 The Flat Holm project aims to develop the island as a showcase of sustainable technologies. The original power supply consisted of several diesel generators at different properties and unconnected to each other. In 2006, underground cables were installed to form a ‘ mini-grid ’ between the farmhouse, workshops and the fog horn keeper's cottage. This was powered with a (13.5 kW) inverter / charger system located at the farmhouse with the farmhouse diesel generator as back-up.
