FORT KNOX, Ky. (AP) — Fort Knox is planning a demonstration to show the Army post can run without external power, which was developed as part of its energy security program.

The demonstration Wednesday is being conducted in accordance with a military directive that wants all Army installations able to operate critical missions by providing their own water and energy for a minimum of 14 days.

A release from Fort Knox says the post is able to exceed the 14-day standard by extracting its own natural gas and using it to generate electricity.

The Army post saves about $10 million each year generating its own energy.

The test will be observed by Jack Surash, the deputy assistant to the Secretary of the Army for Energy and Sustainability, and Kentucky congressman Brett Guthrie.