[en] This final degree project presents the preliminary study for the installation of a hydroelectric power plant in the irrigation network of the municipality of Lens, Switzerland, which was carried out from July to October 2022 at the 'Haute École Spécialisée de Suisse occidentale, Valais/Walis'. In this project, a closed conduit from the Grand Bisse de Lens to a water reservoir for irrigation is analysed. Between the Grand Bisse de Lens and the reservoir there is a difference in height of 96 metres, with a flow rate of approximately 70 l/s. After studying the terrain and understanding it, two possible scenarios are analysed. The first scenario consists of installing a hydropower plant before releasing the water into the reservoir. In terms of hydraulic development, this is not very complex, but when it comes to connecting the hydroelectric power plant to the grid, the problem of the distances to the possible connection rooms arises, given that this reservoir is isolated. Therefore, a second scenario arises in which it is decided to extend the closed conduit to the next town called Flanthey. This would reach a height difference of 290 metres, but hydraulically there would be the problem of feeding the reservoir and therefore not knowing the exact flow of water that could be turbined. In both scenarios, a Pelton turbine with 2 injectors is chosen. After sizing and budgeting the different scenarios, the average price is between 463.000 Swiss Francs (CHF) and 870.000 CHF for scenarios 1 and 2, respectively. To achieve an internal rate of return (IRR) of 4.5% over 25 years, it is considered that the optimal energy price for the implementation of any of the proposals to be economically viable should be between 28 CHF cents per kWh and 88 CHF cents per kWh, respectively.

[eu] Gradu-amaierako lan honetan, Suitzako Lens udalerriko ureztatze-sarean zentral hidrauliko bat instalatzeko aurretiazko azterketa aurkezten da. Azterlan hori 2022ko uztailetik urrira bitartean garatu zen, "Haute École Spécialisée de Suisse occidentale, Valais/Walis" delakoan. Proiektu honetan, Grand Bisse de Lensetik ureztatzeko ur-urtegi baterainoko hodi itxi bat aztertzen da. Grand Bisse de Lens eta urtegiaren artean 96 metroko desnibela dago, 70 l/s-ko emariarekin gutxi gorabehera. Lurra aztertu ondoren, bi egoera posible aurkezten dira. Lehenengo egoera da zentral hidrauliko bat jartzea ura urtegira iritsi aurretik. Garapen hidraulikoari begira, ez du konplexutasun handirik, baina zentral hidroelektrikoa sarera konektatzeko orduan, arazoak sortzen dira balizko konexio-geletarako distantzietan, urtegi hori isolatuta baitago. Hori dela eta, bigarren egoera azalarazten da, zeinen Flanthey izeneko herriraino hodi itxia luzatzea erabakitzen den. Horrekin 290 metroko desnibelera iritsiko litzateke, baina hidraulikoki urtegiaren elikaduraren arazoa sortuko litzateke, eta horrekin batera, turbinara irits litekeen ur-emaria zehatz-mehatz ez jakitea. Bi egoeretan, 2 injektoreko Pelton turbina bat erabiltzea erabaki da. Bi egoera hauek dimentsionatu eta aurrekontuetan sartu ondoren, batez besteko prezioa 463000 franko suitzarren (CHF) eta 870000 CHF artean dago, 1. eta 2. kasuetarako, hurrenez hurren. 25 urterako % 4,5eko barne-itzulerako tasa (TRI) lortzeko, proposamenetako bat ekonomikoki bideragarria izateko energiaren prezio optimoa kWh bakoitzeko 28 CHF zentimo eta kWh bakoitzeko 88 CHF zentimo artekoa izan beharko litzateke, hurrenez hurren.