The Navy continues to be active in tuning its policies to more fully account for the operational constraints of fuel dependency and the wins that can be derived from more energy efficient systems and energy conserving behaviors.
From the official "Navy Live" blog:
The key ... is that energy-saving practices must evolve from “Save energy when you can” to “Save energy unless you can’t.” Institutionalizing and codifying energy savings throughout the fleet will enable us to continue meeting our national defense mission and fulfilling combatant commander requirements, while conserving vital energy resources and conserving scarce defense dollars that the Navy can apply to other priorities, such as maintenance and modernization.
Short, sweet, and comprehensively applicable to all manner of lifecycle and strategy considerations. You can read the whole post HERE.