In short: Shore power is quietly becoming the most important service a UK marina sells. Smart pedestals, per-berth metering, load management and the first wave of electric boat charging all turn the humble pontoon bollard into a connected asset, and every one of those capabilities depends on a data connection that most marinas cannot currently deliver past the office wall. One private 5G network across the basin carries the lot.
Key Takeaways
- Shore power is shifting from amenity to revenue line — with electricity costs still elevated, marinas that meter and bill per berth recover tens of thousands of pounds a year that flat-rate tariffs quietly give away.
- Electric boats make the pontoon a grid edge — marine fast-charging networks and electric tenders are arriving at UK harbours, and charge-point telemetry, load balancing and billing all need live connectivity at the water's edge.
- The network is the missing layer, not the hardware — smart pedestals and chargers exist today; what fails is the WiFi run down 400 metres of exposed pontoon, which one private 5G signal across the whole basin replaces.
In a nutshell
What is shore power, and why does it suddenly matter?
Shore power is the electricity a boat takes from the berth: the 16 or 32 amp supply from the pedestal on the pontoon that runs the battery charger, the fridge, the dehumidifier and, increasingly, everything else aboard. For decades it has been the least interesting asset a marina owns, a galvanised bollard wired back to a distribution board, included in the berthing fee or billed from a card meter that a member of staff walks the pontoons to read.
Three things have changed. Firstly, electricity got expensive, and it has not really come back down; a marina absorbing the consumption of several hundred berths on a flat-rate tariff is now carrying a cost line that would have been a rounding error a decade ago. Liveaboards and winter dehumidifiers make that line lumpy and unfair: the weekender subsidises the boat that runs a heater all December. Secondly, the hardware caught up. Smart pedestals with per-socket metering, remote switching and pay-as-you-go billing, from UK suppliers such as Rolec with its BerthVend system, mean the marina office can see and charge for every kilowatt-hour without anyone walking a meter route. Thirdly, and most interestingly, the boats themselves are beginning to electrify.
Put those together and shore power stops being background infrastructure. It becomes a metered, managed, billable service, arguably the most significant new revenue and cost-control opportunity in the harbour. But every part of that sentence assumes the pedestal can talk to the office, and that is where most UK marinas hit a wall.
Why is per-berth metering worth the trouble?
The arithmetic is straightforward and worth doing honestly. Across roughly 400 UK marinas and something like 110,000 berths (British Marine and The Yacht Harbour Association figures), electricity is typically handled one of three ways: bundled into the berthing fee, sold through coin or card meters, or estimated and recharged annually. Each leaks money or goodwill. Bundling means the marina eats every price rise and the heaviest users are subsidised by the lightest. Card meters create queues at the office and dead pedestals at 9pm on a Friday. Annual estimates generate exactly the disputes you would expect.
Per-berth smart metering changes the model: the berth-holder pays for what they use, at a tariff the marina sets, through an app or account, with the marina able to switch a socket remotely when a boat leaves or an account lapses. Operators who have made the switch report recovering the pedestal investment within a couple of seasons on electricity recovery alone, before counting the staff hours saved. There is a trade-off worth naming: metering makes the true cost visible to berth-holders, and some will grumble at paying for what was previously "free". In our experience the fairness argument wins, because most boats use very little and were previously paying for the few that use a lot.
The catch is communications. Every smart pedestal needs a data path back to the management system. On a pontoon array that means either pulling data cabling through trunking that is exposed to salt water, movement and boatyard accidents, or relying on WiFi that, as we set out in our look at marina-wide connectivity, rarely survives past the second pontoon finger. Some pedestal vendors fall back to putting a roaming SIM in every unit, which works but hands the marina a per-device subscription bill and a dependency on whichever public network happens to graze the basin.
Are electric boats actually coming to UK marinas?
Sooner, and more concretely, than most berthing plans assume. Aqua superPower, a British company, has been building out a marine fast-charging network with installations in Plymouth and along the south coast; Plymouth itself has positioned as the UK's testbed for electric watercraft, with electric ferry and workboat trials in the Sound. UK builders such as RS Electric Boats are shipping electric RIBs aimed at exactly the sailing clubs, harbour authorities and superyacht tenders that live in marinas, and mainstream engine manufacturers now all have electric outboard ranges. Inland, the case is even clearer: electric narrowboats and day boats suit the canal network's speeds perfectly, which is why inland operators are watching this closely.
Nobody should overclaim here. Electric boats are a small fraction of the UK fleet and will remain so for years; a marina does not need a fast charger on every hammerhead by next season. But the direction is set, and the infrastructure question lands on the marina either way, because the marina is the natural grid edge: it is where the boats sit idle for 95% of their lives, where the power supply already exists, and where a mixed estate of car-park EV chargers, electric tender charging and conventional shore power will all contend for the same site supply.
That contention is the real engineering problem. A typical marina's incoming supply was sized for lighting, a fuel pump and a few hundred trickle-charging batteries, not for DC fast charging. The answer is rarely a new grid connection (slow and expensive) and usually load management: charge-point telemetry, dynamic balancing between chargers and pedestals, and scheduling against the site's half-hourly tariff. Open protocols such as OCPP handle this well, but they assume every charger and pedestal has a live, reliable data connection. Which returns us, again, to the network.
Why does the network keep being the blocker?
Because a marina is close to the worst environment enterprise WiFi ever meets: hundreds of metres of moving steel and water, no walls to mount access points on, salt on every connector, and a forest of masts and hulls between the antenna and the client. The conventional answer, an outdoor access point every 30 metres down every pontoon with armoured cable in the trough, is exactly the AP-sprawl we have argued against before, and it is why so many marinas have berth-holders fighting for signal on dongles and CCTV that stops at the shore.
Private 5G approaches the same basin from the opposite direction: one or two radios on the harbour office or a mast, licensed interference-free spectrum under Ofcom's shared access regime, and a signal engineered to cover every berth, the hardstanding, the fuel berth and the car park. Pedestals, chargers, cameras and berth sensors take an industrial router or a SIM; there is no per-device public-network subscription, no cable in the trough, and the same network carries the berth-holder connectivity the marina can resell. One network, many services, which is precisely the economics an SME marina needs, because no single application justifies the infrastructure on its own but the stack of them comfortably does.
The honest trade-off: a private network is a bigger first decision than bolting one more access point onto the office. It suits operators who intend to run shore power, security, metering and berth-holder WiFi as connected services over the next decade, not those looking for a quick patch for one dead pontoon.
What should a marina operator do now?
Three practical steps, in order. Firstly, get the measurement baseline: even a partial season of per-berth metering data tells you what your electricity is really costing and who is consuming it, and turns the pedestal-upgrade business case from guesswork into arithmetic. Secondly, when you specify pedestals or your first marine charge point, treat communications as a first-class requirement: ask the vendor exactly how each unit gets its data back, what it costs per unit per year, and what happens when the public signal at the far hammerhead is one bar. Thirdly, map every connected thing the site will want within five years, shore power, chargers, CCTV, gate access, berth sensors, berth-holder internet, and cost the network once, for all of them together, rather than five times badly.
We build and manage private 5G networks for exactly these environments: exposed, linear, over water, and owned by operators with an SME budget rather than a container terminal's. If shore power is about to become your biggest service line, talk to us about the network underneath it.