The missing link between summer sun and winter heat.

Every temperate region on Earth lives the same paradox. Summer solar arrays produce far more electricity than anyone can use. Winter cold demands far more energy than the sun can deliver. The gap between those two seasons has haunted every energy planner for decades. Batteries are too expensive to bridge six months. Hydrogen pipelines do not exist. Imported gas burns the climate. We looked at copying nature.

Solarsynthesis.

Nature converts sunlight, CO₂, and water into a stable chemical — and holds it indefinitely until the moment energy is needed. That is not poetry. That is engineering. And it is exactly what the neighbourhood energy hub does.

At the heart of the system sits a local energy factory. In summer, excess PV electricity — the surplus that grids currently waste — drives an electrolyser. Water splits into hydrogen. That hydrogen combines with CO₂ in a catalytic reactor to produce a stable, energy-dense e-fuel. Liquid. Ambient temperature. Ambient pressure. Stored in an ordinary tank until December.

The CO₂ feedstock costs nothing. It comes from the factory's own flue gas — captured, recycled, and fed back into the synthesis loop. The carbon never escapes to the atmosphere. Every molecule released in winter combustion becomes raw material for next summer's fuel. A closed loop, running on sunlight.

In winter, that e-fuel flows into a combined heat-and-power unit, generating electricity and heat simultaneously. Both flow outward through the neighbourhood microgrid — into homes, offices, schools. The buildings are not passive consumers. They host the PV panels on their rooftops, feed the summer surplus in, and draw the winter output out. The neighbourhood breathes with the seasons, exactly as nature intended.

Why this has never been done at this scale. Not because the chemistry is exotic — it is not. Not because the components are unavailable — they exist. Because nobody integrated them. The electrolyser, the CO₂ capture unit, the catalytic reactor, the CHP, the microgrid, the building-integrated PV — mature technologies orbiting the same problem without ever touching each other. The energy hub is the integration. That is the invention.

And the economics work. This is where most clean energy concepts collapse — on the spreadsheet. The energy hub does not. Capital investment is shared across the entire community: less than 10% added to the cost of the buildings it serves, spread across dozens of owners, amortised over decades. No single household carries a prohibitive burden.

Operating costs are where the model becomes truly disruptive. No gas bill. No oil contract. No exposure to wars, embargoes, or speculative trading. The hub runs on sunlight and maintenance alone — predictable, local, and stable for the entire lifetime of the system. Energy independence is not a geopolitical slogan here. It is a line item on a balance sheet.

The sun has always produced enough energy to heat every building on this planet through every winter. We just never figured out how to bottle it.

We did.