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• Review article

  Recent advances in solid oxide cell technology for electrolysis

  Hauch, A., Küngas, R., Blennow, P., Hansen, A. B., Hansen, J. B., Mathiesen, B. V. & Bjerg Mogensen, M., 2020, In : Science. 370, 6513, eaba6118.

  Research output: Contribution to journal › Review article › peer-review

  • Regenerative fuel cells
  • Electrolysis
  • Oxides
  • Synthetic fuels
  • Ethers
  3 Citations (Scopus)

• Smart energy and smart energy systems

  Lund, H., Østergaard, P. A., Connolly, D. & Mathiesen, B. V., 15 Oct 2017, In : Energy. 137, p. 556-565

  Research output: Contribution to journal › Review article › peer-review

  • Electricity
  • Heating
  • Cooling
  • Industry
  278 Citations (Scopus)

• Sustainable and cost-efficient energy supply and utilisation through innovative concepts and technologies at regional, urban and single-user scales

  Piacentino, A., Duic, N., Markovska, N., Mathiesen, B. V., Guzović, Z., Eveloy, V. & Lund, H., 1 Sep 2019, In : Energy. 182, p. 254-268 15 p.

  Research output: Contribution to journal › Review article › peer-review

  • Costs
  • Waste heat utilization
  • Environmental impact
  • Sustainable development
  • Heating
  9 Citations (Scopus)

• The status of 4th generation district heating: Research and results

  Lund, H., Østergaard, P. A., Chang, M., Werner, S., Svendsen, S., Sorknæs, P., Thorsen, J. E., Hvelplund, F., Mortensen, B. O. G., Mathiesen, B. V., Bojesen, C., Duic, N., Zhang, X. & Möller, B., 1 Dec 2018, In : Energy. 164, p. 147-159 13 p.

  Research output: Contribution to journal › Review article › peer-review

  Open Access

  File

  • District heating
  • Costs
  • Heating
  • Hot Temperature
  143 Citations (Scopus)

  13 Downloads (Pure)
• Report chapter

  The role of fuel cells and electrolysers in future efficient energy systems

  Hendriksen, P. V., Mathiesen, B. V., Pedersen, A. S. & Linderoth, S., Nov 2012, DTU International Energy Report 2012: Energy efficiency improvements: A key element in the global transition to non-fossil energy. Hvidtfeldt Larsen, H. & Sønderberg Petersen, L. (eds.). Technical University of Denmark (DTU), p. 95-101

  Research output: Contribution to book/anthology/report/conference proceeding › Report chapter › Research › peer-review

  File
  454 Downloads (Pure)
• Report

  Afledte virkninger af kombineret kommunal og statslig støtte til energimoderniseringsprojekter

  Sperling, K., Mathiesen, B. V. & Hvelplund, F. K., 25 Sep 2015, Institut for Planlægning, Aalborg Universitet. 20 p. (ISP-Skriftserie; No. 2015-3).

  Research output: Book/Report › Report › Research

  Open Access

  File
  558 Downloads (Pure)

• Applications of SOECs in different types of energy systems: German and Danish case studies

  Mathiesen, B. V., Ridjan, I., Hansen, K., Connolly, D. & Wunsch, J-H., Aug 2015, Department of Development and Planning, Aalborg University. 35 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • energy
  • electrokinesis
  • electricity
  • intermediate product
  • nuclear energy
  954 Downloads (Pure)

• A review of biomass gasification technologies in Denmark and Sweden

  Ridjan, I., Mathiesen, B. V. & Connolly, D., Nov 2013, Department of Development and Planning, Aalborg University. 32 p.

  Research output: Book/Report › Report › Research

  File

  • gasification
  • biomass
  • project
  • research and development
  • alternative energy
  7095 Downloads (Pure)

• A Review of Smart Energy Projects & Smart Energy State-of-the-Art

  Mathiesen, B. V., Drysdale, D., Chozas, J. F., Ridjan, I., Connolly, D. & Lund, H., 21 Dec 2015, Department of Development and Planning, Aalborg University. 146 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • state of the art
  • project
  • energy
  • electricity
  • electric vehicle
  5769 Downloads (Pure)

• Biogas utilisation in the energy system and market potential for biogas methanation

  Skov, I. R., David, A., Mathiesen, B. V. & Sorknæs, P., Aug 2019, Department of Planning, Aalborg University. 41 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • biogas
  • market
  • cost
  • methane
  • energy
  59 Downloads (Pure)

• Business Cases and Business Strategies to Encourage Market Uptake: Addressing Barriers for the Market Uptake of Recommended Heating and Cooling Solutions - Heat Roadmap Europe 4

  Trier, D., Kowalska, M., Paardekooper, S., Volt, J., De Groote, M., Krasatsenka, A., Popp, D., Beletti, V., Nowak, T., Rothballer, C., Stiff, G., Terenzi, A. & Mathiesen, B. V., 2018, PlanEnergi s/i. 45 p.

