The Department of Defense (DOD) is seeking proposals for the Hybrid Electric Powertrain, Power, and Propulsion Systems (HEPPS) Open Topic. This solicitation aims to bring valuable small business innovations to the Army and expand the relevance of the Army SBIR program to firms that don't typically compete for SBIR awards. The HEPPS Open Topic accepts both Phase I and Direct to Phase II submissions. Phase I proposals can receive up to $250,000 for a 6-month performance period, while Direct to Phase II proposals can receive up to $2,000,000 for a 24-month performance period. The research should focus on HEPPS technologies compatible with various vehicle systems, optimizing fuel economy and performance, facilitating new use cases and tactics, providing an optimized balance for efficient aircraft operation, delivering increased onboard electrical power, and meeting military operational requirements. Phase I submissions require a 5-page technical volume, an 8-slide commercialization plan, and a "Statement of Work" outlining deliverables. Phase II submissions require a 10-page technical volume, a 5-page feasibility documentation, an 8-slide commercialization plan, and a "Statement of Work." Phase II involves producing prototype solutions for edge and austere environments, developing a technology transition and commercialization plan, and evaluating products in a realistic field environment. Phase III focuses on dual-use applications such as reducing greenhouse gas emissions, optimizing fuel economy and performance, improving energy management strategies, and achieving lower weight and longer operating duration. The solicitation is open until March 31, 2025. For more information, visit the solicitation agency website.