Naval capability is energy limited. As climate change is expected to intensify the rate of trans-boundary threats, the U.S. Navy will also need to meet increasing operational capability requirements as it faces new challenges from adversaries who are gaining technological advances. The Department of the Navy’s Climate Action 2030 strategy builds on a decades-long foundation of climate action across the Navy and Marine Corps and sets a course to meet national and global targets to reduce the threat of climate change. The Secretary of the Navy has addressed operational emissions by focusing on initiatives that decrease emissions while increasing capability as part of the government’s net-zero emissions goal by 2050. Within this context, the U.S. Navy will need to accelerate its efforts to advance “hybridization, electrification, alternative lower-carbon fuels, and advanced propulsion solutions for both existing and future tactical platforms in all domains.” Both the U.S. Navy and NATO recognize the challenges and risks that climate change presents to global security. This paper discusses how the U.S. Navy will deliver power to capability, balancing increasing operational capability requirements with the need to integrating climate considerations into strategy, policy, and partner engagement. The paper will be organized as follows: First, operational capability demands will be identified, highlighting the energy intensive systems required to develop and sustain lethal capabilities for warfighting advantage. We then present key technology developments, including how improved propulsion and hybridization will provide increased flexibility for future capability upgrades, against the backdrop of an expanding climate crisis. We conclude with a detailed discussion of how the U.S. Navy can formalize the application of Model Based Systems Engineering (MBSE) tools to help balance increasing operational capability and associated power and energy system demands with the need to better manage and mitigate climate risk.