  Research output: Book/Report › Report › Communication

  Open Access

  File

  • market
  • cooling
  • heating
  • Europe
  • policy
  774 Downloads (Pure)

• Case descriptions: Appendix report to the Hotmaps handbook for strategic heat planning

  Djørup, S. R., Bertelsen, N., Mathiesen, B. V. & Schneider, N. C. A., 16 Apr 2019, Aalborg Universitet. 36 p.

  Research output: Book/Report › Report › Research

  File
  214 Downloads (Pure)

• CEEH Videnskabelig rapport nr. 10: CEEH’s beregning af helbredsomkostninger fra luftforurening i Klimakommissionens fremtidsforløb

  Karlsson, K., Ystanes Føyn, T. H., Gregg, J. S., Kaspersen, P. S., Brandt, J., Frohn, L. M. & Mathiesen, B. V., 2011, CEEH - Center for Energy, Environment and Health. 24 p. (Centre for Energy, Environment and Health Report series; No. 10).

  Research output: Book/Report › Report › Research › peer-review

  File
  243 Downloads (Pure)

• Coherent Energy and Environmental System Analysis

  Lund, H. (ed.), Hvelplund, F., Mathiesen, B. V., Østergaard, P. A., Christensen, P., Connolly, D., Schaltz, E., Pillay, J. R., Nielsen, M. P., Felby, C., Bentsen, N. S., Tonini, D., Astrup, T., Meyer, N. I., Heussen, K., Lind, M., Morthorst, P. E., Møller Andersen, F., Münster, M., Hansen, L-L. P. & 5 others, Wenzel, H., Hamelin, L., Karlsson, K. B., Munksgaard, J. & Karnøe, P., 2011, Aalborg: Department of Development and Planning, Aalborg University. 91 p.

  Research output: Book/Report › Report › Research

  Open Access

  • systems analysis
  • alternative energy
  • energy
  • project
  • research institution

• Copenhagen Energy Vision: A sustainable vision for bringing a Capital to 100% renewable energy

  Mathiesen, B. V., Lund, R. S., Connolly, D., Ridjan, I. & Nielsen, S., Mar 2015, Department of Development and Planning, Aalborg University. 125 p.

  Research output: Book/Report › Report › Research

  File

  • alternative energy
  • energy supply
  • energy
  • electricity
  • recommendation
  8538 Downloads (Pure)

• Danish roadmap for large-scale implementation of electrolysers

  Skov, I. R. & Mathiesen, B. V., Mar 2017, Copenhagen: Department of Development and Planning, Aalborg University. 41 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • electrokinesis
  • alternative energy
  • energy
  • electricity
  • need
  2414 Downloads (Pure)

• Definition & Experiences of Strategic Heat Planning: Handbook I

  Djørup, S. R., Bertelsen, N., Mathiesen, B. V. & Schneider, N. C. A., 16 Apr 2019, 35 p.

  Research output: Book/Report › Report › Research

  Open Access

  File
  271 Downloads (Pure)

• Framework conditions and public regulation for wind turbines in the Øresund Region

  Hansen, K., Mathiesen, B. V. & Connolly, D., Sep 2011, 11 p.

