General Dynamics NASSCO unveiled one of the largest controlled exterior lighting systems for a manufacturing site on May 29 at its Barrio Logan shipyard.

The system will only turn on lights as needed in the 86-acre NASSCO shipyard, which operates 24 hours a day. Lights will only go on in areas occupied by people.

The General Dynamics (NYSE: GD) unit said it expected to save 1.3 million kilowatt hours annually with the system.

Company officials said the new system is as an example of the business’ environmental stewardship and its willingness to be a good neighbor with the residents of Barrio Logan.

Mayor Kevin Faulconer was among the dignitaries at the ribbon-cutting ceremony.

The Virticus system was manufactured by LSI Controls with collaboration by Rexel, Omega Industrial and On-Site Energy. NASSCO said it anticipates that San Diego Gas & Electric Co. will provide the shipbuilder with a substantial rebate for future energy savings as a result of the system.