Battery-powered aircraft: how close is electric aviation?

There is a scene in Iron Man 2 that, back in 2010, sounded like the perfect throwaway line for a celebrity cameo. Elon Musk meets Tony Stark in Monaco and casually tells him: “I've got an idea for an electric jet.” Stark responds in typical fashion: he likes the idea; they’ll make it work. A few seconds later, the movie moves on. The electric aircraft remains somewhere between the Iron Man suit and the miniature reactor in Stark’s chest.

Sixteen years later, reality is starting to look suspiciously like a sequel to that scene. At sunrise on August 12, 2026, in the small city of Plattsburgh in upstate New York, Heart Aerospace’s X1 rolled onto the runway. The huge experimental aircraft, powered by four electric motors, accelerated, lifted off and carried a fully electric propulsion system producing more than one megawatt into the air for the first time on an aircraft of this scale.

The mission lasted 27 minutes. X1 climbed to roughly 1,100 feet, or 335 meters, and Heart Aerospace described it as the largest battery-electric aircraft ever to fly.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

Hollywood did mislead us in two small ways, though.

First, the person behind this aircraft, Anders Forslund, did not start Heart Aerospace because of a conversation with Musk. Before founding the company, he worked in aviation research and helped launch the Swedish electric aviation initiative ELISE. Heart has never claimed any connection between its project and that Iron Man 2 scene.

Second, this is not actually a jet. Both X1 and Heart’s future passenger aircraft, the ES-30, use propellers.

Reality turned out to be slightly less cinematic — but considerably closer to something you may one day be able to book. And that is where things get interesting. X1’s first flight does not prove that Ryanair will replace its Boeings with battery-powered aircraft next year. It proves something more modest, but arguably much more important: a regional-aircraft-sized machine really can be made to fly on electricity.

The question is no longer just whether the technology can get airborne. It is whether the economics can.

X1 can already fly — but you cannot book a ticket on it

The best way to think about X1 is as an enormous flying laboratory. Heart built it to test the aircraft structure, electric motors, power electronics, flight controls and the entire process of taking an electric aircraft from drawings to real-world flight testing.

The commercial product is supposed to be a different aircraft: the 30-seat ES-30. And the distinction matters. X1 is fully electric. The ES-30 will be hybrid-electric. Its batteries are intended to provide around 200 km — 125 miles — of all-electric range, while the hybrid system should extend total range to roughly 800 km, or 500 miles.

Heart says charging should take around 30 minutes. The company currently targets 2031 for type certification, which means the first commercial flights are much more likely to be an early-2030s story than something you will encounter on your next vacation.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

And 2031 is a target, not a promise. Heart previously aimed for 2028, but the timeline moved after the program was redesigned and the company shifted its main activities to the United States. Forslund now openly says 2031 is the goal. Over the next couple of years, Heart plans to concentrate on its next pre-production prototype and the hybrid propulsion system. That caveat matters because electric aviation has already produced plenty of beautiful presentations with launch dates that later quietly moved to the right.

The difference this time is that a full-scale aircraft has physically left the ground.

But between an experimental flight and a scheduled service carrying 30 passengers, their bags, mandatory energy reserves, while dealing with icing, thunderstorms, system failures and a 365-day timetable lies the least glamorous and most expensive part of aviation: certification. Heart is deliberately trying to make as little of that process revolutionary as possible. Forslund estimates that the future aircraft will face thousands of certification requirements, but only a relatively small proportion of them should involve genuinely novel technologies.

In aviation, that is a compliment. The fewer things you need to invent at the same time, the better your chances of eventually seeing the aircraft at your gate rather than only on YouTube.

The first routes will be very short — and that is the whole point

An electric range of 200 km does not sound particularly impressive. A modern Airbus can fly thousands of kilometers. With the ES-30, it feels as if the cabin crew would barely have time to hand out water before it was time to descend again.

But the ES-30 is not trying to replace an Airbus.

