Public Buildings

Energy renovation Celje

EE in buildings

Public officers, energy experts, cultural heritage preservation unit, politicians – city council

Public Buildings

Energy renovation of 8 public buildings in Municipality of Celje


PROJECT DESCRIPTION

Characteristics:

The Municipality of Celje is the majority owner of the buildings under consideration and investor in the energy renovation of its buildings. The Municipality of Celje covers a 95 km2 large area and is divided into 19 local communities and town squares. The Municipality of Celje counts 48,773 inhabitants (Statistical Office of Republic of Slovenia, 2015).

The goal of the project is the energy renovation of a set of buildings that will comply with sectoral legislation, guidelines and rules. The measures presented are optimal, carefully selected and defined according to the current state of the buildings. The energy savings potentials and the sense of comprehensive energy renovations were carefully defined, so the presented data are the basis for the decision to finance renewal through energy contracting.

Energy efficiency measures that have been set in the tendering process are: New building thermal envelope. It`s estimated that by applying thermal insulation (recommended EPS for the walls and mineral wool for the roof) could decrease the energy use by 30 % and 18 % respectively. New and energy efficient building fixtures. Windows with energy efficient PCV frames with double (or triple) -glazing and integrated exterior shading element to reduce solar heat gains, new doors were also needed.

Reconstruction of the Heating system. The proposed measures would include hydraulic balancing of the heating system, insulation of distribution pipes and installation of thermostatic valves. Advanced regulation of the heating system (an adaptation of the heating requirements with reference to the profile of usage). Hot water preparation, ventilation and cooling system are among specific measures for implementation in specific buildings.

New lighting system - The lighting system is mostly comprised of energy inefficient fluorescent lamps with traditional ballast and reflective raster’s. Energy efficient lamps, mostly CFLs, represent about 5 %of lighting. The proposed measures would include the substitution of inefficient ballasts with electronicones or changing the technology to LED entirely (depends on the economic feasibility). Furthermore, the regulation of the lighting system with motion sensors (particularly in hallways) and automatic shut-off switches when the building is not in use, will be considered.

The set of buildings consists of buildings where the potential energy savings are the highest, according to the amount of investment. Important selection criteria was also the use of the building. In most cases they are used by educational institutions, which have particularly profound effects for further the awareness of the need to save the energy. With this we have in mind the youngest generation, where the planned organizational measures are part of the educational process.


TECHNICAL & FINANCIAL DETAILS

Financing scheme:

EPC

Phase:

Implementation


KEY SUCCESS FACTORS (REPLICATION POTENTIAL)

1)The process itself: The final set of buildings was designed on the basis of the offer of the selected energy contracting company. On the basis of the Investment Project Identification Documentation, the Municipality of Celje published a public tender for the search of the energy renovation contractor with the energy contracting instrument. Two candidates applied Energetika Celje, d. o. o. and Petrol d. d. and the best bidder (Energetika Celje, d. o. o.) was selected through the competitive dialogue. Initial offer was the basis for amended expanded energy audits and amended investment programs. Total investment costs for deep energy renovations are 4.054.573,16 EUR, and financial sources are split among: Private partner – Energetika Celje, d.o.o., Municipality of Celje – budget, ELENA – grants for preparation of investment documentation and Ministry of Infrastructure of Slovenia (EU and national funds).

2)Time for decision making

The set of buildings consists of buildings where the potential energy savings are the highest, according to the amount of investment. Important selection criteria was also the use of the building. In most cases they are used by educational institutions, which have particularly profound effects for further the awareness of the need to save the energy. With this we have in mind the youngest generation, where the planned organizational measures are part of the educational process.