AUT Journal of Electrical Engineering

AUT Journal of Electrical Engineering

From Sun and Wind to Thermal Comfort: A Techno-Economic Optimization Framework for Renewable Electrification of Heating and Cooling in Iran

Document Type : Research Article

Authors
1 Department of Power Systems Operation and Planning Research, Niroo Research Institute (NRI), Tehran, Iran.
2 Department of Smart Control Systems Research, Niroo Research Institute (NRI), Tehran, Iran.
Abstract
This study develops an optimization-based planning model for the deployment of renewable energy resources to meet electrified space heating and cooling demands. The model integrates building heat transfer characteristics, renewable energy potentials, and electricity transmission network constraints. Its objective is to minimize total investment and operational costs of generation, storage, and transmission, while capturing seasonal variability in supply and demand. The framework also evaluates the effects of finer temporal resolution and multiple operational periods through scenario-based simulations. Heating and cooling demands are estimated using degree-day metrics combined with building thermal transfer equations, assuming full electrification by renewable sources. Two strategies for heating electrification are investigated: assigning a predetermined share to each province, and optimizing the spatial distribution of electrification across provinces to meet overall targets. The model is applied to real-world data from Iran, which features diverse climates and substantial solar and wind potential. Results suggest widespread deployment of solar PV across most provinces, while wind development is concentrated in eastern regions such as Khorasan. Sensitivity analysis on storage system costs shows a balanced solar-wind combination when the storage prices is in the range $100-150/kWh. For the prices below or above this range respectively the solar or wind power plants dominate the generation mix. Transmission network expansion is most beneficial in provinces that serve as renewable hubs or major demand centers, though local supply is generally prioritized. Overall, findings indicate that the priority of heating electrification projects varies significantly among provinces, highlighting the importance of spatially differentiated planning strategies.
Keywords
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[1]        P. R. White, J. D. Rhodes, E. J. H. Wilson, and M. E. Webber, “Quantifying the impact of residential space heating electrification on the Texas electric grid,” Applied Energy, vol. 298, p. 117113, 2021, doi: 10.1016/j.apenergy.2021.117113.
[2]        A. Khosravani, M. DeHaan, B. W. Billings, and K. M. Powell, “Electrification of residential and commercial buildings integrated with hybrid renewable energy systems: A techno-economic analysis,” Energy, vol. 302, p. 131893, 2024, doi: 10.1016/j.energy.2024.131893.
[3]        S. S. Salim, S. L. Luxembourg, F. Dalla Longa, and B. van der Zwaan, “From retrofitting to renewables: navigating energy transition pathways for European residential space heating,” Energies, vol. 17, no. 10, p. 2363, 2024, doi: 10.3390/en17102363.
[4]        N. Sandoval et al., “Achieving equitable space heating electrification: A case study of Los Angeles,” Energy and Buildings, vol. 317, p. 114422, 2024, doi: 10.1016/j.enbuild.2024.114422.
[5]        N. J. Hewitt, “Electrification of Heating—Requirements for Successful Wide‐Scale Deployment,” Wiley Interdisciplinary Reviews: Energy and Environment, vol. 13, no. 6, p. e542, 2024, doi: 10.1002/wene.542.
[6]        H. Farzaneh and M. Dashti, “Integrated modeling framework for optimizing energy demand in high energy intensive industries of Iran,” in 2010 IEEE International Energy Conference, IEEE, 2010, pp. 780–784.
[7]        B. Forough, N. Norouzi, and M. Fani, “Investigation of the optimal model for the development of renewable energy in Iran using a Robust Optimization Approach,” World Journal of Electrical and Electronic Engineering, vol. 1, no. 1, pp. 1–20, 2021.
[8]        M. Rezaei Mirghaed and Y. Saboohi, “Optimal design of renewable integrated heat and electricity supply systems with genetic algorithm: Household application in Iran,” International Journal of Environmental Science and Technology, vol. 17, no. 4, pp. 2185–2196, 2020.