Its niche is the kind of route where a large jet is too expensive, trains are not always available, and several hours by car are inconvenient enough that some passengers would rather fly. A small city to a major hub. An island to the mainland. Two neighboring regions. Two cities separated by mountains or water. Today, the economics of aviation often work poorly on precisely these routes because conventional aircraft are simply too large or too expensive for the amount of demand available.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

Heart describes 125 miles, or about 200 km, as the practical all-electric range of the ES-30. Forslund has stressed that this figure already includes operating reserves and a battery usage strategy designed to avoid pushing the pack to its limits. One example he uses is a route such as Los Angeles to Palm Springs. Longer regional routes — perhaps extending a network toward places such as Santa Barbara or Las Vegas — would use the aircraft’s hybrid system instead.That creates an interesting paradox.

We tend to see limited range as the biggest weakness of an electric aircraft. Heart is effectively turning it into a filter. The company is not trying to electrify London–New York, because with today’s batteries that would make very little sense. Instead, it is targeting the part of the market where 200 km is already useful, while roughly 800 km of hybrid range can cover much of the remaining regional network.

That is how Heart positions the ES-30: as an aircraft for short regional corridors.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

And for travelers, that may be the most important point of all: the first electric revolution in aviation may not be about replacing long-haul flights. It may be about creating routes that do not exist today at all. A new connection between a small airport and a major hub may be more valuable than saving €15 on an existing ticket between two capitals.Forslund’s business case is largely built around bringing commercial aviation back to smaller airports and making low-volume routes economically viable. For now, that remains a manufacturer’s ambition rather than a proven result.

But this is exactly where electric propulsion begins to make the most sense.

Five dollars per flight sounds fantastic. There is just one battery-sized catch

After X1’s first flight, one particularly impressive number spread quickly around the internet: $5. And it is real — with a rather important asterisk. According to Forslund, the entire 27-minute X1 test mission consumed roughly 85 kWh of electricity. At commercial electricity rates in Plattsburgh, that really did cost about five dollars.

The aircraft only spent roughly a third of the total mission in the air, with the remaining time including ground operations such as taxiing, so comparing those $5 directly with the fuel bill for an ordinary passenger flight would be misleading. Still, the number illustrates perfectly why airlines are interested in electricity in the first place.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

Forslund offers a more realistic estimate for the ES-30: at an average electricity price, the energy required for a roughly 200 km flight should cost less than $200 per aircraft. Even if the real-world number ends up higher, that is still a fundamentally different scale of energy expense compared with burning aviation fuel. But this is the point where we need to stop the little low-cost airline executive inside our heads who has already started selling €4.99 tickets.

The airline still needs pilots, cabin crew, airport fees, maintenance, insurance, navigation charges, aircraft financing and ground handling. And in the case of the ES-30, there is another particularly important expense: wear on a very expensive battery. Heart itself is not promising tickets that are 40% cheaper. Its estimate is for more than a 40% reduction in aircraft operating costs compared with alternatives in its model.

Forslund acknowledges that the result is particularly sensitive to three things: the price of jet fuel, the price of electricity and battery life. A 40% reduction in operating costs therefore does not automatically translate into a 40% discount for passengers.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

Some of the savings may become airline margin. Some may be consumed by infrastructure and financing. And some may indeed show up in cheaper tickets — especially on routes where carriers compete aggressively for passengers.

Would cheap nuclear, solar or wind power help?

Yes.

Just not as magically as we might like.

Plattsburgh happened to be an unusually good location for demonstrating this. Forslund attributes the remarkably low $5 electricity bill partly to access to cheap power associated with Hydro-Québec’s hydroelectric generation. He has noted that the same amount of electricity could cost several times more in somewhere like California. That is Heart’s calculation rather than an independent audit of future ES-30 economics, but it illustrates very well how much local electricity markets can matter.

Countries and regions with abundant cheap nuclear, hydro, solar or wind generation could therefore have a genuine advantage — provided that cheap generation actually translates into cheap electricity at the airport.

