But Ms Gartland said 3,500 megawatts of waste heat in the form of steam and warm air had been identified around Dublin which could heat many thousands more homes and premises. "We're looking at data centres, cold storage warehouses, wastewater treatment plants, power stations - all of these units that produce waste heat from your bakeries right down to your local crematorium, even though that seems a bit eerie to think about waste heat coming from there." Ms Gartland is chief executive of Codema, the energy advisor to Dublin's four local authorities, and also director of the Irish District Energy Association (IDEA) which is working to make district heating standard in every city and town.