywood covered hole.

We have made requests that you fix it, we were fed lies about who is responsible and the project status. The bottom line is that you have shown your business ethics to be minimal if existent.
Rochiel Encina Hokama
Mar 30, 2016
Don't go with this company. They will only take your money and when something goes wrong they will not help you.
Ma A.
Jul 03, 2015
Saw their add on Facebook, contacted them on 5/21/2015. Roy S. returned a quote in less than 24 hours. My 24K BTU Mitsubishi was installed 5 days later. Included filing for City and County Permits and HOA forms as needed.
Myrna Arakaki
Dec 03, 2014
Customer service is bad. Have a panel that's not working, called them 4 separate times and still no call back. Rethinking our decision to go with this company.