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Calisen: The Invisible Giant of Smart Energy
A £380M revenue powerhouse quietly replacing Britain's energy infrastructure
While fintech startups chase the latest AI trends, Calisen is performing the unglamorous, capital-intensive work of physically upgrading Britain's energy grid. They're not building chatbots—they're installing smart meters in millions of homes, and generating $380.7M in revenue while doing it.
"Calisen proves that boring infrastructure plays can be more defensible than trendy SaaS products."
The B2B2C Infrastructure Play
Calisen operates in the critical layer between energy suppliers and consumers. Their business model isn't sexy—it's about installing and maintaining smart metering infrastructure at scale. With 1,110 employees and operations across the UK, they've built a moat through sheer operational complexity and capital requirements. This is the type of business that VCs struggle to fund but generates massive, predictable cash flows once established.
Traffic & Brand Dynamics
With only 7,385 monthly visits and a global rank of #3,009,743, Calisen is invisible online—and that's exactly the point. Their 51% organic traffic suggests people are searching for them directly, not stumbling upon them. The top keywords reveal the story: 'calisen' (710 volume) and 'calsien group' (60 volume) show brand recognition, but 'landis gyr careers' (470 volume) and 'lowri to market street manchester' (410 volume) indicate they're a destination for job seekers and B2B partners, not consumers.
The 2/5 Trustpilot rating from 157 reviews is telling. Calisen isn't trying to win popularity contests—they're executing on infrastructure contracts. For founders building in energy or hardware, this is a masterclass in focusing on operational excellence over consumer brand building. Their tech stack (Tailwind, Bootstrap, PWA) is pragmatic, not bleeding-edge, reflecting a company that invests in tools that work, not tools that trend.
- Capital-intensive infrastructure moat: Smart meter installation requires massive upfront investment and operational scale
- B2B2C positioning: They work through energy suppliers, avoiding direct consumer relationship management
- Low digital footprint = high operational footprint: Their invisibility online signals focus on field operations, not content marketing
- Trustpilot as a red herring: 2/5 rating reflects B2B infrastructure reality, not consumer SaaS expectations
The Anti-Startup Success Story
Calisen wins by doing the hard, unsexy work that scales. For product builders: sometimes the best moat is the one that's too expensive for competitors to replicate.
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Smarter Energy For All - Calisen
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Reviews (20)
Amazing service from Vin 🌟
Amazing service from Vin 🌟. He came to sort an issue out with my gas meter last week and he has gone above and beyond to help me when i had another issue with my electric having no supply. He communicated with me directly to resolve my meter issue and he arrived to me very quickly so im not left without power for long . 5 star service i cant be happier
Great service on new year eve no power…
Great service on new year eve no power just called up Scottish power within 1 hour engineer arrived excellent engineer Vinay got us back on supply within 45 mins thank you so much calisen for great service my family so much appreciated it!
Had smart meter installed all seemed…
Had smart meter installed all seemed well, however it turns out no readings being sent to my electricity provider and I cannot read the meter the low cost night rate has disappeared. My electric company have raised the issue but no action other than a phone call asking me to take a reading.
Another example of poor service from Calisen
After a call from Scottish Power asking me to book for an Electricity smart meter to get fitted I made an appointment on 17/12/25 for a meter to be installed between 10 and 2 on 07/01/2026. I’ve been waiting for a couple of years for this as so far Scottish Power have said they can’t install a smart meter at my address. Got texts and emails from Calisen confirming the appointment then today after clearing access and waiting at home, I got a call from them at 1pm to say engineer not coming and earliest reschedule they could offer is 28/01/26 - 3 weeks away. As soon as I agreed to the new date he hung up, no apology! Why are Scottish Power and other suppliers still using this incompetent supplier???? Having no smart meter is costing me a fortune as I am not able to get on an EV tariff until the meter is fitted. Will update in 3 weeks if they turn up then but from reading other reviews I think my pain is just beginning!!
Awful customer service
Awful customer service. We've had two meter readings cancelled after the allocated appointment on the day. This means waiting at home and rearranging my working day and fitness classes on both occasions. On an earlier occasion, they refused to turn up when we had arranged a concierge with access to the meter and also access to our flat. The engjneer was very rude on the phone despite the concierge already being in our flat.
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Technology Stack
calisen.com uses 16 technologies across their website including Font Awesome, HSTS, Vercel, and more.
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Traffic & Audience
calisen.com receives approximately 7.4K monthly visitors and ranks #3,009,743 globally. The website has a bounce rate of 65% with visitors viewing an average of 1.7 pages per visit. Users spend an average of 0:50 on the site.
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This page provides publicly available information about calisen.com. Data is collected from various public sources and may not always be up to date. For the most accurate information, please visit calisen.com directly at https://calisen.com.