This Solicitation opportunity from Department Of Defense was posted on March 18, 2026. The submission period has ended. Browse the details below for market research, or find similar active opportunities.
Promethean Clay
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The contract solicitation from DARPA, titled Promethean Clay, seeks innovative proposals aimed at fundamentally rethinking energy storage systems through a mechanical co-design framework. The goal is to achieve revolutionary advances in energy storage performance, safety, and operational stability at scales suitable for integration into electrically powered technologies. By treating energy storage not only as a chemical process but also as a mechanical system, the program intends to eliminate the need for the traditional rigid and heavy exoskeleton materials currently used in these systems. This approach is expected to deliver significant improvements including enhanced energy storage performance, greater thermal resilience, and improved safety, all of which are critical for successful system integration. Additionally, the program emphasizes domestic sourcing for materials and manufacturing to facilitate transition to commercial and government production systems. Technical advancements will be demonstrated on government-provided platforms. The solicitation explicitly excludes proposals focused on incremental improvements to existing energy storage components or new chemical formulations that do not address the mechanical design challenges posed by rigid inactive materials. Proposals must consider the complete energy storage system, including performance, safety, and thermal resilience across all materials involved. Research focusing solely on the development of new battery or fuel cell chemistries without tackling the mechanical design constraints will not be considered. The call for proposals carries a submission deadline of April 22, 2026, and falls under NAICS code 541715, with DARPA’s office in Arlington, Virginia as the contracting agency. Interested parties are encouraged to submit comprehensive research plans that align with the innovation and system-level focus mandated by this solicitation.
General Info
Timeline
Submission Closed
Organization & Contact Information
Full Description
Promethean Clay rethinks energy storage systems in a mechanical co-design framework to enable performance, safety, and operational stability in electrically powered technologies. Specifically, by thinking of energy storage systems as mechanical systems in addition to chemical systems, this program will ameliorate the need for the rigid, heavy exoskeletons used in energy storage systems today, resulting in (1) a generational improvement in energy storage performance through obviation of rigid materials, (2) a design that incorporates thermal resilience and safety needed for integration into systems, and (3) a pathway for domestic sourcing of materials and manufacturing. Improvements in energy storage – paired with safety and thermal viability – will be evaluated and demonstrated on a government-provided platform.
Specifically excluded is research that primarily results in evolutionary improvements to the existing state of practice, or research that pivots on exceptional claims that cannot be technically justified in the proposal. This includes:
• Proposals outlining improvement of individual energy storage components without consideration for the complete energy storage system and its performance, safety, and thermal resilience considering all included materials (active and inactive)
• Proposals aiming to design new chemistries for energy storage (e.g. new battery and/or fuel cell chemistries) or new concepts for energy storage without addressing the need to overcome the inclusion of inactive rigid materials
In addition to technical achievements, Promethean Clay aims to transition the manufacturing and design of solutions to commercial production and government systems.
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