Clean Energy Fuels Corp. has finished construction of 14 clean natural gas fueling stations for refuse fleet customers this year and expects to construct another 22 by the end of 2015.

The new stations arrive at a time when over 60 percent of new refuse trucks sold in the U.S. are powered by natural gas with some companies reaching 90 percent, according to the company.

“It has become almost a requirement for refuse companies to convert at least part of their fleets to natural gas in order to stay economically and environmentally competitive,” said Raymond Burke, vice president for business development in the solid waste industry.

The stations will support the country’s largest waste companies such as Waste Management, Republic Services and Progressive Waste Solutions, as well as regional companies such as Knight Waste and municipalities such as the City of Medicine Hat in Alberta, Canada, according to the company.