The key numbers behind the two-step revision to the power unit regulations
Following longs weeks of intensive talks, Formula 1 has finalised a significant revision to its upcoming power‑unit framework, agreeing to introduce the 60/40 split between Internal Combustion Engine output and electrical power through a staggered, two‑season transition in 2027 and 2028.
The decision follows extensive discussions between Formula 1, the FIA, the teams, all current power‑unit manufacturers and future entrant General Motors, after the sport announced last month that a move from the current 53/47 balance to 60/40 had been agreed in principle.
Several manufacturers, however, expressed resistance to implementing such a substantial shift as early as 2027, prompting the governing body to adopt a phased approach.
In 2027, the maximum ICE output will rise from 400 kW to 420 kW, enabled by a 5% increase in fuel flow, while MGU‑K power will be reduced from 350 kW to 300 kW. This creates an interim 58:42 split between combustion and electrical power. Maximum energy harvesting will increase from 350 kW to 375 kW, and the 350 kW overtake mode will remain unchanged.
The following year, in 2028, ICE power will increase further to 450 kW, supported by a 13% fuel‑flow increase relative to the 2026 baseline, while MGU‑K output remains capped at 300 kW.
Maximum harvesting will rise again to 400 kW, completing the transition to the targeted 60/40 power distribution. The staggered rollout also gives teams additional time to design chassis capable of accommodating the 13% increase in fuel capacity required for 2028.
In its statement, the FIA explained that “the proposed changes are intended to address issues related to energy management and fuel energy flow characteristics and make qualifying more flat out, while not impacting the positive and exciting racing generated by the new regulations.”
The governing body emphasised that the revised framework “introduces a staged rebalancing of Internal Combustion Engine and Energy Recovery System contribution across the 2027 and 2028 seasons,” and that it “includes targeted adjustments to internal combustion engine output, fuel energy flow and energy recovery system deployment, together with increased flexibility in energy management.”
The FIA added that “supporting measures relating to power unit supply conditions, race operations and the relevant financial regulations are also included.”
The federation underlined that the amendments were developed collaboratively, noting that “the 2026 Formula 1 regulations were developed and agreed in close partnership between the FIA, FOM, teams, OEMs and Power Unit Manufacturers,” and that “these latest amendments reflect the continuation of this collaboration with all stakeholders working collectively to refine the framework and address identified operational challenges.”
To ensure teams and manufacturers can prepare adequately, the FIA confirmed that “the FIA will now expedite the formal approval process to provide all parties with early clarity and sufficient time to adapt to the revised requirements.”
