A Kansas City, Missouri city council committee has endorsed a plan to require owners of buildings over 50,000 square feet to audit their energy consumption each year.
The ordinance requires calculating energy usage and making the data available to the public.
Supporters say that will encourage energy efficiency, but not mandate it.
Still, it would require owners of buildings over 100,000 square feet to start calculating energy usage in 2017 or face fines.
The smaller buildings between 50,000 and 100,000 square feet would have an additional year to comply.