University of Oulu

Ali Torabi Haghighi, Faisal Bin Ashraf, Joakim Riml, Jarkko Koskela, Bjørn Kløve, Hannu Marttila, A power market-based operation support model for sub-daily hydropower regulation practices, Applied Energy, Volume 255, 2019, 113905, ISSN 0306-2619,

A power market-based operation support model for sub-daily hydropower regulation practices

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Author: Torabi Haghighi, Ali1; Ashraf, Faisal Bin1; Riml, Joakim2;
Organizations: 1Water, Energy and Environmental Engineering Research Unit, University of Oulu, PO Box 4300, 90014, Finland
2Royal Institute of Technology (KTH), Teknikringen 10b, 114 28 Stockholm, Sweden
3Finnish Environment Institute (SYKE), Latokartanonkaari 11, 00790 Helsinki, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.2 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2021-09-14


With increasing power production from renewable energy sources, sub-daily variations in energy demand need to be balanced. Today, hydropower is commonly used as balancing power. In this study, we quantified the impact of capacity constraints, in terms of reservoir volume and hydropower capacity, on the potential to comply with instant energy demand. To evaluate the impact, we developed two new metrics, power market impact and system efficiency ratio, which are based on two threshold flow regimes derived from natural flow as lower threshold release and regulated flow (based on hourly energy prices) as upper threshold release. The operation support model comprises 96 different regulation scenarios based on varying combinations of hydropower and reservoir capacities. For each scenario, an hourly water balance was simulated, to obtain the highest complying with upper threshold release based on actual energy demand. We tested the framework on the Kemijoki river with defined thresholds based on the natural flow regime (tributary river Ounasjoki) and the hourly energy price in Finland in 2017, and estimated the impact of regulation on hourly flow regime at the Taivalkoski hydropower station. The annual flow regime impact in 2013, 2014 and 2015 was estimated to be 74%, 84% and 61%, respectively, while the monthly impact varied from 27% to 100%. Our framework for evaluating interactions between the power market and sub-daily regulation practices is a useful novel tool for sustainable river management and can be easily applied to different rivers and regions and evaluated for different timescales.

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Series: Applied energy
ISSN: 0306-2619
ISSN-E: 1872-9118
ISSN-L: 0306-2619
Volume: 255
Article number: 113905
DOI: 10.1016/j.apenergy.2019.113905
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: This study was supported by Maj- and Tor Nessling foundation (Grant No. 201800109), the BioWater project, Nordic Center of Excellence, funded by NordForsk (Project Number 82263), the Swedish Strategic Research Project STand UP for Energy, Academy of Finland (EcoRiver, project number 323810) and Kvantum Institute spearhead project.
Academy of Finland Grant Number: 323810
Detailed Information: 323810 (Academy of Finland Funding decision)
Copyright information: © 2019 Elsevier Ltd. All rights reserved. Published in this repository with the kind permission of the publisher.