That last part is crucial.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

An airport does not simply need an attractive average monthly electricity tariff. It may need several megawatts of power precisely when several aircraft arrive at their gates at the same time. If supplying that power requires a new substation, a larger grid connection or stationary battery storage, the price of each solar-generated kilowatt-hour becomes only one part of the equation. Research by the U.S. National Renewable Energy Laboratory has shown that, in some scenarios, even a relatively modest number of electric aircraft could create charging loads greater than an airport’s previous baseline electricity demand.

It is almost the same problem we already see with electric vehicles.

Putting solar panels on a building is great. But if you suddenly want to charge twenty electric trucks in the parking lot at once, the most interesting object in the system is no longer the solar panel. It is the transformer behind the fence.

“I can’t check in a power bank, but the entire aircraft can run on batteries?”

This is probably the most natural question after seeing a large electric aircraft for the first time. First, there is a common misconception worth clearing up: power banks are usually allowed in the cabin.

Under FAA rules, spare lithium batteries and power banks must not be placed in checked baggage. They generally have to remain in carry-on luggage, where overheating or a fire can be noticed and dealt with by the crew.Batteries up to 100 Wh are normally allowed, those between 101 and 160 Wh typically require airline approval, while batteries above 160 Wh are prohibited for ordinary passengers. Individual airlines may impose stricter rules.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

The reason behind all of this is thermal runaway. A damaged lithium cell can overheat, trigger a chain reaction in neighboring cells and release flammable gases. So the obvious question is: what prevents exactly the same thing from happening to a battery thousands of times larger than a power bank?

The answer is not that aviation batteries somehow stopped obeying chemistry.

The risk is still there. The difference is how the entire system is engineered around that risk. A passenger’s power bank is an unknown box of unknown age. It may have fallen down the stairs yesterday or been bought for five dollars from an online marketplace. An aircraft traction battery is part of a certified propulsion system. It can incorporate cell and temperature monitoring, electrical protection, isolation systems, thermal management and defined procedures for dealing with failures.

Current regulatory work on electric aviation treats thermal runaway in propulsion batteries as a serious certification issue. The basic principle is straightforward: manufacturers have to demonstrate that the consequences of a battery fire can either be prevented or contained so that a single failure does not escalate into a catastrophic one. In other words, an electric aircraft will not be considered safe despite carrying an enormous battery. To be certified, it will have to demonstrate that it is safe specifically while carrying that enormous battery.

Heart still has a lot of work ahead here. X1’s first flight demonstrated that a large electric propulsion system can operate in the air. It did not certify the commercial ES-30 as safe for passenger operations.

Will passengers notice any difference in comfort?

Probably a little — but do not expect the sensation of an electric car floating through the clouds.

Heart Aerospace X1 during its first flight in Plattsburgh, New York. Photo: Heart Aerospace

Electric motors eliminate many sources of mechanical noise and vibration associated with combustion engines and turbines. But the ES-30 is still a propeller aircraft. Fast-spinning propellers are not going anywhere, so the idea of an “almost silent airplane” remains closer to marketing language than something passengers can safely be promised today. The more interesting advantage of electric propulsion may ultimately be something we notice not with our ears, but on the timetable. If a cheaper small aircraft makes it viable to fly directly from a nearby regional airport instead of driving several hours to a major hub, that could save a traveler far more time than reducing cabin noise by a few decibels.

The biggest problem may not be the battery. It may be the socket at the gate

Imagine the perfect low-cost airline of the future. The aircraft arrives. One group of passengers gets off while the next is already crowding around the boarding gate. Bags come out, the cabin is cleaned, the pilots go through their paperwork. Thirty minutes later, the aircraft needs to be back in the air.

And then somebody says: “Now we wait for it to charge.”

This is roughly where the low-cost airline CFO wakes up in a cold sweat. The economics of low-cost carriers are built around keeping aircraft in the air as much as possible. Ryanair, for example, describes its standard turnaround as a 25-minute process. In that time, passengers disembark, baggage is unloaded, the cabin is prepared, crews are changed where necessary and the aircraft is made ready for the next departure.

Heart says the ES-30 should charge in about 30 minutes.

