83 Acronym or Term Definition OTV Orbital Transfer Vehicle PV Photovoltaic R&D Research and Development RD1, RD2 Representative Design 1, Representative Design 2 Renewables Electricity technologies that do not consume fossil fuels (oil, coal, gas) as a primary input for production Renewables Electricity technologies that do not consume fossil fuels (oil, coal, gas) as a primary input for production RF Radio frequency RFP Request for proposals RPO Rendezvous and Proximity Operations SBSP Space-Based Solar Power SME Subject Matter Expert SSPIDR Space Solar Power Incremental Demonstrations and Research Project STMD Space Technology Mission Directorate TRL Technology Readiness Level U.S. United States
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