Anthea Torr, CEO of Enchantrix, loves her biogas digester. She feeds it food waste, sewage and horse manure. The digester overflow goes via a reedbed into a holding tank from where it is used to fertilise and irrigate her fruit and nut trees. She uses the biogas to cook, boil water and make toast. Biogas has helped Anthea almost achieve her goal of being independent of the electricity grid.