The Jumpstart Opportunities to Unleash Leadership in Energy Storage with 1K Energy Storage Systems (JOULES-1K) Phase 2 Program (previously Pioneering Railroad, Oceanic and Plane ELectrification with 1K energy storage systems [PROPEL-1K]) are projects chosen from Phase 1 of the JOULES-1K program which show the most promise of developing novel energy storage to support drones, robots, Electrical Vertical Take-Off and Landing (eVTOL) aircraft, and other applications that would benefit from ultra-high-density storage systems.
Office of NEPA Policy and Compliance
February 27, 2026
Estimated Read Time min
The Jumpstart Opportunities to Unleash Leadership in Energy Storage with 1K Energy Storage Systems (JOULES-1K) Phase 2 Program (previously Pioneering Railroad, Oceanic and Plane ELectrification with 1K energy storage systems [PROPEL-1K]) are projects chosen from Phase 1 of the JOULES-1K program which show the most promise of developing novel energy storage to support drones, robots, Electrical Vertical Take-Off and Landing (eVTOL) aircraft, and other applications that would benefit from ultra-high-density storage systems. Specifically, project teams will develop storage technologies that achieve energy density targets that equal or exceed 1,000 watt-hours per kilogram and 1,000 watt-hours per liter at the end of life and at the net energy storage system level.