In short: Electrifying ground support equipment is the most achievable near-term lever UK airports have for cutting scope-one emissions. But e-GSE only delivers if charging is coordinated, vehicle telematics are continuous, and the apron has a wireless layer that legacy UHF and public mobile cannot give it. Private 5G is the unglamorous prerequisite under every Jet Zero commitment.
Key Takeaways
- Diesel GSE is a measurable scope-one source — tugs, belt loaders, GPUs and pushback tractors burn a meaningful share of an airport's direct emissions, and replacing them is the fastest decarbonisation the operator actually controls
- e-GSE only works if charging is networked — uncoordinated charging blows the apron's substation budget within a year of fleet conversion, so live state-of-charge data and smart scheduling are non-negotiable
- The apron is where the network gap lives — UHF voice, public 4G and patchy WiFi cannot carry the telemetry that an electrified, semi-autonomous apron generates, so private 5G becomes the foundational layer for everything net-zero downstream
In a nutshell
Why ground support equipment is the next big airport emissions story
UK airports have spent the last decade reducing the easy emissions: LED lighting, building energy management, on-site solar, switching terminal heat away from gas. Those are largely done. What remains visible on a CO2 ledger, and what an airport actually operates day-to-day, is the diesel fleet of vehicles that turns aircraft around: pushback tugs, belt loaders, baggage tractors, deicers, catering trucks, ground power units, air-start units, lavatory and water carts. There are typically several hundred of these vehicles per major UK airport, mostly diesel, and they run hard every operational hour.
The Department for Transport's Jet Zero Strategy targets net-zero airport operations by 2040, and the Airports Operators Association's net-zero roadmap puts ground operations at the centre of the scope-one effort because aircraft fuel is mostly scope three for an airport. Heathrow's Net Zero Plan, Gatwick's Decade of Change 2.0, Manchester Airports Group's CleanerSky and Edinburgh's Greater Good 2030 all commit to fully or substantially electrified airside fleets by the early 2030s. The CAA's environmental sustainability framework expects measurable progress at each five-year economic regulation reset.
Electrification is the mechanism. e-GSE is commercially available across nearly every vehicle category — TLD, Mototok, Kalmar Motor, Charlatte and others have full electric ranges — and the cost-of-ownership case stacks up if utilisation is reasonable. The slowdown isn't vehicles; it's the apron infrastructure to make them work.
The substation problem nobody warns operators about
A diesel tug refuels in three minutes at a single bowser. An electric tug needs an hour-and-a-bit of fast charging, and the airport's grid connection has a hard ceiling. Convert a fleet of 200 vehicles without changing how charging is scheduled, and the simultaneous-draw peak will trip the airport's substation, or — more often — force a multi-million-pound reinforcement of the DNO connection at the operator's cost.
This is the conversation that has slowed electric GSE rollouts across UK airports. It isn't the cost of vehicles or chargers; it's the apron's electrical headroom. There are three ways out:
- Increase the grid connection (slow, expensive, depends on the DNO)
- Add battery storage to flatten peaks (capital-intensive, takes apron real estate)
- Schedule charging to spread load across the operational day, with live telemetry feeding back into the schedule
The third option is the only one that scales without huge capex. And it depends entirely on the network. Every charger and every vehicle has to report state-of-charge, plug status, energy delivered and forecast availability into a single ops layer, in real time, across the whole apron — across the cargo apron, the terminal stands, the remote stands, the deicing pads and the GSE pool. That's a connectivity workload, not a charger workload.
Why the apron is the hardest network on the airfield
The terminal is easy to network. It's enclosed, it has structured cabling, it has multiple WiFi vendors competing for the same DAS-and-WiFi RFP every five years, and the passenger-facing connectivity is mostly fine. The cargo sheds are slightly harder but still tractable.
The apron is none of that. It's a vast, partly-open environment with metal aircraft creating multi-path reflections, jet bridges blocking line-of-sight, weather extremes, hard restrictions on cabling (you can't dig through pavement during operating hours), and a constantly changing layout as stands are reconfigured. Public mobile coverage is patchy because nobody designed it for ground operations. WiFi has been tried at every major UK airport and consistently fails to provide the seamless, deterministic coverage that vehicles in motion actually need.
Most airports have a UHF or VHF airband for voice and a separate ACARS-style data layer for aircraft, neither of which carries the telemetry an electrified, semi-autonomous fleet requires. The result is a patchwork of vendor-specific 4G dongles in vehicles, each with its own SIM contract, its own billing, its own gaps, and no shared ops view. The data is fragmented before it reaches the ops centre.
