Republican Gov. Sam Brownback and groups on both sides are preparing to announce a new proposal for rewriting a renewable energy mandate for the state’s utilities.

Brownback was having a news conference Monday afternoon to outline the measure. Representatives of the wind energy industry and groups opposed to the mandate planned to participate.

A 2010 law requires renewable sources, such as wind, to account for 20 percent of a utility’s capacity for generating electricity by 2020.

Supporters say it has helped develop a flourishing wind energy industry in Kansas.

But the Kansas Chamber of Commerce and the free-market group Americans for Prosperity have pushed for the law’s repeal.

The proposal to revise the law comes with lawmakers considering a proposal to impose a new tax on renewable energy.