The 2026 F1 power unit splits output roughly 50/50 between ICE and electric. The MGU-K triples in power, the MGU-H is gone, and sustainable fuel is mandatory. Here is what changed and why it matters for the racing.
The 2026 Formula 1 power unit regulations represent the most significant change to how these cars produce power since the turbo-hybrid era began in 2014. The total output remains in the region of 1,000 horsepower, but the way that power is generated has been fundamentally rebalanced. The electric motor is no longer a supplementary system -- it is now an equal partner to the internal combustion engine. Here is how the new formula works, what was removed, who the new players are, and what it all means when you watch a race on Sunday.
The Headline Numbers
Under the previous regulations, the internal combustion engine (ICE) produced roughly 70% of the total power, with the electrical systems contributing the remaining 30%. The 2026 formula inverts that balance toward a near-equal split. The ICE still produces around 400 kW (approximately 536 horsepower), but the MGU-K -- the Motor Generator Unit-Kinetic, which converts braking energy into electrical power and vice versa -- now delivers approximately 350 kW (around 470 horsepower). That is nearly triple its previous output of roughly 120 kW.
Combined, these two sources produce over 1,000 horsepower. But the engineering philosophy behind that number has changed entirely. In the previous era, the ICE was the dominant force and the electrical systems existed to augment it. Now, the electric motor is a serious, primary power source that generates close to half the total output. That changes everything -- from how teams design the car's energy systems to how drivers manage their power through a race.
The ICE: Same Architecture, Different Role
The internal combustion engine remains a 1.6-litre V6 turbocharged unit running at 15,000 rpm. The fundamental architecture is unchanged from the formula introduced in 2014. But its role within the overall power unit has been deliberately reduced.
The FIA's reasoning is straightforward. The ICE has been the most expensive and complex component to develop, and the performance gaps between manufacturers were widest in this area. By capping the ICE's contribution at roughly 50% of total power, the regulations narrow the window within which manufacturers can gain an advantage through combustion engine development alone. This was a deliberate choice to reduce costs and compress the competitive spread.
There is another factor: fuel. The 2026 power units must run on 100% sustainable fuel -- a synthetic or bio-derived fuel that is certified as net-zero carbon. This is not a minor tweak. The combustion characteristics of sustainable fuels differ from the petroleum-derived fuels used previously. Energy density is lower, which means the engine must extract more from less. Teams have been developing their ICE architecture around these new fuel properties for years, and the efficiency gains required are substantial.
The fuel flow rate has also been reduced from 100 kg/h to 70 kg/h. Less fuel per unit of time means the ICE produces less peak power -- but it also means each car carries less fuel at the start of a race, contributing to the overall weight reduction that was a central goal of the 2026 regulations.
The MGU-K: From Supporting Act to Lead
The story of the 2026 power unit is really the story of the MGU-K. In the previous formula, this motor generator unit was capped at approximately 120 kW of deployment power. It harvested kinetic energy during braking and released it as electrical power to supplement the ICE, primarily during acceleration out of corners and on straights.
At 120 kW, the MGU-K was a useful tool but not a defining one. Drivers would feel a boost when the electrical energy deployed, but the ICE was doing the heavy lifting. The system was sophisticated but constrained.
The 2026 MGU-K delivers roughly 350 kW -- nearly three times the previous limit. At this power level, the electric motor is no longer supplementary. It is a primary propulsion source. When a driver accelerates out of a slow corner, a substantial portion of the force pushing the car forward comes from the electric motor. On fast straights, the interplay between ICE power and electrical deployment determines top speed and acceleration rate.
The energy storage system (the battery) has been redesigned to handle this increased power flow. It must charge faster during braking and discharge faster during deployment. The thermal management of the battery -- keeping it within its optimal operating window -- has become one of the most critical engineering challenges. A team that solves battery thermal management better than its rivals gains a performance advantage that compounds over an entire race distance.
The MGU-H: Gone
The most talked-about deletion in the 2026 regulations is the MGU-H, the Motor Generator Unit-Heat. This device sat on the turbocharger shaft and performed two functions: it harvested energy from exhaust gases (converting waste heat into electrical energy), and it could spin up the turbocharger to eliminate turbo lag.
The MGU-H was an engineering marvel. It was also fiendishly complex and expensive to develop, and it created an almost insurmountable barrier for new manufacturers considering entry into F1. Honda struggled with it for years when they returned to the sport in 2015. The technology had no relevance to road cars, which undermined F1's stated purpose of being a proving ground for automotive innovation.
Its removal accomplishes several things simultaneously. It simplifies the power unit architecture, reducing the number of components that can fail and lowering development costs. It removes the single biggest deterrent for potential new manufacturers. And it brings turbo lag back into the equation -- a subtle but meaningful change for how drivers experience the car.
Without the MGU-H to instantly spool the turbocharger, drivers will feel a fractional delay between pressing the throttle and receiving full boost. This is a small thing in absolute terms -- we are talking about tenths of a second -- but it changes the character of the power delivery. Drivers must anticipate the boost curve rather than relying on the seamless response that the MGU-H provided. It rewards throttle sensitivity and racecraft, particularly in slow corners where managing the power delivery smoothly is critical.
