FREDERICK - UQM Technologies Inc. (AMEX: UQM) will be added to the Nasdaq Clean Edge Green Energy Index effective at the opening bell on March 22.

The index tracks the performance of publicly traded clean energy companies, including those engaged in the manufacture, development, distribution and installation of emerging clean energy technologies such as solar photovoltaics, biofuels and advanced batteries.

Frederick-based UQM develops and manufactures power-dense, high-efficiency electric motors, generators and power electronic controllers for the automotive, aerospace, military and industrial markets.

In January, UQM received a $45.1 million grant from the U.S. Department of Energy. The grant was part of the American Recovery and Reinvestment Act to help companies involved in the manufacture of electric vehicles, batteries and components buy new facilities and equipment.

In afternoon trading, UQM shares were down slightly at $4.30.