The new MGU-K, which has been postponed many times since the 2017 season, due to the intentions of introducing it at the outset but suffered from enduring durability issues, has finally been approved and all three teams will be able to use this unit at the weekend of the race.
However, Renault F1 boss Cyril Abiteboul says at least one customer team at least expects to use the old version of the unit in Austria.
One of the problems is that under the 2018 rules, drivers can only use two MGU-K units at the beginning of the season and be punished if they exceed this limit.
McLaren and Red Bull can then switch to the new version after the new version is used by the factory team on weekend conditions and proved to work properly.
"There are parts for all the cars that want to go, but not all teams have to go to the new version," Abitesboul told.
"This is one of the things we've been waiting for so long, but teams can choose not to use it, which means they will compete with the old unit.
"But this is our philosophy, we respect the choice of teams and we accept it." said.
The change came just after Carlos Sainz had lived with the old version MGU-K unit on the last rounds of the French Grand Prix.
"We knew it was a sensitive piece and we deliberately decided to extend it because we knew we would move to a new version unit that would perform better, have better packaging, and provide more durability."
"We were going to go on the track next weekend. Still, this is not too bad, because it shows that we are pushing the borders and accepting the risk. "