[9]        S. Ahmadi-Kaliji, A. Hajinezhad, A. K. Lotfabadi, R. Fattahi, and S. F. Moosavian, “Energy modeling to compensate for the seasonal lack of electrical and thermal energy depending on the different climates of Iran,” Heliyon, vol. 9, no. 10, 2023.
[10]      M. Khazaee, R. Zahedi, R. Faryadras, and A. Ahmadi, “Potential assessment of renewable energy resources and their power plant capacities in Iran,” Glob J Ecol, vol. 7, no. 2, pp. 060–071, 2022.
[11]      H. Yousefi, M. H. Ghodusinejad, and A. Ghodrati, “Multi-criteria future energy system planning and analysis for hot arid areas of Iran,” Energies, vol. 15, no. 24, p. 9405, 2022.
[12]      S. M. Hashemi, M. Sheibani, M. H. Nazari and F. Fallahi, “A Hybrid Physics–Machine Learning Framework for Allocating Electrified Heating Demand across Power Networks”, Accessed: Nov. 24, 2025. [Online]. Available: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5686278
[13]      A. Noori, B. Tavassoli, and A. Fereidunian, “Distributionally Robust Joint Chance-Constrained Optimization for Electricity Imbalance in Iran: Integrating Renewables and Storage,” arXiv preprint arXiv:2409.00367, 2024.
[14]      S. M. Hashemi, B. Alizadeh, M. Sheibani, and F. Fallahi, “Assessing Potential of Renewable Energy Sources in Iran through Practical and Analytical Data,” in 2023 13th Smart Grid Conference (SGC), IEEE, 2023, pp. 1–8. Accessed: Jun. 08, 2024. [Online]. Available: https://ieeexplore.ieee.org/abstract/document/10459316/
[15]      M. Rouhandeh, A. Ahmadi, M. Mirhosseini, and R. Alirezaei, “Economic energy supply using renewable sources such as solar and wind in hard-to-reach areas of Iran with two different geographical locations,” Energy Strategy Reviews, vol. 55, p. 101494, 2024.
[16]      M. Sharifian, H. Khajehpour, and A. H. F. Khorasani, “Assessing the GHG mitigation pathways in the Iran energy supply system,” in 2024 9th International Conference on Technology and Energy Management (ICTEM), IEEE, 2024, pp. 1–5.
[17]      S. M. Hashemi, M. Tabarzadi, F. Fallahi, M. R. N. Kalhori, D. Abdollahzadeh, and M. Qadrdan, “Water and emission constrained generation expansion planning for Iran power system,” Energy, vol. 288, p. 129821, 2024.
[18]      H. Fazlollahtabar, “Sustainable renewable energy supply chain with current technological adaptation: Macro energy progress policy in Iran,” Environmental Progress & Sustainable Energy, vol. 43, no. 5, p. e14433, 2024.
[19]      A. H. Slocum and D. J. Gessel, “Evolving from a hydrocarbon-based to a sustainable economy: Starting with a case study for Iran,” Renewable and Sustainable Energy Reviews, vol. 154, p. 111750, 2022.
[20]      A. A. Majd, E. Farjah, and M. Rastegar, “Composite generation and transmission expansion planning toward high renewable energy penetration in Iran power grid,” IET Renewable Power Generation, vol. 14, no. 9, pp. 1520–1528, 2020.
[21]      O. Ayadi and S. Al-Dahidi, “Comparison of solar thermal and solar electric space heating and cooling systems for buildings in different climatic regions,” Solar Energy, vol. 188, pp. 545–560, 2019.
[22]      E. Assareh, M. Assareh, S. M. Alirahmi, S. Jalilinasrabady, A. Dejdar, and M. Izadi, “An extensive thermo-economic evaluation and optimization of an integrated system empowered by solar-wind-ocean energy converter for electricity generation–Case study: Bandar Abas, Iran,” Thermal Science and Engineering Progress, vol. 25, p. 100965, 2021.
