Williams is experimenting with a no-KERS configuration aboard Rubens Barrichello's car this weekend at the Nurburgring.
Before the recent Silverstone race, we reported that Force India was toying with not using the energy recovery technology to see if the differences in weight-ballast and brake-balance had a positive effect.
The Silverstone based team ultimately decided to keep KERS aboard.
It has now emerged that Williams is experimenting with a no-KERS setup on Barrichello's car this weekend, in conjunction with a new diffuser.
Technical director Sam Michael said the decision to leave the system off the Brazilian veteran's car is to "give us more information going forward".
"On Rubens' car we chose not to race with KERS here in order to get some more data for comparison," he added.
Barrichello ultimately qualified 14th behind his teammate Pastor Maldonado.