Background The Greek defence ministry is one of the largest public bodies in Greece. Its military installations are major consumers of energy and, therefore, offer great potential for energy saving, which could lead to a significant reduction in Greece's greenhouse gas (GHG) emissions. Although military installations and the organisations under the jurisdiction of the defence ministry generally perform their activities in accordance with the principles set out in the defence ministry's environmental policy, there has not been a specific and recognisable framework for integrating energy efficiency into their management practices. Therefore, there is a need for a single, harmonised standard across the defence ministry, with a logical and consistent methodology for identifying energy saving opportunities and implementing energy efficiency improvements. Objectives In line with national goals for reducing energy consumption and GHG emissions, the MECM project will implement an Energy Management System (EnMS) in three main military facilities: the naval station at Souda Bay, the Larissa airbase, and the Triantafilidi army camp in Xanthi. The objectives of the project are: To improve the environmental and energy performance of Greek military services and installations, through the development and monitoring of an Energy Management System, and based on the newly introduced ISO 50001:2011. Special attention will be paid to defining a system that will take into account the special characteristics of military installations and their specific needs; To promote energy-management best practices and reinforce good energy-management behaviour within the Greek defence ministry; To offer guidance on measuring, benchmarking, documenting and reporting energy intensity improvements and their expected impact on GHG emission reductions; To provide a framework for promoting energy efficiency throughout the defence ministry supply chain; To contribute to the promotion of sustainable development principles within the military, and help facilities to evaluate and prioritise the implementation of new energy-efficient technologies; To explore ways to improve the energy and environmental performance of military services; To demonstrate the potential contribution of military services to green business and sustainable development within Greece and abroad (other EU armed services, public bodies in general, citizens that live near the three facilities, NGOs). Expected results: Maximisation of energy conservation and the rational use of energy at Greek military installations; Minimisation of the direct and indirect environmental impacts of military facilities; Guidance documents and case studies for improving the energy performance and the environmental management of Greek military services and installations; Sustainable development and good practice examples for different types of military facility; An increase in the Greek military's environmental awareness; An EnMS for military services and installations, which has been tested and validated, and is also transferable.