New Ossasco Hydropower Plant / Switzerland

High head plant on the Ri di Cristallina stream with Tyrolean intake, sedimentation basin. Penstock and power house. At the altitude of 1'544.00 m a.s.l. it conveys the water from the stream to the underground sedimentation basin and then to the power house through a DN600 underground penstock.

Main Data

  • Intake 1'544 m a.s.l.
  • Sedimentation basin

    • L = 17.46 m
    • B = 2.5 m

  • Penstock in cast iron

    • Ø = DN 600
    • LTot = 1035 m

  • Power house 1'311.6 m a.s.l.

    • Expansion of water volume, QA = 0.7 m3/s
    • Level, HN = 220 m
    • Expansion capacity, PA = 1.6 MW

  • Pelton turbine vertical, 4 nozzles

    • PN = 1.36 MW
    • QN = 0.7 m3/s
    • n = 1000 U/min

  • Synchronous generator

    • S = 1.8 MVA
    • n =  1000 U/min

  • Transformer

    • PTR = 1.8 MVA

Client

CEL Bedretto SA, Bedretto

Consultant

IM Maggia Engineering Ltd, Locarno

Construction period

2010–2012

Construction costs

CHF 6.7 Mio.

Scope of services

Preliminary studies, preliminary design, final design, tendering, construction design, construction supervision.