The ARPA-E / SC-FES joint program, GAMOW, supports innovative research and development (R&D) in a range of enabling technologies (beyond confinement plasma physics), defined further below and in Section I.D, required for commercially attractive fusion energy. Key attributes for any commercially attractive energy include economics, safety, reliability/availability/maintainability/inspectability (RAMI), and environmental sustainability. This program prioritizes R&D that will help establish both the technical and commercial viability of a range of fusion enabling technologies (depicted generically in Fig. 1), particularly in (i) all the required technologies and subsystems between the fusion plasma and the balance of plant, and (ii) cost-effective, high-efficiency, high-duty-cycle driver technologies. Applicants should leverage and build on foundational research in fusion materials, fusion nuclear science (FNS), plasma-materials interactions (PMI), and other enabling technologies, and focus on potentially transformative fusion-energy R&D that is informed by market-aware techno-economic analysis (TEA).