A managed private 5G network solves this in one go. Coverage is engineered to the apron's geometry — small cells on light columns and jet bridges, with overlapping cells handling the bays where aircraft create shadowing. Coverage extends across the cargo apron, terminal stands and remote stands as a single network. Devices roam seamlessly between cells without the handover failures that have plagued WiFi-based experiments. Latency stays under 20 ms for the use cases that need it.
The data layer underneath a net-zero apron
Once a private 5G apron exists, the electrification story becomes routine engineering rather than infrastructure pioneering. The vehicles report SoC, location, energy consumption per turnaround, and predicted endtime continuously. The chargers report plug status, available power, energy delivered and queue depth. The ops layer combines those into a real-time picture of what every asset is doing.
That makes several things possible:
- Smart charging schedules — vehicles are dispatched to chargers based on forecast usage, not opportunistically; charge sessions are throttled in concert with the substation's headroom; aircraft turnarounds are matched to vehicles with adequate SoC rather than forcing unplanned charge stops
- e-GSE pooling between airlines — most UK airports operate a mix of airline-owned and handler-owned GSE; pooling reduces vehicle count and improves utilisation, but pooling only works if every airline has live visibility of every vehicle
- Telematics-driven maintenance — battery cycle counts, brake events, error codes from vehicle CAN buses, all streamed continuously rather than pulled at end-of-shift
- Compliance reporting — the CAA and the Airport Operators Association will expect verifiable emissions reductions, and the data underneath those reports has to come from somewhere
What the leading UK programmes are showing
Heathrow's Net Zero Plan singles out airside vehicle electrification as one of the larger near-term emissions levers, with the airport supplying the charging infrastructure under its Airside Charging Service. Gatwick has been rolling e-GSE across the South Terminal since 2023 with TaxiBot and electric pushback tractors. Manchester Airports Group's CleanerSky has set 2030 milestones for airside electrification across Manchester, Stansted and East Midlands. Edinburgh has been trialling electric belt loaders and tugs in partnership with its handlers. Bristol has committed to a fully electric airside fleet by 2030 under its CarbonNeutral airport status.
The pattern across all of these is the same: the vehicles are the easy bit, and the wider operations conversation keeps coming back to apron connectivity. The handlers — Menzies, Swissport, dnata UK, WFS, Worldwide Flight Services — have to plug into the same network the airport runs, because no handler is going to install five SIMs in every tug to satisfy five concession airports.
That points clearly to a single managed network owned by the airport, on which the handlers, the airlines, the cargo operators and the airport's own ops team all run. Private 5G fits the shape of that requirement. WiFi and public 4G do not.
The cost model is favourable for airports of every size
The instinct at a regional airport is that this all sounds like Heathrow-scale capex. It isn't. The apron at a 5–10 million passenger airport — Bristol, Liverpool, Newcastle, East Midlands' passenger side, Belfast International — is small enough that a private 5G network covering the whole airfield costs a small fraction of the substation reinforcement that uncoordinated charging would otherwise require. The vehicles are cheaper too, because the regional fleet is smaller and the duty cycles allow a higher proportion of slow charging.
The case at a hub is different in scale but identical in shape. Heathrow's apron is bigger; the substation problem is bigger; the cost of getting it wrong is bigger. The economics still favour a single network across the whole airfield, owned by the airport, with handlers and airlines as tenants on it.
The smaller and regional airports have an advantage the hubs don't: a single decision-maker. There isn't a six-way negotiation with terminal tenants and ground-handling concessions. The airport's ops director and the engineering team can scope, procure and operate the network without an eighteen-month vendor selection process.
What we'd build, and why
A net-zero apron is a connected apron. The wireless layer underneath has to be deterministic, dense enough to handle the vehicle count, secure enough to carry handler and airline data without leakage between tenants, and managed by someone who isn't going to disappear when the warranty expires.
Aerix builds private 5G networks across exactly that kind of operational environment — outdoor, vehicle-dense, weather-exposed, with strict SLAs and zero appetite for downtime. We design the radio plan around the apron's geometry rather than trying to retrofit a terminal WiFi vendor's blueprint to an airside problem. We manage the network so the airport doesn't need a dedicated 5G team. And we price it for the airports actually doing the work — the regional and mid-sized airports that are quietly leading UK aviation's net-zero transition.
If you're costing your e-GSE rollout against your DNO connection and finding the substation upgrade dwarfing the vehicle capex, the answer probably isn't more grid; it's smarter charging on a network that exists. That network is private 5G, and getting it specced into the e-GSE programme from the start is what makes the rest of Jet Zero achievable.