Engine maker Cummins Inc. is finding that going green can be profitable, according to an Associated Press report.

Cummins has invested about $10 million in 70 projects in its Indiana facilities since 2007, leading to annual savings of $4 million. Throughout the company, a total investment of about $28 million is providing annual savings of $20 million corporate-wide.

Energy and environmental relations Director Laurie Counsel says few initiatives undertaken by Cummins have produced a better return on investment.

Cummins recently became a partner in the U.S. Department of Energy’s Better Buildings, Better Plants Challenge. That program requires participants to achieve an energy-reduction goal. Cummins is shooting for a 25% reduction by 2015.