[11][12] The Regera was developed and designed to be a more practical, luxurious, grand touring alternative to the rest of Koenigsegg's lightweight sports car lineup: initially the Agera and later the Jesko.

By removing the traditional 7-speed dual-clutch transmission and switching to a single-gear direct-drive system, Koenigsegg mitigated the added weight of the three electric motors and a 4.5 kW·h battery pack installed in the Regera as compared to the previous Agera models.

[16][17] This manufacturing technique allowed Koenigsegg to better tune airflow through the turbochargers and achieve a more complex inner housing shape which was impossible with conventional methods.

The Regera was used by NVIDIA to introduce Project Holodeck, a virtual reality environment capable of importing and manipulating high-detail 3D models.

As the company's 'grand touring' oriented offer in their two-car lineup, the Regera focuses more on interior luxury and daily usability instead of hardcore track performance like the Jesko.

One 160 kW (215 hp; 218 PS) YASA 400 Motor Generator Unit mounted on the crankshaft acts as starter and generator and supplies torque fill; and two 180 kW (241 hp; 244 PS) YASA 750 wheel-shaft mounted electric motors drive each rear wheel and provide torque vectoring and manages traction.

[26] The electric motors are powered by a 4.5 kWh, 800 volt, 75 kg (165 lb) liquid cooled battery pack developed by Rimac Automobili, making it the first 800-volt production car.

[12][13][22][29] Under braking, the kinetic energy recovery system in the Regera can regenerate up to 150 kW of power to recharge the battery during operation.

[12][33] Above 30 mph, the RPM of the crankshaft mounted electric motor and internal combustion engine are proportional to wheel speed through locking of the hydraulic coupling.

[12] However, Christian von Koenigsegg described and demonstrated how the Regera features a steering-wheel-mounted paddle that simulates a traditional downshift by initiating slip of the hydraulic coupling connecting the crankshaft to the output shaft.

Also returning from the Agera models is Koenigsegg's 'Triplex' damper system, which consists of three custom Öhlins shock absorbers on the rear suspension subsystem.

[13][41] The wireless connectivity capabilities of the Regera allow for Koenigsegg to send over-the-air firmware and software updates to each car as necessary.

[42] This allows for the remote modification of parameters such as the power band of the electric motors or throttle response without the need for physical work on the car.

[44] All openings and wing mirrors are fitted with proximity sensors to safeguard against the doors striking nearby objects (curb, low roof, etc.)

[13] The Regera uses a fishtail-style dual exhaust system designed by Akrapovič constructed of titanium, Inconel, and stainless steel.

The record was set in Råda Military Airfield in Lidköping, Sweden with a car driven by factory test driver Sonny Persson.

[55] The record was set at Örebro Airport by Koenigsegg development driver Markus Lundh, who cited improvements in the track surface and the new Michelin Cup 2 R tyres as reasons for the faster run.

Automobile magazine writes that driving the Regera is "a new sensation, perhaps a combination of the feel you get from electric cars like the Model S, which also has no conventional gearbox, and a combustion-engine vehicle with a continuously variable transmission".

[19] Minor criticisms of the driving experience include the electric motor activation delay and the "slight CVT feel" upon sudden acceleration.

[19] The Regera's design has received acclaim from reviewers, with Top Gear remarking "there's real beauty in its long tail and taut curves".

[61] On the inside, Automobile magazine compliments the "well-designed" and "wildly special" interior of the car, but remarks that it may be topped by the opulence of the Bugatti Chiron, a direct competitor to the Regera.