Toyota's engine chief Luca Marmorini is confident the Japanese squad will have their KERS system ready in time for next year.
Marmorini admits, however, that their main priority is to make the system completely safe before they race in on a circuit.
"The 2009 regulations make KERS optional, not compulsory, so it is logical that every team has considered that possibility," said Marmorini.
"However, KERS has the potential to bring an improvement in lap time so we are working at full speed to take advantage of this opportunity.
"Our development is focused on producing a KERS system which is appropriate for Formula One and brings performance increase. We have a group dedicated to this and we trust them to deliver."
Marmorini's comments come after Toyota team president John Howett said he had doubts KERS can be made ready in time for next season.
The early development of KERS has made the headlines for the troubles suffered by Red Bull, who had a scare with a battery in their factory, and by BMW Sauber, who had one of their mechanics electrocuted when he touched a car during testing.
Marmorini made it clear that Toyota's priority is to make the system safe.
"Hybrid systems in Toyota road cars are proven to be safe and reliable, that is beyond doubt, so the technology is not a problem," Marmorini added.
"We are in the development stage of KERS in Formula One and we will not use the system in the car until we are sure that the highest safety standards have been met. Safety is the priority for Toyota."
The Italian said 95 percent of the development is done in the dyno and he revealed the team are yet to decide when they will run KERS in their car.
"We have not set a date for this as it will depend on our development progress in the factory. We will run KERS in the car only when the system has met our stringent requirements for performance and safety."