What ERS is and why it matters
ERS stands for Energy Recovery System. It is the hybrid component of a Formula 1 power unit that captures energy that would otherwise be wasted and converts it into additional power for the driver to deploy during a lap. Without ERS, a modern F1 car would be significantly slower. With it, the power unit becomes a complex energy management challenge as much as a mechanical one.
The current ERS has two main components: the MGU-K and the MGU-H. In 2026, this changes dramatically.
The MGU-K: kinetic energy recovery
The MGU-K (Motor Generator Unit - Kinetic) recovers energy under braking. When the driver brakes, the kinetic energy that would normally be lost as heat is captured by the MGU-K and stored in the battery. The driver can then deploy that stored energy as additional power during acceleration.
In the current regulations, the MGU-K can recover up to 2 megajoules per lap and deploy up to 4 megajoules per lap, adding roughly 160 horsepower to the internal combustion engine's output. That is a significant portion of the car's total power.
The MGU-H: heat energy recovery (being removed in 2026)
The MGU-H (Motor Generator Unit - Heat) recovers energy from the turbocharger's exhaust gases. When hot exhaust gases spin the turbo, the MGU-H captures some of that rotational energy and converts it to electricity. It is a clever system, but it is complex, expensive, and difficult for road car manufacturers to translate into consumer technology.
In 2026, the MGU-H is being removed entirely. This is one of the biggest changes to the power unit regulations and it simplifies the system significantly.
The 2026 shift: 50/50 combustion to electric
The 2026 power units will rely much more heavily on electrical power. The internal combustion engine's output drops from around 550-600 kW to approximately 400 kW, but the electrical component doubles from the current level to around 350 kW. The result is a power unit where roughly half the energy comes from combustion and half from electricity.
This is why the 2026 regulations introduce Manual Override — a system that gives drivers direct control over additional electrical deployment when they are within one second of the car ahead. It replaces DRS as the primary overtaking aid and ties energy management directly to race strategy.
Where fans get confused about energy deployment
The most common misunderstanding is that ERS is like a "boost button" that drivers can press whenever they want. It is not. The energy store is limited, and drivers must manage their deployment carefully across an entire lap and an entire race. Deploy too much early in a lap and you will have nothing left for the final sector. Deploy too conservatively and you will lose time everywhere.
Another confusion is about the difference between the MGU-K and the MGU-H. The MGU-K recovers energy from braking (kinetic). The MGU-H recovers energy from exhaust heat (thermal). Both feed into the same energy store, but they operate in completely different ways and have different limitations.
Why ERS shapes modern F1
ERS is the hidden engine of modern F1 performance. A driver who manages their energy well can be faster than a driver with more raw power but poor deployment. A team that models energy usage accurately can make strategy calls that competitors cannot match.
In 2026, with electrical power doubling and the MGU-H removed, ERS becomes even more central to how races are won and lost. The drivers and teams that understand energy management best will have the advantage.