Flexible use of electricity in heat-only district heating plants
European energy systems are in a period of significant transition, with the increasing shares of variable renewable energy (VRE) and less flexible fossil-based generation units as predominant factors. The supply-side changes are expected to cause large short-term electricity price volatility. More f...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Aalborg University Open Publishing
2017-03-01
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| Series: | International Journal of Sustainable Energy Planning and Management |
| Subjects: | |
| Online Access: | https://journals.aau.dk/index.php/sepm/article/view/1632 |
| _version_ | 1797227049554804736 |
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| author | Erik Trømborg Monica Havskjold Torjus Folsland Bolkesjø Jon Gustav Kirkerud Åsa Grytli Tveten |
| author_facet | Erik Trømborg Monica Havskjold Torjus Folsland Bolkesjø Jon Gustav Kirkerud Åsa Grytli Tveten |
| author_sort | Erik Trømborg |
| collection | DOAJ |
| description | European energy systems are in a period of significant transition, with the increasing shares of variable renewable energy (VRE) and less flexible fossil-based generation units as predominant factors. The supply-side changes are expected to cause large short-term electricity price volatility. More frequent periods of low electricity prices may mean that electric use in flexible heating systems will become more profitable, and such flexible heating systems may, in turn, improve the integration of increasing shares of VRE.
The objective of this study is to analyze the likely future of Nordic electricity price levels and variations and how the expected prices might affect the use of electricity and thermal storage in heat-only district heating plants. We apply the North European energy market model Balmorel to provide scenarios for future hourly electricity prices in years with normal, high, and low inflow levels to the hydro power system. The simulation tool energyPRO is subsequently applied to quantify how these electricity price scenarios affect the hourly use of thermal storage and individual boilers in heat-only district heating plants located in Norway. The two studied example plants use wood chips or heat pump as base load representing common technologies for district heating in Norway.
The Balmorel results show that annual differences in inflow is still a decisive factor for Norwegian and Nordic electricity prices in year 2030 and that short-term (daily) price variability is expected to increase. In the plant-level simulations, we find that tank storage, which is currently installed in only a few district heating plants in Norway, is a profitable flexibility option that will significantly reduce the use of fossil peak load in both biomass and heat-pump-based systems. Installation of an electric boiler in addition to tank storage is profitable in the heat pump system due to the limited capacity of the heat pump. Electricity will hence, to a large extent, replace gas when heat demand exceeds the capacity of the heat pump. For the bio-based plant, we find that an electric boiler in addition to tank storage is not profitable in the normal electricity price scenario. The electric boiler investments are only profitable when electricity prices are as low as in the high inflow scenario. In that case the electric boiler will provide 17% of the heat supply in the example plant. Fuel prices for peak load and electricity grid tariffs are found to be decisive factors for the electricity use – and therefore flexibility options – provided by heat-only district heating plants. |
| first_indexed | 2024-04-24T14:34:37Z |
| format | Article |
| id | doaj.art-b1c202ba193a4ee190dbf90bbf5824d1 |
| institution | Directory Open Access Journal |
| issn | 2246-2929 |
| language | English |
| last_indexed | 2024-04-24T14:34:37Z |
| publishDate | 2017-03-01 |
| publisher | Aalborg University Open Publishing |
| record_format | Article |
| series | International Journal of Sustainable Energy Planning and Management |
| spelling | doaj.art-b1c202ba193a4ee190dbf90bbf5824d12024-04-03T01:34:57ZengAalborg University Open PublishingInternational Journal of Sustainable Energy Planning and Management2246-29292017-03-011210.5278/ijsepm.2017.12.4Flexible use of electricity in heat-only district heating plantsErik Trømborg0Monica Havskjold1Torjus Folsland Bolkesjø2Jon Gustav Kirkerud3Åsa Grytli Tveten4Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, N‐1432 Ås, NorwayFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, N‐1432 Ås, NorwayFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, N‐1432 Ås, NorwayFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, N‐1432 Ås, NorwayFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, N‐1432 Ås, NorwayEuropean energy systems are in a period of significant transition, with the increasing shares of variable renewable energy (VRE) and less flexible fossil-based generation units as predominant factors. The supply-side changes are expected to cause large short-term electricity price volatility. More frequent periods of low electricity prices may mean that electric use in flexible heating systems will become more profitable, and such flexible heating systems may, in turn, improve the integration of increasing shares of VRE. The objective of this study is to analyze the likely future of Nordic electricity price levels and variations and how the expected prices might affect the use of electricity and thermal storage in heat-only district heating plants. We apply the North European energy market model Balmorel to provide scenarios for future hourly electricity prices in years with normal, high, and low inflow levels to the hydro power system. The simulation tool energyPRO is subsequently applied to quantify how these electricity price scenarios affect the hourly use of thermal storage and individual boilers in heat-only district heating plants located in Norway. The two studied example plants use wood chips or heat pump as base load representing common technologies for district heating in Norway. The Balmorel results show that annual differences in inflow is still a decisive factor for Norwegian and Nordic electricity prices in year 2030 and that short-term (daily) price variability is expected to increase. In the plant-level simulations, we find that tank storage, which is currently installed in only a few district heating plants in Norway, is a profitable flexibility option that will significantly reduce the use of fossil peak load in both biomass and heat-pump-based systems. Installation of an electric boiler in addition to tank storage is profitable in the heat pump system due to the limited capacity of the heat pump. Electricity will hence, to a large extent, replace gas when heat demand exceeds the capacity of the heat pump. For the bio-based plant, we find that an electric boiler in addition to tank storage is not profitable in the normal electricity price scenario. The electric boiler investments are only profitable when electricity prices are as low as in the high inflow scenario. In that case the electric boiler will provide 17% of the heat supply in the example plant. Fuel prices for peak load and electricity grid tariffs are found to be decisive factors for the electricity use – and therefore flexibility options – provided by heat-only district heating plants.https://journals.aau.dk/index.php/sepm/article/view/1632flexible operationelectricity pricesrenewable energy integrationenergy storages |
| spellingShingle | Erik Trømborg Monica Havskjold Torjus Folsland Bolkesjø Jon Gustav Kirkerud Åsa Grytli Tveten Flexible use of electricity in heat-only district heating plants International Journal of Sustainable Energy Planning and Management flexible operation electricity prices renewable energy integration energy storages |
| title | Flexible use of electricity in heat-only district heating plants |
| title_full | Flexible use of electricity in heat-only district heating plants |
| title_fullStr | Flexible use of electricity in heat-only district heating plants |
| title_full_unstemmed | Flexible use of electricity in heat-only district heating plants |
| title_short | Flexible use of electricity in heat-only district heating plants |
| title_sort | flexible use of electricity in heat only district heating plants |
| topic | flexible operation electricity prices renewable energy integration energy storages |
| url | https://journals.aau.dk/index.php/sepm/article/view/1632 |
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