Heart Aerospace X1; portraits of Heart Aerospace’s leadership and engineering teams. Photo: Heart Aerospace

At first glance, those two figures look incompatible. But only if charging is treated as a separate operation. The real goal for electric aviation is to connect the aircraft almost immediately after it reaches the stand and charge it in parallel with passenger disembarkation, cleaning, baggage loading and boarding.

In that case, a 30-minute charge does not necessarily add another 30 minutes of downtime. Most of it overlaps with time the aircraft would have spent on the ground anyway. For now, this is an inference from Heart’s stated performance targets rather than proven everyday airline practice. Operators and regulators will still have to determine exactly which ground operations can safely take place at the same time as megawatt-scale charging.

Heart Aerospace X1; portraits of Heart Aerospace’s leadership and engineering teams. Photo: Heart Aerospace

But this may be the line separating a good electric aircraft from a good airline business. If the ES-30 really can recharge in half an hour and charging fits naturally into a normal turnaround, the concept could work even for an airline that uses its fleet intensively If real-world operation requires 30 minutes of ground handling followed by another hour of cooling and charging, much of the economic advantage disappears.

Airports will have to learn how to deliver megawatts

An ordinary EV charger obviously will not be enough.

Heart is targeting megawatt-class charging and is deliberately looking toward technologies and standards similar to those being developed for heavy electric road vehicles. Forslund sees this as an advantage: airports may not need to invent an entirely separate energy ecosystem exclusively for aviation. But physics still applies. One aircraft is one thing. Several ES-30s arriving at the same time are a small industrial load.

Heart Aerospace X1; portraits of Heart Aerospace’s leadership and engineering teams. Photo: Heart Aerospace

Regional airports of the future may therefore need stronger grid connections, transformers and distribution equipment, high-power charging systems on the apron, redundancy and safe-disconnection systems. Where the local grid is weak, stationary batteries may make economic sense. They could charge relatively slowly between traffic peaks and then deliver power rapidly when aircraft arrive.

That makes peak demand, rather than simply the total number of kilowatt-hours consumed over a day, one of the key infrastructure problems. For a large hub, this is primarily an investment question. For a small regional airport, it may be more fundamental:

“We literally do not have that much power available.”

And this is where the hybrid nature of the ES-30 suddenly stops looking like an unfortunate compromise and starts looking like a very sensible insurance policy. Forslund describes a scenario in which the aircraft could arrive at an airport without megawatt charging infrastructure, use conventional aviation fuel through its hybrid system and preserve battery charge. During a longer stop, it could potentially use a lower-powered charger. This becomes particularly important when diverting to an alternate airport. An electric aircraft should not turn into very expensive real estate simply because the correct charger happens to be 200 km away.

The early years of ES-30 operations may therefore look less like an overnight disappearance of jet fuel and more like the gradual creation of electric corridors between prepared airports. Within those corridors, aircraft could operate primarily on battery power. Outside them, the hybrid system would preserve the flexibility airlines expect from conventional aviation.

For low-cost carriers, that may ultimately matter more than range itself.

You can recharge the aircraft in half an hour. The battery will still eventually need replacing

Now for the unpleasant part. Your phone holds less charge after a few years. An electric car gradually loses some battery capacity. An aircraft is not immune to lithium battery ageing either. If anything, aviation is especially demanding.

An airline cannot accept that its aircraft “still sort of flies.” It has to complete a route with the required safety reserves reliably, every day, in winter and summer. Nobody is going to keep operating an aviation battery until it behaves like an old smartphone with half of its original capacity. And this is where some of the magic of the five-dollar flight disappears.

Heart Aerospace X1; portraits of Heart Aerospace’s leadership and engineering teams. Photo: Heart Aerospace

Forslund has said directly that battery depreciation is a larger expense than the electricity used to charge it. In Heart’s current calculations, a battery pack may last several thousand cycles and potentially require replacement roughly every two to three years. Those figures are not final guaranteed specifications for the production ES-30. Heart is still evaluating cells and balancing energy density against battery longevity. The expense is important enough that Heart intends to build a separate business model around it: the company plans to sell the aircraft themselves while leasing their batteries to airlines.

