The company - which is based in Branston, Lincolnshire, and announced the 2,500sq m development last month - won the standard for cutting carbon emissions over the past three years.
Managing director Graeme Beattie said the firm had ISO 14001 accreditation, an environmental-management system and eco-sensitive kit and processes.
The company also uses hyper-efficient cold stores, high-speed doors to cut heat loss and upgraded water-treatment facilities.
The new plant is due to open next spring and involve 40 new jobs. Some £500,000 worth of advanced production gear would satisfy rising demands of retail customers.
Branston, awarded the role of category leader of prepared products to Tesco this September, currently handles potato croquettes, slices and wedges in Holbeach.