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Colenco Power Engineering Ltd - Report of Activities 2004 Avče Pumped-Storage Power Plant, Slovenia Colenco Power Engineering Ltd. was appointed by Soške Elektrarne Nova Gorica (SENG), a subsidiary of the Slovenia’s main power producer Holding Slovenske Elektrarne (HSE), as the design engineer for the detailed construction design of the Avče Pumped-Storage Power Plant.
The plant, which is to be located on the Soča river in the western Slovenian region of Primorska close to the Italian border, will be the country’s first pumped-storage power plant providing a number of benefits, including both peak load energy as well as primary and secondary power-frequency control. The project will involve the construction of a new upper reservoir with a capacity of 2.2 x 106 m3 and a 70 m deep shaft-power station (dial. 18 m) at the left bank of the existing Ajba reservoir. The water conveyance system will consist of a 700 m long headrace tunnel and penstock having a length of 1.3 km. The reversible pump-turbine and the motor-generator with vario-speed technology, operating under a gross head of approximately 520 m, will have a turbine capacity of 185 MW and a pump capacity of 180 MW. The plant is expected to produce 426 GWh/year, while requiring up to 553 GWh in the pumping mode.
Longitudinal section through shaft and outlet struture Following the preparation of the licensing project and the tender documents for the seven separate construction and supply contracts, Colenco was, together with a local partner, further appointed for the preparation of the details design for the civil works, the penstock and hydro-mechanical as well as the electro-mechanical equipment. Preparatory works at the construction site started in January 2005. Commissioning of the power plant is scheduled for December 2008. Kurt Wermelinger - Hydropower Plants WANO Peer Review
Colenco Power Engineering Ltd. has recently supported the nuclear power plants Lingen (Germany) and Leibstadt (Switzerland) in their preparation for this review. Eberhard Wyrsch - Nuclear Technology Improving the Safety of River Retaining Walls Adorned with blossoming roses, the listed walls along the Reuss River promenade between the restaurant "Bijou" and the old timber bridge have, for centuries, embellished the townscape of Bremgarten, Switzerland. After two years of monitoring, it was decided to refurbish the promenade so as to maintain safety for pedestrians as well as preserve as much as possible the original structure of the walls. 
Drilling micro stakes into the promenade For the development of such a project Colenco is in a position to supply specialists for all the required technical disciplines (geology, hydrogeology, soil mechanics, static and civil engineering), from the planning stage through to execution. Having recognized this advantage, the client entrusted Colenco with the necessary investigations, the elaboration of a refurbishment concept including construction, as well as bid tendering and project realization. Out of various initial concepts an unconventional method comprising a nailed rod wall was favoured, which was then promptly and competently compiled, dimensioned and carried out. Along the approximately
The approximately 130 m long, historical stone wall, which supports the promenade, could be kept in its original form, together with the rose bushes. Small retaining walls, in danger of toppling over, were reconstructed using reinforced concrete and the visible surfaces were plastered with mortar. This summer, the spirits will again be charmed by the sight and fragrance of the roses blooming on the renewed “Reussuferweg” in Bremgarten. Bruno Roggwiller - Water and Environment |
