Spare solar shouldn’t go to waste.
At noon in Lagos, one roof makes more power than the house can use, while the shop next door runs a generator. Sunpool lets the shop buy it.
Generator power costs 3 to 4 times the grid
- Diesel generator₦950/kWh
- Petrol generator₦750/kWh
- Grid, Band A₦225/kWh
Minister of Power, via TheCable, Oct 2024 (opens in a new tab)Business A.M. (opens in a new tab)
51%
of Lagos residents rent. They can’t put panels on the roof.
Fortren & Company, via Nairametrics, Sep 2026 (opens in a new tab)Your prepaid meter stays yours
Grid units can’t be resold, and Sunpool never touches them. It sells solar from a neighbour’s roof, on its own line.
Grid units
Bought from your DisCo and locked to your meter number. Nothing changes.
Neighbour’s solar
A shared line from their roof to your socket, with a small smart meter. You load kWh in Sunpool and it counts them down, like prepaid units.
Who it’s for
Renters
No roof of your own, still on solar.
Shops
Daytime power below generator cost.
Estates
One shared line, many rooftops.
Companies
Certificates that count each kWh once.
Proposed users for a Lagos pilot, not existing customers.
What’s real
In production, certified smart meters sign readings on the device, on Celo mainnet inside MiniPay.
- Real on testnet
- Listings, USDC payments, certificates, double-claim rejection
- Simulated
- The smart meter and its readings, the Surulere solar curve on the chart
- Live data
- Sunlight forecast for Surulere from Open-Meteo, used to verify readings
- Estimated
- CO₂ avoided, at 0.456 kg per kWh
Security & trust
The chain makes every claim count once. The weak link is whoever signs the meter reading, so that step is checked too.
Counted once
Each reading ID can be consumed once on-chain. A second claim reverts, so no kWh backs two certificates.
Checked against the sun
Before the meter signs, an AI check compares the reading with today's sunlight in Surulere, the roof size and the seller's listings today. Impossible amounts are refused.
Keys that can be revoked
Only registered meter keys can sign. A leaked or tampered meter is revoked on-chain; in production each meter keeps its key in a secure chip.
Demo limits: one shared meter key, rooftop size declared by the seller, one admin account. Read the threat model