The document describes a small hydropower plant located in Troistorrents, Switzerland. The plant has an installed capacity of 75 kW and produces 230,000 kWh of energy per year. It cost a total of €185,000 to build, or €0.80 per kW of capacity. The plant utilizes a 242 meter height difference between an intake chamber and surge tank to generate power. It is suitable for isolated networks and makes multipurpose use of existing water infrastructure with no need for additional structures.

1. Small hydro success stories Luigi Papetti ESHA

2. Troitorrents SHP

3. Troitorrents SHP Set on the drinking water network of Troistorrents (Valais, CH) municipality It works on the high difference of levels between the catchment chamber and the surge tank, as a pressure regulator device Typical application of energy recovery in high mountain remote areas

4. Troitorrents SHP

5. Troitorrents SHP

6. Troitorrents SHP Installed capacity 75 kW Net head 242 m Rated discharge 35 l/s Energy production 230.000 kWh/year

7. Troitorrents SHP Costs 2.450 Specific cost [€/kW] 0,80 Specific cost [€/kWh] 185.000 TOTAL [€] 25000 Design and supervision [€] 30000 Civil works [€] 130000 Electromechanical equipment [€]

8. The reasons of a success Suitable also for operation in isolated networks Multipurpose use of water No additional infrastructures needed (intake, waterways, etc. already existing)

9. GARDONE VAL TROMPIA PLANT Main characteristics Plant location

10. BASIC FIGURES

11. Gardone V.T. in XVIII century

12. Plan view of the eight plants Bernardelli Beretta I Beretta III Redaelli II Redaelli I Beretta II S.F.A.E. Gramineto channel Acqualonga channel Penstock LEGENDA Redaelli III Acqualonga+Gramineto channel Intake Powerhouse

13. Schematic profile of the plant

14. Penstocks Section A: open channel (202,8 m) Section A: siphoned channel (321,1 m) Section A: cast iron penstock (254,5 m) Section B,C,D1: GRP penstock (768,4 m) Section D2,E: steel & concrete penstock (357,1 m) Section E: tail race (358 m) Surge tank

15. Weir

16. The intake structures

17. Headrace channel: open air stretch

18. Siphon intake during construction

19. Cast iron pipe installation

20. Glass reinforced (GRP) penstock installation

21. Studio Frosio Steel penstock

22. Surge tank during site assembly

23. Powerhouse - Before

24. Powerhouse - After

25. ECONOMICS INVESTMENT 1.835.000 Other partners 1.555.000 Local municipality 3.390.000 TOTAL 845.000 Other partners 855.000 Local municipality 1.700.000 Electromechanical equipment 990.000 Other partners 700.000 Local municipality 1.690.000 Civil works

26. ECONOMICS INCOME AND O&M 5,6 Gross payback ratio [years] 610.000 NET INCOME [€/year] 70.000 O&M costs [€/year] 680.000 Income [€/year] 0,17 Energy price (incl. Green Certificates 8 years) [€/kWh] 4.000.000 Energy production [kWh/year]

27. ENVIRONMENTAL BENEFITS EMISSIONS 0,12 Particulates [tons/year] 2,40 NO x [tons/year] 3,80 SO 2 [tons/year] 2.680 CO 2 [tons/year]

28. The reasons of a success Partnership between local municipality and private investors Strong commitment of the local municipality Good social acceptance thanks to the creation of the awareness in the general public of environmental importance of the initiative Strict works supervision and control both from technical and administrative point of view Creation of private-public company to manage and operate the plant, acting independently in the energy market

29. THE END www.esha.be www.studiofrosio.it