New Manufacturers, New Competition
The simplified power unit architecture was designed, in part, to attract new manufacturers. It has succeeded. Two significant entrants have joined the grid under the 2026 regulations.
Audi has completed its takeover of the Sauber team and is now competing as a full works manufacturer. The Hinwil-based operation builds its own power unit, making Audi the first new engine manufacturer to enter F1 since Honda returned in 2015. The project has been years in development, with Audi leveraging its extensive experience in hybrid powertrains from Le Mans and Formula E. Their first season has been about learning -- Nico Hulkenberg has been extracting respectable results -- but the long-term ambition is clear: Audi wants to compete for championships.
Honda has returned as a works power unit supplier to Aston Martin, ending a brief period where they had technically exited the sport (their partnership with Red Bull had been rebranded as Red Bull Powertrains). The new arrangement sees Honda providing a bespoke power unit to Aston Martin as a factory partnership, while Red Bull continues with their own RBPT-developed unit that shares some Honda DNA. Honda's return was heavily influenced by the removal of the MGU-H and the increased emphasis on electrical systems -- areas where Honda sees direct alignment with its road car electrification strategy.
These new entries matter for competition. More manufacturer involvement typically leads to faster development cycles, closer performance between power units, and a healthier technical ecosystem. The previous era saw Mercedes dominate the power unit war for years; the 2026 formula is designed to prevent that kind of sustained single-manufacturer advantage.
Energy Management: The New Tactical Battleground
For fans watching on Sunday, the most visible consequence of the 50/50 power split is the emergence of energy management as a primary strategic variable.
In the previous era, energy deployment was largely invisible to viewers. The systems were sophisticated but operated within narrow performance windows, and the differences between teams were subtle. Under the 2026 regulations, the vastly more powerful electrical system creates meaningful tactical decisions throughout a race.
Here is the core tension: the MGU-K can deliver 350 kW, but the energy to power it must come from somewhere. It is harvested primarily during braking -- the harder and longer a driver brakes, the more energy is recovered. But there is a finite amount of energy available in the battery at any given moment, and deploying it aggressively on one straight means having less available on the next.
This creates a push-and-pull dynamic that plays out over every lap. A driver defending a position might deploy maximum electrical power on the main straight to maintain speed, but then have reduced power available through the next sector. The attacking driver, knowing this, might hold back their deployment, accept a smaller gap on the straight, and then use their stored energy advantage to attack in a section where the defending driver is energy-depleted.
Team radio calls referencing "energy delta" and "deployment modes" will become increasingly common. These are not abstract engineering terms -- they reflect real, race-deciding tactical choices happening in real time. A driver asked to "save energy" for three corners is being set up for an attack or a defense that will happen 30 seconds later. Understanding this dynamic adds a layer to race watching that rewards attention.
Sustainable Fuel: The Quiet Revolution
The mandate for 100% sustainable fuel is, in engineering terms, the most challenging single element of the 2026 regulations. It receives less attention than the MGU-K upgrade or the MGU-H deletion, but its impact on engine performance is profound.
The fuels being used are either synthetic (produced using captured carbon dioxide and renewable energy) or bio-derived (produced from sustainable biomass). Both must meet the FIA's stringent sustainability certification. The net-zero carbon mandate means that the carbon dioxide released during combustion is offset by the carbon dioxide captured during fuel production.
From a performance perspective, these fuels have different combustion characteristics than the petroleum-based fuels they replace. Teams and manufacturers have spent years optimizing combustion chamber geometry, injection timing, and ignition strategies to extract maximum performance from these new fuel formulations. The details are closely guarded -- fuel development is one of the few areas where significant performance gains remain available.
For the sport's broader positioning, the sustainable fuel mandate is arguably the most consequential change. It signals that F1 is serious about environmental responsibility without abandoning the internal combustion engine entirely. The technology developed for F1 sustainable fuels has a direct pathway to road car applications, which is precisely the kind of technology transfer that justifies the sport's existence in the eyes of manufacturers and regulators.
What to Listen For
When you watch a 2026 race, pay attention to these moments. During overtaking attempts on long straights, the speed differential between two cars is often a function of who has more electrical energy available, not just who has a better engine. When a commentator mentions a driver is in "harvest mode" through a particular section, that driver is deliberately braking earlier or coasting slightly to recharge the battery for an attack later in the lap. When a driver suddenly closes a gap that has been stable for several laps, it often means they have switched to a more aggressive deployment strategy -- spending energy they had been saving.
The 50/50 power split has made the invisible visible. The tactical chess match between energy harvesting and deployment is now significant enough to decide race outcomes. It rewards the most intelligent teams and the most disciplined drivers, and it punishes those who spend their energy budget too early.
The 2026 power unit formula is not just a technical regulation change. It is a philosophical shift in what an F1 car is. For the first time, these are genuinely hybrid machines in the truest sense -- two equal power sources, working in concert, managed in real time. The engineering challenge is immense. The racing it produces is richer for it.