That is a crucial detail whenever we start talking about cheap tickets. The airline of the future will not simply swap “expensive kerosene” for “almost free electricity.” It will effectively exchange part of its continuously burned fuel and turbine maintenance costs for electricity plus the gradual consumption of a very expensive battery. Heart argues that the balance should still be favorable. The company targets more than 40% lower operating costs than conventional regional-aircraft alternatives.

But Forslund openly identifies the three variables on which that calculation depends most heavily: jet-fuel prices, electricity prices and battery cycle life. Change any of those and the beautiful 40% changes too. That is why it would be impossible today to honestly claim that electric aircraft will cut ticket prices in half. We do not yet know the final cost of production battery packs, their lease rates, their true lifespan under everyday airline operations or the amount airports will have to invest in infrastructure. What we can say is something slightly different: cheap electricity alone is not the main economic advantage of an electric aircraft.

What matters is the whole package — less expensive fuel, potentially simpler electric propulsion, lower maintenance needs and the ability to operate a 30-seat aircraft on routes where a conventional regional aircraft is simply too expensive.

That combination is what Heart is betting on.

So will electric aviation actually be cheap?

The most realistic outcome is considerably more interesting than the marketing fantasy of a five-dollar ticket. The ES-30 is unlikely to turn a €100 trip into a €20 trip simply because there happens to be a nuclear power station or a field of solar panels near the airport.

Electricity is only one part of the cost structure, while battery depreciation may cost more than the energy itself.

But cheap and stable electricity really can improve the economics of an individual route — particularly if the airport already has a strong grid connection and does not need to build half of its energy infrastructure from scratch. For passengers, the benefit may appear in different ways. On a popular route, it could mean somewhat cheaper fares if competition forces airlines to pass some of the savings on to customers. On a thin regional route, it could mean something much more interesting: a flight that did not exist before.

Renderings of the ES-30 hybrid regional airliner. Photo: Heart Aerospace

In short: questions and answers

When will electric aircraft start carrying passengers?

Most likely in the early 2030s, initially on short regional routes. That is where limited battery range creates the fewest problems for the economics of the flight.

Will tickets become significantly cheaper?

Not necessarily. Electricity and electric-powertrain maintenance may cost less than jet fuel and conventional engine maintenance, but airlines still have to pay for aircraft, crews, airport fees, insurance, ground handling and infrastructure.

Why not simply use long-lasting LiFePO₄ batteries?

Because weight matters enormously in aviation. LFP batteries typically store less energy per kilogram, and every extra kilogram means less range, fewer passengers or less baggage.

Is it safe to fly with an enormous battery on board?

That is one of the central challenges of certification. Aviation battery systems require monitoring, cooling, electrical isolation and protection against thermal runaway. A huge battery is not automatically safe — manufacturers have to demonstrate that the aircraft remains safe despite the risks it introduces.

Can airports charge these aircraft quickly enough?

Technically, yes. But they may need megawatt-scale grid connections, powerful chargers, new transformers and, in some cases, stationary energy storage.

Won’t charging destroy the fast turnaround model used by low-cost airlines?

It could, if aircraft have to sit at the gate solely to charge. The idea only becomes attractive if charging can happen simultaneously with cleaning, baggage handling and passenger boarding.

What happens as the batteries age?

Their usable capacity gradually declines. Because aviation requires substantial safety reserves, a battery may become unsuitable for aircraft operation long before it is completely worn out. Battery replacement or leasing will therefore become an important part of operating costs.

Will electric aircraft completely replace conventional ones?

Not in the foreseeable future. A more realistic picture is fully electric aircraft on short routes, hybrid aircraft on longer regional sectors and conventional aviation where batteries remain too heavy.

So what did the first Heart X1 flight actually prove?

That a large fully electric aircraft can fly. The question is gradually shifting from “Can we build one?” to “Can we make it cheap, practical and reliable enough to operate every day with paying passengers?”

Sources: Heart Aerospace X1, Heart Aerospace ES-30, Impacts of Regional Air Mobility and Electrified Aircraft on Local Grid Infrastructure and Airport Electricity Demand

Photo: https://www.heartaerospace.com/media-bank