Space-based solar power

Space-based solar power
NASA · Public domain · source
Name	Space-based solar power
First proposed	1920s
Status	Concept / Demonstration

Space-based solar power

Space-based solar power proposes collecting solar energy in space and transmitting it to Earth using wireless power transfer. Proponents argue it can provide continuous, high-capacity electricity independent of day/night cycles and weather, while critics question cost, safety, and geopolitical implications. Research spans agencies and corporations including NASA, JAXA, ESA, DARPA, Caltech, MIT, ISRO, JAXA laboratories, and firms such as Mitsubishi Heavy Industries and Northrop Grumman.

Overview

Space-based solar power systems envisage large orbiting power stations—often in geostationary orbit—collecting sunlight with photovoltaic arrays or solar thermal collectors and converting it to microwaves or laser beams for transmission to ground station rectennas or receivers. Concepts involve collaboration among aerospace companies like Boeing, Lockheed Martin, Airbus, research institutions like Stanford University, University of Tokyo, Tsinghua University, and space agencies such as Roscosmos and Canadian Space Agency. Variants include orbital, lunar, and Lagrange point installations with differing trade-offs in launch mass, transmission distance, and persistence.

History and development

Early speculative ideas trace to inventors and engineers in the 1920s and 1940s; formal technical proposals emerged in the 1960s from Peter Glaser and studies by NASA and US Department of Energy in the 1970s. The 1980s saw design studies at Bell Labs and university consortia; the 1990s and 2000s produced prototype experiments and policy reviews involving DARPA and ESA. Renewed interest in the 2010s and 2020s followed advances at institutions like Caltech and MIT, private ventures such as SpaceX lowering launch costs, and national programs in China and Japan exploring demonstration missions.

Technology and design

Design proposals center on power collection (photovoltaic panels, solar concentrators), conversion to rf or optical carriers (microwave transmitters, high-power lasers), and reception (rectifying antennas, photovoltaic receivers). Engineering draws on work at Bell Labs, Sandia National Laboratories, Oak Ridge National Laboratory, Massachusetts Institute of Technology, University of California, Berkeley, Imperial College London, and companies including Siemens and General Electric. Structural concepts use lightweight composites developed by Toray Industries and Hexcel Corporation; power electronics leverage advances from Texas Instruments and Analog Devices. Control systems require guidance and attitude expertise exemplified by JPL missions and stabilization techniques used on International Space Station modules.

Launch, deployment, and infrastructure

Deployment depends on heavy-lift and frequent access to space via providers like SpaceX, Blue Origin, Arianespace, and national launch services such as ISRO and Roscosmos. Transit and in-space assembly may use robotic servicers from programs at Tethers Unlimited, Maxar Technologies, and Made In Space, while in-orbit manufacturing concepts draw on research at ESA and NASA testbeds. Ground infrastructure includes large rectenna farms near existing transmission networks managed by utilities like National Grid plc or operators such as PG&E; regulatory coordination would involve agencies like Federal Communications Commission and International Telecommunication Union.

Economics and policy considerations

Economic analyses compare levelized cost of electricity versus terrestrial renewables and nuclear, referencing cost models from IEA and World Bank studies and procurement frameworks like Feed-in tariff histories. Policy debates engage stakeholders such as US Department of Energy, European Commission, Ministry of Economy, Trade and Industry (Japan), and national legislatures over subsidies, export controls (e.g., ITAR-related controls), and international liability under instruments like the Outer Space Treaty and Liability Convention. Industrial strategy discussions link to national priorities pursued by China National Space Administration and programs in Japan and United Arab Emirates.

Technical challenges and risks

Major technical hurdles include mass-to-power ratios, thermal management, precision beam steering, space debris collision risk, and long-term survivability under radiation belt exposure. Risk analyses reference methodologies from NASA risk management, ESA safety standards, and lessons from events like Challenger disaster and Columbia disaster regarding system redundancy and launch reliability. Cybersecurity and command-and-control protections draw on practices from US Cyber Command and NIST frameworks; export control and dual-use concerns implicate Wassenaar Arrangement discussions.

Environmental and societal impacts

Environmental assessments examine impacts on atmospheric heating, ionospheric interactions, biosphere exposure to beam sidelobes, and space environment alteration, informed by studies at NOAA, USGS, IPCC, and UNEP. Societal implications include energy access debates involving organizations like United Nations agencies and development banks, geopolitics tied to dependence on orbital assets akin to concerns with GNSS and satellite communications, and public perception shaped by incidents involving Three Mile Island and Fukushima Daiichi Nuclear Power Plant. Ethical and equity issues relate to governance frameworks in forums such as United Nations Office for Outer Space Affairs and multilateral technology transfer negotiations.

Category:Space technology