  Research output: Book/Report › Report › Research

  File
  208 Downloads (Pure)

• Future Green Buildings: A Key to Cost-Effective Sustainable Energy Systems

  Mathiesen, B. V., Drysdale, D., Lund, H., Paardekooper, S., Ridjan, I., Connolly, D., Thellufsen, J. Z. & Jensen, J. S., May 2016, Department of Development and Planning, Aalborg University.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • green building
  • savings
  • alternative energy
  • energy production
  • cost
  8097 Downloads (Pure)

• Guidance for the comprehensive assessment of efficient heating and cooling

  Djørup, S. R., Bertelsen, N., Mathiesen, B. V. & Schneider, N. C. A., 16 Apr 2019, Aalborg Universitet. 23 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • energy efficiency
  • cooling
  • heating
  • district heating
  • cogeneration
  266 Downloads (Pure)

• Guidelines for the Energy System Transition: Recommendations for Local and Regional Policymakers - Heat Roadmap Europe 4

  Trier, D., Sørensen, S. S., Rothballer, C., Stiff, G. & Mathiesen, B. V., 2018, PlanEnergi s/i. 55 p.

  Research output: Book/Report › Report › Communication

  Open Access

  File

  • recommendation
  • Europe
  • transition
  • carbon
  • energy
  686 Downloads (Pure)

• Guidelines for the Energy System Transition: The Energy Union Perspective - Heat Roadmap Europe

  Trier, D., Rothballer, C., Stiff, G. & Mathiesen, B. V., 2018, PlanEnergi s/i. 45 p.

  Research output: Book/Report › Report › Communication

  Open Access

  File

  • Europe
  • transition
  • energy
  • economic policy
  • policy
  517 Downloads (Pure)

• Guidelines for the Energy System Transition: The National Aspects of the HRE 2050 Scenario and Associated Policy Recommendations - Heat Roadmap Europe 4

  Trier, D., Kowalska, M., Rothballer, C., Stiff, G. & Mathiesen, B. V., 2018, PlanEnergi s/i. 81 p.

  Research output: Book/Report › Report › Communication

  Open Access

  File

  • recommendation
  • Europe
  • transition
  • policy
  • energy
  471 Downloads (Pure)

• Guidelines for the Energy System Transition: Recommendations for Policymakers Including the Local and Regional Approach, the National Aspects and the Energy Union Perspective - Heat Roadmap Europe 4

  Trier, D., Kowalska, M., Sørensen, S. S., Rothballer, C., Stiff, G. & Mathiesen, B. V., 2018, PlanEnergi s/i. 185 p.

  Research output: Book/Report › Report › Communication

  Open Access

  File

  • recommendation
  • Europe
  • transition
  • energy
  • economic policy
  480 Downloads (Pure)

• Handlingsplan for storskala anvendelse af elektrolyse i Danmark

  Skov, I. R. & Mathiesen, B. V., Oct 2018, 46 p.

  Research output: Book/Report › Report › Research

  Open Access

  File
  1487 Downloads (Pure)

• Heat Roadmap Austria: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  868 Downloads (Pure)

• Heat Roadmap Belgium: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  1143 Downloads (Pure)

• Heat Roadmap Chile: Quantifying the potential of clean district heating and energy efficiency for a long-term energy vision for Chile

  Paardekooper, S., Chang, M., Nielsen, S., Moreno, D., Lund, H., Grundahl, L., Dahlbæk, J. & Mathiesen, B. V., Nov 2019, Department of Develpment and Planning, Aalborg University. 112 p.

  Research output: Book/Report › Report › Research

  File
  134 Downloads (Pure)

• Heat Roadmap Czech Republic: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  652 Downloads (Pure)

• Heat Roadmap Europe: Inputs for Technical Modelling and Policy Recommendations

  Connolly, D., Mathiesen, B. V., Lund, H., Møller, B., Hvelplund, F. K., Sperling, K., Østergaard, P. A. & Werner, S., Jul 2015, 34 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • district heating
  • recommendation
  • Europe
  • policy
  • heat pump
  611 Downloads (Pure)

• Heat Roadmap Europe 1: First Pre-Study for the EU27

  Connolly, D., Mathiesen, B. V., Østergaard, P. A., Möller, B., Nielsen, S., Lund, H., Trier, D., Persson, U., Nilsson, D. & Werner, S., May 2012, 101 p.

