The company didn't disclose how much power it plans to purchase or the related cost savings it anticipates. : The company didn't disclose how much power it plans to purchase or the related cost savings it anticipates. Defense contractor General Dynamics said Monday that it has entered into an agreement with Longroad Energy to purchase power for its Bath Iron Works shipyard from six pending solar projects in Maine. The company said BIW is the first major industrial user in Maine to enter into such a relationship, known as net-energy billing.