A new ordinance requires owners of St. Louis buildings of at least 50,000 square feet to track their energy use. The practice, called benchmarking, is expected to save local residents and businesses nearly $8 million annually in energy costs by 2025.
It could also address the city's contribution to climate change, removing greenhouse gas pollution that's equal to what 15,000 cars would emit.
"Seventy seven percent of our [carbon] emissions are coming from buildings," said Catherine Werner, the city's sustainability director. "So why not target those buildings to reduce those emissions?"