The municipality has been implementing energy efficiency measures since the 1980s, meaning that all low-hanging fruit had already been picked, e.g. timers were already in use. All the buildings - including 11 kindergartens, 12 nursing homes and healthcare centres - had to remain in use whilst the upgrades were executed.
The measures were completed in the spring of 2015, and the project is now in the guarantee phase during which the investment is repaid in form of energy savings. Total investment given all the criteria laid down for the project was € 4 million, which will be repaid within 6-7 years. The municipality received around € 760 000 in Enova subsidies for the EPC project.
We implemented 378 measures designed to reduce energy consumption in 37 buildings covering a total floor area of 130,000 square metres over a period of 18 months. Venstøp School for example used to be an energy drain, before we implemented measures such as a control system, heat pumps, performance optimisation and a new ventilation system.
A common web-based control system has been installed at all 37 buildings, allowing the janitors and Caverion's energy consultants to monitor and control heating, ventilation, lighting and anything else connected.
Details of energy efficiency measures
378 measures within automation, ventilation, heating and sanitation, electrical systems, lighting and building engineering, including:
replacement of existing ventilation units
replacement of ventilation fans and heat exchangers, old systems cleaned
extra insulation of pipes, components and lofts
installation of heat pumps (air in gymnastic halls, water in old boilerhouses)
installing lighting control
optimising heating plant (water treatment, radiator valves, cleaning water system)
optimise energy consumption in swimming halls
replacement of windows
No. of buildings: 37 (11 kindergartens, 14 schools, 12 nursing homes/healthcare centres)
Number of measures: 378
Investment: € 4 million, ex-VAT
Estimated energy savings: 7,257,369 kWh p.a. (29.3% reduction)
Estimated output savings: 927 kW
Enova subsidy: € 760 000
Repayment time: 6-7 years
Øystein Fjellheim, Senior Energy Consultant