The intent of this document is to consolidate the information, evidences, facts and data that support and inform the first DNDCAF operational energy strategy DOES to address the need to improve our defence operational capabilities and their sustainability by decreasing the fully burdened cost of operational energy and reducing our supply chain vulnerabilities. It captures some of the knowledge that resulted from the DOES working group discussions and workshops with selected experts and organisations. Given the complexity of the domain and potential misinterpretation of raw data available in the various records of transactions, their interpretation for the purpose of developing the strategy was addressed collectively by selected representatives from concerned DNDCAF L1s personnel. Such a collective view is necessary to ensure that an appropriate understanding of the energy challenges ahead permeates our DNDCAF culture and becomes part of our decision making. Then, how to address them holistically through the sustainability looking glass will open new avenues to improving our defence operational capabilities for operations here and abroad. Analyses of historical data and simulation results were used to develop the DOES energy baseline. That energy baseline was used to develop credible DOES targets. The baseline will be used later to assess the level of success of initiatives to achieve DOES targets. An inflation methodology was used to assess the potential savings of applying the DOES targets. Moreover, using simulation techniques with scenarios informed by previous operations, the impacts of DOES targets on expeditionary operations were estimated.