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Context:
The International Energy Agency’s ‘Renewables 2024’ report highlights that solar power will drive 80% of global renewable energy growth by 2030. However, ground-based solar faces limitations such as intermittency, weather dependency, and high land requirements. A recent study by King’s College London suggests that space-based solar power (SBSP) could potentially supply 80% of Europe’s renewable energy needs by 2050.
What is Space-Based Solar Power (SBSP)?
- Involves placing solar power satellites in geostationary orbit to capture continuous solar energy.
- Converts sunlight into microwave energy, beams it to Earth, and reconverts it to electricity at ground stations.
- Utilizes mirror-like reflectors to ensure panels always face the sun, providing dispatchable, zero-carbon energy.
Advantages of SBSP
- Continuous Power Supply: Operates 24/7, unaffected by weather or day-night cycles.
- Higher Energy Yield: Solar radiation in space is stronger than on Earth’s surface.
- Solution to Land Constraints: Eliminates need for large land areas for solar farms.
Key Findings of the Study
- Simulations of NASA’s heliostat swarm and planar array designs show technical feasibility.
- Could solve intermittency issues faced by terrestrial renewables like wind and solar.
Challenges & Concerns
- Economic Viability:
- Requires gigantic infrastructure both in space and on Earth.
- Launch costs and construction expenses remain prohibitively high.
- Scale of Operations:
- A single satellite might span 1 km across; ground receivers would be 10 times larger.
- Hundreds of launches required, compared to 40 for the International Space Station.
- Operational Risks:
- Orbital congestion, transmission interruptions, and beaming variability not yet fully addressed.
- Timeline:
- Cost-effectiveness may only be feasible post-2050, pending major technological breakthroughs.
