Changes have been made to the LMP1 rulebook for the 2018 season, in a bid to make the category more attractive to potential manufacturers.
From next year, hybrid and non-hybrid cars will be aligned using the World Endurance Championship's Equivalence of Technology system, which controls the amount of energy each car is allowed to use per lap.
Following Porsche's exit, Toyota remains the only hybrid manufacturer with an LMP1 entry, while Ginetta and SMP/Dallara have each committed to privately-run projects using non-hybrid machinery.
The measure is intended to rein in the different types of power unit, although the hybrids would still hold a slight advantage in terms of fuel consumption.
As a result of the change, the system of scoring LMP1 hybrids and non-hybrids in separate sub-classes will be axed.
Furthermore, the proposed 2020 regulations which called for the introduction of rapid charging plug-in hybrids will be drastically altered.
The rule stating that cars must complete the first kilometre out of the pits on electric power is set to be scrapped.
A statement from the FIA and ACO said that "more details on the technical regulations will be presented over the coming weeks", with cost-cutting believed to be at the heart of the planning.
The WEC hopes that lower costs will result in renewed interest from manufacturers including Peugeot, which was involved in the creation of the 2020 ruleset.
ACO president Pierre Fillon said: “With all these decisions, we are confident of seeing a full and very competitive grid next season."
"We are already discussing with several manufacturers and privateer teams who are investigating very seriously entrance from 2018/2019 season in LMP1, taking into consideration that the LMP2 and GTE grids are already strong with a high level of commitment for the future.”
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