The FIA World Motor Sport Council ratified a revised power unit framework that will move the championship away from the near 50:50 balance between internal combustion and electrical power introduced this year.
From 2027, F1 will adopt a 58:42 split in favour of the internal combustion engine, before moving to a 60:40 split from 2028.
The changes follow concerns raised during the first season of the 2026 regulations, with drivers and teams facing increased energy management demands across a lap.
Under the 2027 changes, internal combustion output will rise by around 20kW, while the maximum capability from the energy recovery system will be reduced by 50kW.
Maximum harvesting capacity will also increase by 25kW per lap, a move aimed at reducing the loss of electrical deployment at higher speeds.
The fuel flow rate will increase by five per cent to help offset the additional combustion power, with further measures also approved around reconnaissance laps and race distances at selected circuits.
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Those could include limiting pre-race reconnaissance laps at venues such as Monza, while race distances may be cut by one or two laps where required.
For 2028, the FIA has approved a further move towards the 60:40 split, with fuel flow increasing by 13 per cent overall and internal combustion output rising to 450kW.
The council also approved the first issue of the 2027 technical regulations, including “structural, wording, and targeted technical updates that improve clarity, consistency, and enforceability while incorporating key learnings from the 2026 season.”
Pre-season testing for 2027 has also been increased from three days to four, with the FIA citing the complexity of the current generation of cars.
“The FIA continues to oversee the evolution of the 2026 Regulations and work closely with all key stakeholders across the motorsport community,” FIA president Mohammed Ben Sulayem said.
“As with every major regulatory change, the process does not end when the cars first take to the track.
“Continuous dialogue and collaboration are essential to ensuring that the regulations meet the needs of the sport, its drivers, and its fans.
“Together we are exploring the future direction of the championship and considering how the sport can balance innovation, sustainability, performance and fan appeal in the years ahead.
“The discussions around future power unit concepts, including V8 engines powered by sustainable fuels, demonstrate the willingness of all parties to engage in shaping the next chapter of the sport.”
The FIA also confirmed two safety-related changes to the 2026 regulations.
Boost Mode will be partially reintroduced in wet or low-grip conditions, but only to prevent power reduction rather than increase output.
The overtake function will be disabled in those conditions, with the tweak designed to reduce closing speeds when visibility is poor.
The heat hazard procedure has also been revised, allowing the FIA to apply it separately to a sprint, a grand prix, or both.
A heat hazard will still be declared 24 hours before the start of the competition, with drivers required to use cooling equipment or carry additional ballast when it is activated.
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