Testing of the first electric car for the new Projekt E series will begin next month, ahead of its debut on the 2020 World Rallycross package.
The World Motor Sport Council has already confirmed its intention for electric cars to be incorporated into WRX's main category in 2021.
Series promoter IMG has stated that Projekt E will begin next year, branding the concept as an "electric development series".
Running at selected European rounds of the calendar in 2020, IMG states the "underlying aim of Projekt E is to evaluate electric racecars in a WRX environment".
It adds that the move is "in accordance with the roadmap for electrification of the FIA World Rallycross Championship, which was recently ratified by the FIA World Motorsport Council".
Manfred Stohl's STARD firm revealed in May that it will develop and produce the electric powertrain kits for the conversion of steel-bodied Supercars to Projekt E specification.
The first car, which will use the firm's 'REVelution' powertrain system, will be based on the Austrian outfit's WRX Ford Fiesta Supercar.
The Projekt E car is set to be officially unveiled in September.
"We have been working with STARD on the future electrification of world rallycross for several months," said WRX managing director, Torben Olsen.
"You will see from the technical details of the Projekt E racecars that the innovative demonstration series will be an exciting addition to our WRX race weekend at selected events next year.
"We have now reached an important stage in the ongoing development of electric solutions for rallycross and, in particular, Projekt E.
"Our technical collaboration with STARD on Projekt E is further proof of our commitment to future mobility and relevant technologies in rallycross."