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GAO-21-79R 1 (2020-11-05)

handle is hein.gao/gaobaebxy0001 and id is 1 raw text is: G A O U.S. GOVERNMENT ACCOUNTABILITY OFFICE 441 G St. N.W. Washington, DC 20548 November 5, 2020 The Honorable James Inhofe Chairman The Honorable Jack Reed Ranking Member Committee on Armed Services United States Senate The Honorable Adam Smith Chairman The Honorable Mac Thornberry Ranking Member Committee on Armed Services House of Representatives Arleigh Burke Class Destroyers: Observations on the Navy's Hybrid Electric Drive Program In 2009, the Secretary of the Navy established goals that, in part, focused on reducing the energy consumption of the Navy's forces. Two years later, the Navy initiated a program to develop and install Hybrid Electric Drive (HED) systems on its fleet of Arleigh Burke class (DDG 51 Flight IIA) destroyers. The Navy's HED system is designed to save fuel by using excess power from the ship's electrical system to propel the ship. Since 2011, Navy officials told us that they have spent over $100 million on the development, purchase, and upgrade of six HED systems.1 However, the Navy has only installed one of these systems to date. In October 2018, the Navy completed installation of one of the systems on the DDG 103 (USS Truxtun). The other five systems that the Navy purchased are in storage. The Navy has not purchased the remaining 28 of the 34 original notionally-planned systems. In July 2020, the Navy stated that, instead of installing the remaining five systems on ships, it would use them for a research effort referred to as Propulsion Derived Ship Service (PDSS). The Navy's goal for PDSS is to develop an electric motor that can facilitate the movement of power to and from a ship's electrical and propulsion systems, according to senior Navy officials. In contrast, the HED can only move power in one direction-from the electrical system to the propulsion system. Senate Report 115-262 accompanying the National Defense Authorization Act for Fiscal Year 2019 asked the Navy to submit a report on the HED system installed on the USS Truxtun and 1 A Navy official told us that they reprogrammed approximately $30 million of these funds for other purposes and cannot effectively spend an additional $32.5 million. GAO-21-79R Navy Hybrid Electric Drive Page 1

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