Heart Aerospace's ES-30 and the engineering pivot that could make regional electric flight real

Heart Aerospace scrapped its all-electric 19-seat ES-19 in 2022 and replaced it with the ES-30, a 30-seat hybrid-electric regional aircraft that may be the most pragmatic path to commercial electric flight. By pairing battery-electric propulsion for short routes with turbogenerator range extenders for longer ones, the Swedish company designed around the physics of today’s batteries rather than hoping the physics would catch up.

Why Did Heart Aerospace Abandon the ES-19?

Heart Aerospace was founded in 2018 in Gothenburg, Sweden, by Anders Forslund. The original ES-19 concept was a fully electric, 19-passenger aircraft designed for routes of about 200 nautical miles. United Airlines deposited for 100 units. Mesa Air Group signed up for another 100. The interest was real.

The problem was energy density. Lithium-ion battery packs deliver roughly 250–300 watt-hours per kilogram. Jet fuel delivers about 12,000 watt-hours per kilogram — a factor-of-40 difference. Electric motors are significantly more efficient than turbines at converting stored energy to thrust, which claws back some of that gap. But not nearly enough for a 19-seat airplane to fly useful distances on batteries alone.

In the summer of 2022, Forslund killed the ES-19 and announced the ES-30 — not just a larger airplane, but a fundamentally different architecture.

How Does the ES-30’s Hybrid-Electric Powertrain Work?

The ES-30 uses two electric motors driving propellers, one per wing, fed by a battery pack that powers takeoff, climb, and short-range cruise. For routes under 108 nautical miles (200 km), the aircraft flies on battery power alone — 30 passengers, zero direct emissions.

For longer routes up to 216 nautical miles (400 km), two small turbogenerators in the rear fuselage activate. These compact gas turbines spin generators to produce electricity. They don’t drive the propellers directly. They charge the batteries and supplement the electric motors during cruise. The propellers are always driven electrically; the turbogenerators function purely as range extenders.

The analogy is a plug-in hybrid car: battery power for short trips, a combustion engine for longer ones. Same principle, dramatically more complex execution at aircraft scale.

What Problems Does This Architecture Solve?

Range. A pure-battery 30-seat aircraft cannot fly far enough for most commercial regional routes with current technology. The turbogenerators extend useful range to 400 km, covering an enormous number of regional city pairs.

Certification. The ES-30 is being designed to EASA CS-25 standards — the same transport category certification as an ATR 72 or Dash 8. No special category, no light sport workaround. This means the aircraft can slot into existing airline operations without new pilot types, maintenance categories, or regulatory frameworks.

Economics. Heart claims the ES-30 will reduce direct operating costs by roughly 30% on battery-only routes and about 15% on hybrid routes compared to conventional turboprops of similar size. The savings come from lower energy costs (electricity vs. jet fuel), fewer moving parts in the electric drivetrain, and reduced motor maintenance.

What Are the Key Engineering Challenges?

Battery weight. The battery pack represents a significant fraction of maximum takeoff weight. Any shortfall in energy density directly reduces range or payload. Heart uses a distributed battery architecture with multiple independent packs, each with its own thermal management, fire containment, and power management. If one pack fails, it can be isolated without affecting the others.

Fast charging generates enormous heat in a weight-constrained airframe. The thermal management system must handle both normal discharge heat in flight and rapid charging heat during ground turnarounds.

The turbogenerators are derived from proven gas turbine technology rather than cutting-edge experimental designs. Heart prioritized reliability and certifiability over peak efficiency — using mature combustion technology as the range extender while pushing boundaries on the electric side.

Power management is handled by a sophisticated computer system that balances battery discharge, turbogenerator output, motor speed, and propeller pitch across all flight phases. Pilots command thrust; the system determines the optimal power source. Under the surface, the control laws manage a multi-source power system that must remain stable and predictable.

What About Charging Infrastructure?

For all-electric short routes, the ES-30 needs megawatt-class chargers capable of turning an aircraft around in 30 minutes. That infrastructure does not exist at most regional airports today. Heart has been working with airport partners and energy companies, but the chicken-and-egg problem persists: airlines won’t commit to electric routes without chargers, and no one installs chargers without airline commitments.

Who Has Ordered the ES-30?

Airline interest is substantial and comes from operators flying exactly the routes the ES-30 targets:

• United Airlines and Mesa Air Group remain in the picture from the ES-19 era
• Air Canada signed a letter of intent
• Braathens Regional Airlines, a Scandinavian operator, has committed to the type — their short hops across Sweden and Norway closely match the aircraft’s battery-only range

Sweden is a natural testbed. The country aims to make all domestic flights fossil-free by 2030 and has been investing in electric aviation infrastructure. Key domestic routes align well: Stockholm to Gothenburg is about 220 nautical miles, Gothenburg to Malmö about 140 — both within ES-30 range.

How Does Heart Compare to Other Electric Aviation Companies?

Eviation’s Alice is a nine-passenger all-electric commuter in flight testing, targeting air taxi and cargo rather than scheduled airline service — a smaller, shorter-range market segment.

Several companies are pursuing hydrogen fuel cell propulsion for regional aircraft, representing an alternative technology path.

Airbus and Boeing both have hybrid-electric and hydrogen research programs for future narrowbodies, but those target 2035–2040 timelines at the earliest. The regional segment is where electrification makes sense first: shorter distances, smaller aircraft, and a more manageable certification path.

Heart’s positioning — 30 seats, hybrid architecture, CS-25 certification — targets the sweet spot where current battery technology can actually work.

When Will the ES-30 Enter Service?

Heart originally targeted around 2028. Realistically, given CS-25 certification complexity, supply chain challenges, and typical flight test programs, 2029–2031 is more likely.

EASA certification of a hybrid-electric transport aircraft involves failure modes never previously analyzed: battery thermal runaway in a transport category aircraft, turbogenerator failure during electric cruise, and power management system certification. The test matrix is enormous.

How Will Electric Flight Actually Scale?

The transition to electric aviation won’t begin with electric narrowbodies. It starts with 30-seat turboprops being replaced on short regional routes — in Scandinavia, the Pacific Islands, and other places where routes are short and environmental pressure is highest. Better batteries then enable longer range, larger aircraft follow, and incremental improvement over two decades eventually reaches narrowbody scale.

Heart Aerospace’s pivot from the ES-19 to the ES-30 represents something rare among aviation startups: acknowledging that the original plan wouldn’t work and redesigning around physical reality rather than investor expectations. The hybrid architecture is pragmatic, the certification path is ambitious but sound, and the airline interest is genuine. The risks — battery performance, charging infrastructure, certification timeline — are real but bounded.

Key Takeaways

• Heart Aerospace scrapped its all-electric ES-19 in 2022 and pivoted to the ES-30, a 30-seat hybrid-electric regional aircraft with turbogenerator range extenders
• Battery-only range covers routes under 200 km; hybrid mode extends range to 400 km, serving a large number of regional city pairs
• CS-25 certification means the ES-30 can integrate into existing airline operations without new pilot types or regulatory frameworks
• Realistic entry into service is 2029–2031, later than official targets but achievable given the engineering maturity of the approach
• The aircraft targets 15–30% operating cost reductions over conventional turboprops, driven by lower energy costs and reduced maintenance