September 23 - 24, 2013
NEW YORK CITY
The 200 buildings of the university campus are connected through a district energy system with all utilities centrally generated on campus. The campus is constantly growing both in physical size and energy demands. All utilities on campus are generated from natural gas. However, due to the high efficiency by the campuss district energy system, and advances in the efficiency and operations in utilities generation, carbon emissions have been held at steady levels in spite of constantly increasing campus demands.
The system covers 98% of the heat demand in the municipality with heat from CHP plants and waste incineration. The system is part of a coherent district heating system in greater metropolitan area, covering city center and 15 suburban municipalities. Two heat transmission companies transport heat from 10 CHP plants to local distribution system. A heat plan is part of the citys climate plan, where the municipality sets the target of a 20% CO2-reduction by 2015 and a vision to be completely CO2-neutral by 2025.
The district heating network covers a large portion of the urban community. The network was initially designed to recover surplus energy from the local steel works. Adding three cogeneration units and a second surplus heat heat capture unit at the steel plant, increased the share of recovered energy in the network to 90%. The heating network is an essential component of the regions environmental policy, and enables the community to maintain and enhance the regions reputation as a leading industrial area.
By the end of the 1970s, Gothenburg system had grown to encompass eight large ‘district heating islands’ in Gothenburg. All power and heating plants were fed by oil-fired hot water stations. At this time, electricity prices were low and oil prices had reached record heights. The situation for district heating operations in Gothenburg was not economically sustainable.
Goteborg Energi decided to make a change. The eight district heating islands were linked together, producing a connected network. The next major step was receiving large amounts of waste heat. Fuel efforts began in the early 2000s. Rya heating plantas hot water boiler was converted from natural gas to wood pellets in 2003. In addition to waste heat generated by electricity production in Gothenbiurg’s plants, waste heat is recycled from two large refineries and from the region’s waste incinerator at Renova. Waste heat recovery by Goteborg Energi’s district heating network produces great environmental benefits. Today, nearly 80% of the city district heating is based on waste heat.