During same period, a systematic and successful transition from oil to renewable energy for heating purposes and decisions to buy green electricity has resulted in 95% energy supply from bioenergy or recycled energy for heating and cooling of buildings and 100% green electricity bought by public procurement in Region Gotland.
The municipality of Gotland (now Region Gotland) manages over a half million square meters heated building area; schools, day nurseries, the hospital and other care premises, libraries, sport arenas, public swimming pools, offices et cetera. For heating and electricity needed in the building and all other electricity consumption, for example in water works, sewer sewage treatment works and street light, the Region uses over 100 million kWh electricity and heat each year.
The work with energy efficiency improvement started thanks to initiatives from engaged operation personnel who could understand the potential and show results of their own measures. The establishment of the energy optimization team was formalized many years later, after subsequent years showing lower energy demand in the buildings. The measures are also entirely in line with politically adopted overall environment and climate objectives in the municipality's environment program and energy plan.
Existing equipment/systems are optimized in all buildings in order to have every building operated as close to optimum as possible with maintained comfort. Such things as indoor temperatures, operation hours of different systems, night reduction of indoor temperatures and lights are adjusted and monitored. Other measures are improved routines concerning management and monitoring in order to make equipment for heating/cooling, ventilation and water supply work in its most effective mode.
The work is conducted in near cooperation with the client/user of the building and operative management personnel in the building.
Example of areas for mapping the buildings energy performance.
S:t Hans school in Visby in the background.
The circle diagram represents average figures for Region Gotland’s buildings.
Existing energy performance statistics is analyzed. Rising trends or temporary peaks are controlled and dealt with.
By strictly following a cycle for continued improvements (the PDSA-cycle) Region Gotland systematically carries out the work on improvement. This admits problems to be dealt with in the most efficient way and at the same time achieve permanent improvements.
In year 1997 the annual energy use in the municipality of Gotland's buildings was172 kWh/m2 heat and 83 kWh/m2 electricity. Until year 2010 the energy use has decreased to 108 kWh/m2 heat and 74 kWh electricity/ m2.
The share of renewable energy sources is 100% Green electricity, 95% bioenergy or recycled energy for heating.
Decisions of measures to reach further 14% energy effectiveness in municipal operations until year 2014 are underway; probably energy performance contracting (EPC) will be a necessary tool to solve the personal and financial resources.
Use of electricity and heat in municipal buildings on Gotland, Sweden, between 1997 and 2010 (in kWh/m2 and year). Click on the image to make it bigger.
The following success factors, explained below, are identified by experiences of energy efficiency measures in Region Gotland.
Energy statistics – figures and results are necessary
- Adopt clear, reachable and measurable objectives for energy use in; for example energy use per m2 building area and share of oil/pellets/district heating or others.
- The outcome shall be logged and followed up at least once per month, high/low consumption and trends will respectively be explained (responsibility for results).
- Use suitable and compatible software for the logging and processing of energy consumption statistic in buildings (for example we use Vitec & Summarum Media).
- Evaluation and reporting of outcomes as diagrams (situation and trend).
- Measure every building and media (energy carrier) separately.
- Set up a specialized team for energy performance optimization, preferably staff with this as their only responsibility (otherwise overwhelmed of other duties).
- Decide from who and when logging of results will be performed (+/-3 days).
- Allocate a well defined budget with associated responsibilities within the team.
- Formulate duties and authorizations.
- Decide about indoor climate standards for running optimization, for example indoor temperature standards, operation times during vacations, night/weekend temperature reductions et cetera.
- Be aware of the consequences of the above (analyze).
- Adopt building standards for new construction and refurbishment projects; develop projects instructions. Build correct from start.
- A distinct commitment from the management is required for a successful implementation. Directions, objectives, leading indicators and budget shall be agreed and documented.
- Preferably shall commitments, standards and indicators be integrated routines in the organization’s quality management system and communicated in the own organization; both with building service staff and users of the building.
The economic value of the totally saved energy in 2009 years' energy costs is estimated to 2.5 million € a year in 2009 or a total of 7.4 million € since the work begun.
For further information, please send an email to Quality engineer Mr. Johan Malmros