The problem
Elvy needed a working residential virtual power plant within one month. The system would aggregate Ferroamp home batteries and dispatch them against the Nordic flexibility market through Flower. A wrong command could affect hardware in a customer's home or a live market position.
What Martian built
A small Martian team delivered the system in 27 days. An MQTT bridge normalizes household telemetry into BigQuery. A control plane executes charge plans, scheduled discharge, state-of-charge limits, and power derates with startup recovery. Authenticated inspector APIs and an operator TUI support discovery, snapshots, replay, and manual control.
We also built a web trading console. Operators can review charge plans by bidding zone, inspect individual facilities, and intervene at one site or across the portfolio.
Safeguards
Dry-run and read-only modes preview commands against live telemetry before they leave the system. A deterministic local simulator uses scripted Ferroamp telemetry and Flower dispatch so the full workflow can be tested without hardware or a market connection.
Result
Elvy's engineers have continued building on the production system. The rollout moved from read-only observation to active dispatch, and the fleet grew beyond the original pilot.