[23]      H. Yousefi, A. Kargarzadeh, F. Javanshir, and M. Montazeri, “Optimizing Energy Consumption of Buildings Using Vertical Ground Source Heat Pumps (Case study: Tehran province),” 2022.
[24]      J.-K. Kim, H. Park, S. Kim, J. Lee, Y. Song, and S. C. Yi, “Optimization models for the cost-effective design and operation of renewable-integrated energy systems,” Renewable and Sustainable Energy Reviews, vol. 183, p. 113429, 2023.
[25]      A. F. Alirezaei and M. A. Bijarchi, “Thermodynamic and economic analysis of a novel solar-driven integrated cooling, heating, power, and desalination unit for vertical farming system,” Energy, p. 135927, 2025.
[26]      S. Dibos, T. Pesch, and A. Benigni, “HeatNetSim: An open-source simulation tool for heating and cooling networks suitable for future energy systems,” Energy, vol. 312, p. 133588, 2024.
[27]      M. Yuan et al., “Renewable energy and waste heat recovery in district heating systems in China: A systematic review,” Energy, p. 130788, 2024.
[28]      M. Berger, B. Schroeteler, H. Sperle, P. Püntener, T. Felder, and J. Worlitschek, “Assessment of residential scale renewable heating solutions with thermal energy storages,” Energy, vol. 244, p. 122618, 2022.
[29]      T. Yang, W. Liu, and G. J. Kramer, “Seasonal thermal energy storage employing solar heat: A case study of Heilongjiang, China, exploring the transition to clean heating and renewable power integration,” Energy, vol. 305, p. 132334, 2024.
[30]      S. P. Mirhoseini and S. M. Hashemi, “A novel approach for battery energy storage systems expansion planning in distribution network,” Journal of Energy Storage, vol. 138, p. 118565, 2025.
[31]      T. Novosel, F. Feijoo, N. Duić, and J. Domac, “Impact of district heating and cooling on the potential for the integration of variable renewable energy sources in mild and Mediterranean climates,” Energy conversion and management, vol. 272, p. 116374, 2022.
[32]      L. Herc, A. Pfeifer, F. Feijoo, and N. Duić, “Energy system transitions pathways with the new H2RES model: a comparison with existing planning tool,” e-Prime-Advances in Electrical Engineering, Electronics and Energy, vol. 1, p. 100024, 2021.
[33]      S. M. Hashemi, H. Arasteh, M. Shafiekhani, M. Kia, and J. M. Guerrero, “Multi-objective operation of microgrids based on electrical and thermal flexibility metrics using the NNC and IGDT methods,” International Journal of Electrical Power & Energy Systems, vol. 144, p. 108617, 2023.
[34]      H. Arasteh et al., “A System-of-Systems Planning Platform for Enabling Flexibility Provision at Distribution Level,” in Flexibility in Electric Power Distribution Networks, CRC Press, pp. 41–65.
[35]      S. Pfenninger and I. Staffell, “Long-term patterns of European PV output using 30 years of validated hourly reanalysis and satellite data,” Energy, vol. 114, pp. 1251–1265, 2016.
[36]      I. Staffell and S. Pfenninger, “Using bias-corrected reanalysis to simulate current and future wind power output,” Energy, vol. 114, pp. 1224–1239, 2016.
[37]      R. J. De Dear and G. S. Brager, “Thermal comfort in naturally ventilated buildings: revisions to ASHRAE Standard 55,” Energy and buildings, vol. 34, no. 6, 2002, Accessed: Aug. 23, 2025. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0378778802000051
[38]      P. Orouji, R. Hajian, M. Moradi, S. Mohaghegh, K. Keynejad, and M. Sefidgar, “Atlas of heating: Identifying regional climate-dependent heat demands in residential buildings of Iran,” Build. Simul., vol. 14, no. 3, pp. 857–869, Jun. 2021, doi: 10.1007/s12273-020-0717-z.