The commission also put the company on notice that the county "no longer contemplates owning and operating the waste-to-energy facility" as planned at the county landfill in the Boise foothills.
The three-member commission unanimously voted to give Dynamis 90 days to pay back $2 million the county gave the company to design the trash-burning, electricity-producing facility.
The 2010 contract signed with Dynamis calls for the money to be repaid when the the facility design plan is complete -- and commissioners say that clause is now in effect.
"In our minds, we've stood with them for two and a half years," said commission chairman Rick Yzaguirre. "And it's time for them to step up and pay us back and move forward with the process, or not."
The Boise-based nonprofit group "Safe Idaho Citizens" that's suing the county over what it calls an illegal loan says the vote changes nothing.
"There are a lot of issues in this lawsuit," said a group spokesperson, Kristin Stilton.
Our calls to Dynamis for comment have not yet been returned.
The Dynamis project cannot move forward without a permit from the Idaho Department of Environmental Quality. That's under review, and it's unclear when -- or if -- the permit will be approved.