ApexCeloGrid — a public electricity ledger for Nigeria, live on Sepolia

Community Africa
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Hi Celo community,

Sharing a small public-goods project I built on Celo — it fits the ReFi / public-goods thesis here, and I want feedback and connections.

The problem

Nigerian electricity data covers the grid (TCN, the DisCos, the big GenCos). It doesn’t cover the diesel gensets and solar mini-grids most Nigerians actually run on. The public sources are missing the biggest share of the story — which is a hole in the map for anyone doing policy research, climate finance, mini-grid operations, or SME power-cost underwriting.

What I built

ApexCeloGrid — an open, append-only smart-contract ledger for electricity generation records. Registered operators (mini-grid managers, generator owners) submit readings; anyone can read without a wallet.

  • Solidity contract with a site registry + operator-authorisation model
  • Hardhat suite, 27 tests passing
  • Node.js CLI for registration + submission
  • Minimal HTML viewer — no framework, no build, no wallet to read
  • Gasless (v1.1) — operators sign readings off-chain (EIP-712); a relayer pays gas, so a manager with a phone can submit without holding CELO
  • Corrections append a linked record instead of overwriting — audit trail intact
  • MIT licensed

Live on Celo Sepolia

Why Celo (honest reasons)

  • Public chain — nobody, including me, can rewrite the ledger. That’s the point.
  • Sub-cent fees to write; free to read.
  • Mobile-first — matches how mini-grid operators actually work.
  • Carbon-negative — a climate-data project shouldn’t run on a chain that undoes the climate case. This is the only L1/L2 where that framing holds up cleanly.
  • Ethereum L2 (2025) — Ethereum-level security without Ethereum-level cost.

No token, no subscription, no premium tier. A public utility, posted for adoption.

What I’m asking for

  1. Feedback on the contract design — especially the append-only correction model, the operator-authorisation flow, and the EIP-712 gasless path. Gotchas or better patterns welcome.
  2. Intros to the right ecosystem groups — Public Goods, ReFi Collective, Climate Collective, Kolektivo. If this fits a track, point me to the right person.
  3. Adjacent African-infrastructure builders on Celo (energy, agri, water metering) — I’d like to compare notes; there’s probably shared plumbing worth reusing.

Not raising, not launching a token, not seeking a grant yet — I just want the tool in the hands of operators, regulators, and researchers who can use it. Happy to answer questions in-thread.

— Francis Oyakhire, Co-Founder, Apex Grid Technologies (Nigeria)

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