The Gen3 car was developed through a consortium of suppliers. Spark Racing Technology constructed the chassis and supplied the front axles, Williams Advanced Engineering provided the batteries, and Hankook supplied purpose-built all-weather tyres incorporating bio-materials and sustainable rubber. The baseline Gen3 weighs 760 kg without the driver allowance, carries a 47 kWh liquid-cooled battery limited to 38.5 kWh usable capacity in races, and achieves a theoretical top speed of 322 km/h. Its front axle uses a standardised Front Powertrain Kit supplied by Lucid Motors, rated at 350 kW and used exclusively for regenerative braking in standard trim. Combined rear and front regeneration capacity reaches 600 kW, enabling pit-stop flash-charging at rates up to 600 kW — a feature long planned for Formula E but delayed in the Gen3's opening seasons due to persistent battery issues during testing.
For the 2024–25 season the Gen3 Evo introduced a revised front wing, reintroducing an upper element and more enclosed front wheel treatment reminiscent of earlier Formula E generations. The intent was lower aerodynamic drag, improved durability, and altered aesthetics that better differentiated the cars visually. Hankook modified the tyre compound to deliver five to ten percent more mechanical grip following sustained driver feedback across the Gen3's first two seasons.
The most significant powertrain change concerned Attack Mode and qualifying. While peak power remains at 350 kW at the rear axle, the additional 50 kW over standard race mode is now delivered through the Front Powertrain Kit rather than the rear alone, enabling genuine all-wheel drive during qualifying, race starts, and Attack Mode activations. Prior to this change, Attack Mode's power bonus had been frequently limited by insufficient rear traction, reducing its strategic value. The Gen3 Evo is consequently the first Formula E car to race internationally with all-wheel drive as a standard operational mode. The combined modifications were expected to cut lap times by 1.0 to 1.5 seconds compared to the outgoing Gen3 specification.
Customisable headlights and noise generators were investigated as potential manufacturer differentiation tools but were ultimately not implemented for the Evo upgrade.
A modified version of the Gen3 platform called the GENBETA was developed for record attempts. It features enhanced battery output, all-wheel drive, a softer iON Race tyre compound, and 3D-printed front wing endplates, wheel fins, and a wind deflector. The GENBETA set two separate world records. During the 2023 London ePrix weekend, McLaren driver Jake Hughes drove the GENBETA inside London's ExCeL Centre to set a Guinness World Record for indoor speed at 218.71 km/h, surpassing the previous record of 165.20 km/h set by Leh Keen in a Porsche Taycan Turbo S in New Orleans in 2021. In January 2024, Reem Al Aboud drove the GENBETA from 0 to 100 km/h in 2.49 seconds, establishing a new FIA record for single-seater acceleration and bettering the previous benchmark of 2.6 seconds set in a Formula One car.
The Gen3 Evo represents Formula E's consolidation of the spec-car model at a higher performance ceiling, combining increased grip, all-wheel drive deployment, and visual diversity within a standardised platform. Its introduction of effective AWD Attack Mode addressed one of the persistent on-track criticisms of the Gen3 era — that power bonuses were not converting into visible racing action — and set the technical baseline from which Gen4 development would proceed.