  Research output: Book/Report › Report › Research

  Open Access

  File
  3779 Downloads (Pure)

• Heat Roadmap Europe 2: Second Pre-Study for the EU27

  Connolly, D., Mathiesen, B. V., Østergaard, P. A., Möller, B., Nielsen, S., Lund, H., Persson, U., Werner, S., Grözinger, J., Boermans, T., Bosquet, M. & Trier, D., 27 May 2013, Department of Development and Planning, Aalborg University. 222 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • district heating
  • Europe
  • local heat supply
  • savings
  • heat pump
  9689 Downloads (Pure)

• Heat Roadmap Europe 3 (STRATEGO): Translating the Heat Roadmap Europe Methodology to Member State Level

  Connolly, D., Hansen, K., Drysdale, D., Lund, H., Mathiesen, B. V., Werner, S., Persson, U., Møller, B., Wilke, O. G., Bettgenhäuser, K., Pouwels, W., Boermans, T., Novosel, T., Krajačić, G., Duić, N., Trier, D., Møller, J. D., Odgaard, A. M. & Jensen, L. L., Jun 2015, Department of Development and Planning, Aalborg University. 550 p.

  Research output: Book/Report › Report › Research

  Open Access

  • energy efficiency
  • heating
  • Europe
  • methodology
  • cooling

• Heat Roadmap Europe 4: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, Aalborg Universitetsforlag. 97 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • natural gas
  6643 Downloads (Pure)

• Heat Roadmap Finland: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  480 Downloads (Pure)

• Heat Roadmap France: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  773 Downloads (Pure)

• Heat Roadmap Germany: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  1673 Downloads (Pure)

• Heat Roadmap Hungary: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  476 Downloads (Pure)

• Heat Roadmap Italy: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  848 Downloads (Pure)

• Heat Roadmap Netherlands: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  908 Downloads (Pure)

• Heat Roadmap Poland: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  782 Downloads (Pure)

• Heat Roadmap Romania: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  534 Downloads (Pure)

• Heat Roadmap Spain: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 50 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  923 Downloads (Pure)

• Heat Roadmap Sweden: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 50 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  755 Downloads (Pure)

• Heat Roadmap United Kingdom: Quantifying the Impact of Low-Carbon Heating and Cooling Roadmaps

  Paardekooper, S., Lund, R. S., Mathiesen, B. V., Chang, M., Petersen, U. R., Grundahl, L., David, A., Dahlbæk, J., Kapetanakis, I. A., Lund, H., Bertelsen, N., Hansen, K., Drysdale, D. W. & Persson, U., 5 Oct 2018, 52 p.

  Research output: Book/Report › Report › Research › peer-review

  Open Access

  File

  • cooling
  • heating
  • Europe
  • carbon
  • demand
  954 Downloads (Pure)

• IDA's Energy Vision 2050: A Smart Energy System strategy for 100% renewable Denmark

  Mathiesen, B. V., Lund, H., Hansen, K., Ridjan, I., Djørup, S. R., Nielsen, S., Sorknæs, P., Thellufsen, J. Z., Grundahl, L., Lund, R. S., Drysdale, D., Connolly, D. & Østergaard, P. A., Nov 2015, Department of Development and Planning, Aalborg University. 164 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • energy
  • resource efficiency
  • plan
  • energy storage
  • electricity
  18136 Downloads (Pure)

• IDAs Klimasvar: Transport- og energiløsninger 2030

  Lund, H., Mathiesen, B. V., Thellufsen, J. Z., Sorknæs, P. & Skov, I. R., May 2020, Ingeniørforeningen IDA. 64 p.

  Research output: Book/Report › Report › Research

  Open Access

  File
  1204 Downloads (Pure)

• Landvindmøllernes lokale økonomiske effekter i Billund Kommune

  Sperling, K. & Mathiesen, B. V., Jul 2015, Aalborg Universitet. 27 p. (ISP-Skriftserie; No. 2015-1).

  Research output: Book/Report › Report › Research

  Open Access

  File
  667 Downloads (Pure)

• Limerick Clare Energy Plan: Climate Change Strategy

  Connolly, D., Mathiesen, B. V., Dubuisson, X., Lund, H., Ridjan, I., Finn, P. & Hodgins, J., Jun 2012, 160 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • plan
  • climate change
  • energy
  • alternative energy
  • transition
  988 Downloads (Pure)

• Limerick Clare Energy Plan: Energy and Emissions Balance 2010 and 2020

  Connolly, D., Mathiesen, B. V., Dubuisson, X., Hansen, K., Lund, H., Finn, P. & Hodgins, J., Jun 2012, 112 p.

  Research output: Book/Report › Report › Research

  Open Access

  File

  • energy balance
  • alternative energy
  • plan
  • energy
  • top-down approach
  822 Downloads (Pure)