Executive Summary
The world’s energy debate has always been a debate about trade-offs: firm sources such as nuclear and hydro are reliable but cannot scale freely or be exported; variable sources such as wind and solar are cheap and clean but intermittent, imposing heavy balancing costs on the grid. Space-based solar power (SBSP) is the first technology to escape this trade-off. Measured against seven tests of an ideal energy source — reliability, affordability, sustainability, sovereignty, scalability, exportability and grid value — SBSP is the only source that scores strongly on all seven at once.
SBSP captures uninterrupted sunlight in orbit and beams it to receivers sited near demand, delivering continuous, dispatchable, low-carbon power that can be redirected between markets electronically rather than down fixed and costly cables. Space Solar’s analysis points to a levelised cost of around £30/MWh at scale at today’s launch costs, below every firm source and well below the true system cost of every variable source, falling towards £10/MWh as launch costs drop. Crucially, SBSP requires no scientific breakthroughs: every subsystem has already been demonstrated, so the task ahead is engineering and scaling rather than discovery.
A global race to capture this opportunity is already under way. In the US, Overview Energy has agreed to sell Meta 1GW of power from an SBSP concept and the US Air Force is investigating the technology for remote power in the Indo-Pacific; Japan is targeting its first orbital power-beaming demonstrator this year; and China’s programme now extends to military applications. The UK holds a genuine and rare lead through Space Solar’s patented CASSIOPeiA architecture, but that lead is fragile: without near-term public funding to de-risk a first demonstrator, the UK will cede the ground and the supply chain, high-value jobs and energy sovereignty that come with it, just as it did with the jet engine, the computer and graphene. SpaceX is rapidly establishing PhotoVoltaics manufacturing and Starship launch capacity with the stated goal to deploy 100GW per year of power in space within 5 years.
A Credible, Near-Term Path
A credible, near-term path. The sector’s pathway to a first pilot plant is achievable within five years, building incrementally on technology already validated on the ground and in orbit, with a credible route from there to meaningful commercial scale by midcentury.
Along the way. This funding buys more than the end goal: each stage builds capability and value in its own right. Wireless power transmission and in-space robotic assembly alone are multi-billion pound global opportunities by 2030.
The Ask
The Space Energy Initiative calls on the UK government to co-fund an orbital demonstrator, matching private investment to de-risk the next stage of development towards a MW-scale pilot plant within five years. This is a modest, near-term commitment set against the prize: a UK-led route to secure, low-cost, sovereign power and a domestic supply chain in a technology the UK is uniquely placed to lead.
- Co-fund an orbital demonstrator, matching private investment to de-risk the next stage
- Enable a MW-scale pilot plant in orbit within five years
- Build a UK-based space energy supply chain to capture high-value jobs and export opportunities