On August 17, 2026, the UK-based Space Energy Initiative (SEI) published a whitepaper titled “The Case for Space Based Solar Power,” urging the United Kingdom government to co-fund a first orbital demonstrator satellite to secure sovereign, low-cost clean electricity.
The proposal outlines how space-based solar power (SBSP) can stabilize the national electricity grid, address high industrial energy costs, and support reindustrialization initiatives by delivering continuous baseload power from geostationary orbit.
The policy paper is backed by SEI member Space Solar, the company developing the CASSIOPeiA satellite platform, which recently completed the world’s first 360-degree wireless power transmission demonstration.
Architectural Metrics and System Economics
The whitepaper presents financial and technical modeling positioning space-based solar power as a cost-competitive baseload electricity source. Primary technical specifications and economic projections detailed in the report include:
- Levelised Cost of Energy (LCOE): Modeled at approximately £30 per Megawatt-hour (£30/MWh) based on current heavy-lift launch costs, with projected declines toward £10/MWh as reusable launch capacity scales globally.
- Grid Integration and Savings: Independent analysis from Imperial College London indicates that every 2 Gigawatts (2GW) of installed SBSP capacity could save the UK energy system between £1 billion and £2 billion annually by mitigating grid congestion, reducing backup storage requirements, and providing flexible beam switching to high-demand regions.
- Continuous Operations: Positioned in geostationary orbit, SBSP platforms capture uninterrupted solar radiation to beam wireless high-frequency energy continuously to terrestrial rectifying antennas regardless of diurnal cycles or weather conditions.
The whitepaper emphasizes that the core subsystems required for space-based solar harvesting, high-efficiency photovoltaics, and microwave power beamsteering have achieved technical proof-of-concept, shifting the sector’s focus from scientific discovery to manufacturing scale and heavy-lift logistics.
“Our market leading CASSIOPeiA design offers continuous power with the reliability of nuclear but at a fraction of the cost, and with no need for water cooling or waste disposal,” stated Martin Soltau, Co-Chief Executive Officer of Space Solar. “We have the supply chain skills and expertise across the UK to be a global leader in space-based solar power. A first orbital demonstrator is the essential step to positioning Britain to capture this unique opportunity creating thousands of skilled jobs and a source of clean, abundant, affordable and sovereign power. It delivers directly on the government’s urgent priorities for energy security, re-industrialisation and growing prosperity for all regions of Britain.”
Commercial Demonstration Roadmap and Scaling Timeline
To de-risk private investment and capture market share against competing international initiatives in the United States and China, the Space Energy Initiative is requesting public co-funding to deploy a Megawatt-scale orbital pilot plant within five years. Space Solar plans to leverage domestic supply chain capabilities across robotics, semiconductors, and high-frequency power electronics to execute the pilot mission, serving as a stepping stone toward Gigawatt-scale commercial energy delivery.