Endorsed by Which?

GreenGen UK Limited


18 Reviews

Opening Hours
Today -
  • Monday 09:00–17:00
  • Tuesday 09:00–17:00
  • Wednesday 09:00–17:00
  • Thursday 09:00–17:00
  • Friday 09:00–16:30
  • Saturday - Closed
  • Sunday - Closed

Why you can trust this trader

After undergoing rigorous assessment to become endorsed, every Which? Trusted Trader agrees to our Code of Conduct. This gives consumers the reassurance that they have the best possible protection and adds an extra layer of security to ensure best practices and procedures are followed. Which? fully investigates any breaches and will take any necessary action to ensure consumer protection.


GreenGenUK is one of Cornwall's leading providers of renewable energy solutions.

Since opening in 2011, GreenGen has built a reputation for providing high-quality, bespoke renewable installations that are tailored to meet the needs of the individual customer and property.

MCS-approved in all the technologies we offer, our customers are guaranteed the highest quality renewable solutions. In addition, all GreenGenUK installations are eligible for government incentives such as the Renewable Heat Incentive and Smart Export Tariff.

We design, install and maintain all of the following renewable technologies:

- Solar PV (photovoltaic)
- Battery Storage
- Air Source Heat Pumps
- Ground Source Heat Pumps
- Solar Thermal

GreenGen offers free site assessments, surveys and guidance to all customers in the South West. Thanks to our range of expertise, we are able to help take homeowners through from initial consultations through to installation.

What we do

  • Renewable energy

    • Solar panels
    • Air source heat pumps
    • Battery storage
    • Ground source heat pumps
    • Home energy analysis
    • Solar Panel Maintenance
    • Solar water heating
  • Plumbers

  • Electricians

  • Heating contractors

    • Central heating systems (installation and servicing)
  • Smart Homes

  • Lighting contractors

  • Boiler, central heating and gas engineers

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

18 reviews
Customer Service
Sort by
Great service with extremely efficient and polite employees
Customer Service
GreenGen UK have recently installed an air source heating system in our property. Their organisation and planning was excellent, and their on site team of plumbers and electricians were superb. Project management on site was fantastic. They worked extremely efficiently and were polite, helpful and courteous throughout...we will definitely use GreenGen again for future project work on our house.
Customer in Cornwall Posted on 06/07/2022 , work completed 28/06/2022
Installation of Air Source Heat Pump
Customer Service
GreenGen UK are a very professional company starting with the first on-site survey through to the design, installation and final hand over of my new heating system. I met a number of their employees throughout the project and they were all courteous, carrying out their various tasks to a very high standard. I will definitely recommend this company to family and friends.
Reg in Cornwall Posted on 24/04/2021 , work completed 26/03/2021
Delighted client!
My solar system was underperforming, I contacted a couple of local firms and only GreenGen replied. They quoted their call-out fee and hourly charge beyond this. Their engineer was fantastic. Nothing was too much trouble. He managed to repair the system without the need for costly replacement parts. A more unscrupulous firm wouldn’t have done this, I would have been none the wiser and would have taken the advice given. I thoroughly recommend them to others and will use them again when needed.
Customer in Cornwall Posted on 23/06/2020 (Reviewer did not use service)
Air source heat pump
I initially contacted this form for advice, they were clear, speedy in the response and put me under no pressure to proceed further. After further research, I decided to go with GreenGen. Their service was efficient, professional, and timely, with clear costings which were competitive and maintained, especially as this was retrofit with existing radiators. Follow up has been helpful and the whole experience has been stress-free.
Customer in Cornwall Posted on 18/05/2020 (Reviewer did not use service)
Very exceptional work, intelligent and considerate approach
Customer Service
Excellent work in preparation and installation of the pipe work radiators and complete heat pump system. GreenGen were sensitive to the building and the positioning of heat pump with regard to the proximity my neighbour, thus creating extra work for the team. I was given notice by the plumber beforehand of each day’s schedule and he was systematic, methodical, considerate of my living conditions during the installation. The electrician was also excellent and very helpful. The disruption was kept to a minimum. The works were completed ahead of the original deadline and apart from one or two minor problems, which were easily resolved, the system has worked perfectly. I could not be more pleased!
Customer in Cornwall Posted on 30/04/2020 , work completed 28/03/2020
Solar PV + heat pump + battery installation
Customer Service
We were very impressed with proprietor Rob Carey who demonstrated a great deal of knowledge of alternative technologies as well as honesty and integrity. These qualities were important since we were relying on him to educate us into what kind of system might actually work for us. Greengen's quotations were entirely reasonable so we went ahead with the installation, which happened slightly ahead of schedule. We were equally impressed by the quality of the tradespeople who carried out the work. They were a pleasure to be around. Greengen employs its own tradespersons and only used a subcontractor for putting up the scaffold for the PV installation. The system works very well indeed and we have no issues with it. We have recommended the company to several of our friends and will continue to do so.
Customer in Cornwall Posted on 28/04/2020 , work completed 30/08/2019
Solar panels installation
Customer Service
I had a couple of quotes for installation of solar panels and there wasn't much to choose between them but I opted for GreenGen as they had recently installed for a neighbour who was pleased with them. The installation was done sooner than I'd expected (good) and was very straightforward in that I was able to go out and leave the engineers to get on with it. Time taken was about what they had told me to expect. Engineers were friendly and tidy. Everything is monitored from an app that gives me a clear idea of how much the panels are producing and how much I'm consuming. Installation was in mid-winter and at first the panels were generating very little but now in April they are typically generating between 50% and 90% of my electricity. I'd have preferred for the scaffolding to be removed sooner, but apart from that I'm very pleased with GreenGen's installation.
Customer in Cornwall Posted on 27/04/2020 , work completed 16/01/2020
Courteous and efficient
Customer Service
We have had solar panels installed by Greengen uk. Because of some shading they installed Solar Edge. Because of the rain at that time of the year, it made it very difficult for them to install them. However, once there was a dry day, they were back and worked very efficiently. A very pleasant company to deal with and very transparent with what we can and cannot achieve from the installation. They were recommended to us and we recommend them highly.
Customer in Cornwall Posted on 24/04/2020 , work completed 20/02/2020
Prompt, professional and efficient service
Customer Service
GreenGen installed a air source heat pump. This was completed to the timetable they gave us. Very helpful fitters who were very tidy and the sales/office staff we have found also helpful with RHI payments. Completely satisfied.
Customer in Cornwall Posted on 04/08/2019 , work completed 01/05/2019
100% satisfied.
Customer Service
Following a quote from a 'dodgy' company, our experience of GreenGen UK left us feeling 100% satisfied. From the initial meeting to quote for an Air Source Heat Pump, through ensuring correct specification, installation and follow-up, everyone we have met from GreenGen UK have proven to be very professional. They answered all of our questions, both technical and with regards to aesthetics (it has to look good!!), leaving us in no doubt as to what they were doing, the benefits of the installation and even dealt with the RHI on out behalf effectively, efficiently and in a timely manner . The quote was easy to understand, laid out clearly and concisely. The quoted costs were adhered to throughout and final payment not taken until we were satisfied and even given a week to ensure we were more than happy. The work was carried out by a very experienced team who were almost OCD in their attention to detail - it is a work of art!! In addition to this they were receptive to our thoughts and any concerns we may have had during the course of the installation. All in all the final part of our transition from fossil fuels (already solar panel/battery) went smoother than we could fairly have expected and the cost was perfectly reasonable. Everyone we dealt with on behalf of Greengen UK was a pleasure to business with.
Customer in Cornwall Posted on 01/07/2019 , work completed 17/05/2019