Interesting article from the local government magazine.
Dunedin City Council is working with Smart Alliances and other collaboration partners to calculate and map the thermal energy available within one of Dunedin’s three wastewater networks. Smart Alliances’ Nick Meeten says the potential energy savings are huge.
Wastewater is an enormous untapped source of thermal energy available in every town and city. It can be used to provide a highly-efficient source for heating and / or cooling for buildings and industries, and independent research shows it can lower heating or cooling electrical energy use by approximately 40 percent. The infrastructure is already there and using this resource could help cities become more energy efficient and potentially earn new revenue. Yet this potential is currently almost totally ignored.