42 HYDRONEWS

ACHIEVING CLIMATE GOALS

Nedre Otta hydro- Norway – Following a successful commissioning generators including excitation systems. The con- power station 270 km phase, the Nedre Otta hydropower plant in Norway tract further included the mechanical equipment to north of Oslo is pro- was handed over to the customer in June 2020. Nedre be installed in the waterways, including trash racks, ducing clean energy Otta is located in the municipalities of Sel and Vågå, intake gates, draft tube gates, as well as cooling and for the municipalities in the community of Oppland some 270 km north bilge systems. Installation, supervision, and commis- of Sel and Vågå. of Oslo. This new power plant is equipped with two sioning rounded out the contract scope. 43 MW Kaplan turbines and operates as a run-of-river plant with no intake reservoir. The power plant’s owners are AS Eidefoss with 50% and Hafslund E-CO with 50% (E-CO Energi 27% and Back in 2016, ANDRITZ Hydro was awarded with a Eidsiva Vannkraft AS 23%). Through participation in the contract to supply the complete electro-mechanical development of Nedre Otta, E-CO Energi has con- and hydro-mechanical equipment for this project, as firmed the company’s long-term strategy of develop- well as excitation systems. The extensive contract also ing new hydropower capacity and its position as an comprised design, manufacturing, and delivery of important and long-term player in Norway. This is also mechanical equipment in the powerhouse including a project that contributes to achieving the country’s turbines, main inlet valves (MIV), inlet pipes, hydraulic 2020 climate goals, relevant to all hydropower proj- pressure units (HPU), electronic turbine governor, and ects in Norway today.

“With an estimated produc- tion of approximately 315 GWh TECHNICAL DETAILS annually, of which 270 GWh is Nedre Otta: new production, Nedre Otta Scope output: 2 × 43 MW / 2 × 50 MVA supplies enough power for over Head: 50 m 15,000 households.” Voltage: 11 kV Speed: 250 rpm Nedre Otta uses the natural fall of the Otta River at Runner diameter: 3,525 mm the existing dam at Eidefossen. A new powerhouse Av. annual production: 315 GWh is located after a 4 km stretch of 95 m2 tunnel down- stream of the dam. A tailrace tunnel with the same ––– NORWAY, NEDRE OTTA NEDRE NORWAY, ––– cross section runs for another 4 km until the outlet to the river. With an estimated production of approxi- mately 315 GWh annually, of which 270 GWh is new production, Nedre Otta is currently Norway’s largest recently constructed hydropower project and will pro-

SITE REPORT SITE duce enough power for over 15,000 households. requiring Information BIM(Building Modeling)and pletely without old-fashioned paper drawings. By out theentire project, from start to takeover, com- major project where thecustomer decidedto carry tions, withasingle exception. Thiswas thefirst characterized by conventional andproven solu- solutions andimplementation methodology, was The whole project, both in terms of technological power plant. of thepower production from theNedre Otta hydro- of themunicipalities willhave aperpetual rightto 3% to beused for mitigationmeasures. Inaddition,each each of the municipalities will receive NOK 5 opment agreements have beenentered into where With thetwo host municipalities, Vågå devel andSel, - /2021№34 million Håvard Haugstulen [email protected] than by contractual schedule. hand-over to thecustomer inJune, onemonthearlier project was completed inearlysummer 2020 with and allrelated security andhealthmeasures, the Despite thestrain of thesituation dueto COVID-19 professional groups, withfew errors andconflicts. munication between thevarious implementation andimprove com- client managedto streamline a three-dimensional model,the AUTHOR was completed inearlysummer 2020, onemonthearlierthanscheduled. 141 TWh. production of about hydropower, withanannual tion relies almost entirely on domestic produc electricity - ing petroleum exporters, one of theworld’s lead- Although Norway is

and allrelated security andhealthmeasures, theproject Despite thestrain of thesituation dueto COVID-19 HYDRONEWS 43 SITE REPORT ––– NORWAY, NEDRE OTTA315 GWh