Development of Net-Zero Emission Olive Oil Mills in the Island of Crete, Greece
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Olive oil industry is one of the main industries in the island of Crete, Greece. Olive oil is extracted in around 550 small-size olive oil mills in the island. These olive oil mills are characterized by low energy consumption utilizing grid electricity for powering the machinery and solid biomass for heat generation. Olive oil mills can generate in situ the electricity required in their operation while the can use olive kernel wood, produced in olive pomace plants, for heat production. Replacement of grid electricity with solar electricity generated by a solar photovoltaic system and using olive-based biomass for heating purposes an olive oil mill can eliminate all the net-carbon emissions during its operation. Solar photovoltaics systems are broadly used in Crete for green power generation while olive-based solid biomass is extensively used for heat production. Αn olive oil mill producing annually around 200 tons of olive oil can eliminate all the operational carbon emissions with the installation of a solar photovoltaic system with nominal capacity 13.33 kWp and with the use of 9,524 kg/year of olive kernel wood for heat production. Our work indicates that the use of reliable, mature and cost-efficient renewable energies in olive oil mills in Crete can achieve their complete decarbonization. The results could be useful to olive oil mills’ owners and to policy makers who can promote the decarbonization of the main food industry in the island.
Garcia Martin, J.F., Cuevas, M., Feng, C-H., Mateos, P.A., Torres Garcia, M. & Sanchez, S. (2020). Energetic valorization of olive biomass: Olive tree pruning, olive stones and pomace, Processes, 8, 511. doi:10.3390/pr8050511
Romaniello R., Perone C., Berardi A., Leone A. & Tamborrino A. (2024). Biomass Recovery from Olive Oil Extraction Line: Opportunities for Reuse of By-products and Energy Saving, Chemical Engineering Transactions, 109, 25-30.
DOI:10.3303/CET24109005
Sintori, A., Konstantidelli, V., Gouta, P. & Tzouramani, I. (2023). Profitability, Productivity, and Technical Efficiency of Cretan Olive Groves across Alternative Ecological Farm Types, Agriculture, 13, 2194.
https://doi.org/10.3390/agriculture13122194
Skoulou, V., Zabaniotou, A., Stavropoulos, G., & Sakelaropoulos, G. (2008). Syngas production from olive tree cuttings and olive kernels in a downdraft fixed-bed gasifier. International Journal of Hydrogen Energy, 33(4), 1185-1194. https://doi.org/10.1016/j.ijhydene.2007.12.051
Alharbi, A. & Ghonimy, M. (2025). Environmental Benefits of Olive By-Products in Energy, Soil, and Sustainable Management, Sustainability, 17, 4722. https://doi.org/10.3390/su17104722
Di Mario, J., Ranucci, A., Gambelli, A.M., Rallini, M., Priolo, D., Brienza, M., Puglia, D., Del Buono, D. & Gigliotti, G. (2025). Biogas Production from Olive Oil Mill Byproducts: A Comparative Study of Two Treatments for Pursuing a Biorefinery Approach, Agriculture, 15, 2204.
https://doi.org/10.3390/agriculture15212204
Aguado, R., Vera, D., Jurado, F. & Beltran, G. (2025). An integrated gasification plant for electric power generation from wet biomass: towards a sustainable production in the olive oil industry, Biomass Conversion and Biorefinery, 15, 29893-29912.https://doi.org/10.1007/s13399-021-02231-0
Vourdoubas, J. (2017). Possibilities of energy generation from olive tree residues, by-products and waste in Crete, Greece, Journal of Agricultural Studies, 5(4), 110-122. doi:10.5296/jas.v5i4.12114
Cappelletti, G.M., Iopollo, G., Nicoletti, G.M. & Russo, C. (2014). Energy requirement of extra virgin olive oil production, Sustainability, 6, 4966-4974. https://doi.org/10.3390/su6084966
Baptista, F., Silva, L.L., Murcho, D. Sagarna, J. et al. (2014). Energy efficiency in olive oil mills. Available from:
https://www.researchgate.net/publication/303766686_Energy_efficiency_in_olive_oil_mills
Baptista, F., Silva, L.L., Murchio, D., Sagarna, J. et al. (2016). Energy efficiency in olive oil mills. Available from:
https://www.researchgate.net/publication/303766686_Energy_efficiency_in_olive_oil_mills
Sanchez-Jimenez, J.L., Munoz-Rodriguez, F.J., Jimenez- Castillo, G., Martinez-Calahorro, A.J. & Rus-Casas, C. (2024). Analysis of Different Scenarios to Include PV Rooftop Systems with Battery Energy Storage Systems in Olive Mills, Energies, 17, 144.
https://doi.org/10.3390/en17010144
Jimenez-Castillo, G., Munoz-Rodriguez, F.J., Martinez-Calaborro, A.J. et al. (2020). Impacts of array orientation and tilt angles for photovoltaic self-sufficiency and self-consumption indices in olive mills in Spain, Electronics, 9, 348.
https://doi.org/10.3390/electronics9020348
Rabaza, O., Contreras-Montes, J., Espin-Estrella,A. & Gomez-Lopente, D. (2015). Model to maximize self-consumption of olive mills powered by a mixed system of renewable energies, International Conference on Renewable Energies and Power Quality, La Coruna, Spain, 25-27 March, 2015. Available from:
https://icrepq.com/icrepq%2715/263-15-rabaza.pdf
Cinardi, G., D’ Urso, P.R. & Arcidiacono, C. (2025). Integrating Rooftop Grid-Connected Photovoltaic and Battery Systems to Reduce Environmental Impacts in Agro-Industrial Activities with a Focus on Extra Virgin Olive Oil Production, Clean Technology, 7, 91.
https://doi.org/10.3390/ cleantechnol7040091
The first zero-impact olive mill to produce energy, 2016. Available from:
https://www.oliveoiltimes.com/world/first-zero-impact-olive-mill-produce-energy/53172
Marquina, J., Colinet, M.J. & Del. P. Pablo-Romero, M. (2021). The economic value of olive sector biomass for thermal and electrical uses in Andalusia, Spain, Renewable and Sustainable Energy Reviews, 148, 111278.
DOI: 10.1016/j.rser.2021.111278
Perone, C., Romaniello, R., Leone, A., Berardi, A. & Tamborrino, A. (2022). Towards energy efficient scheduling in the olive oil extraction industry: comparative assessment of energy consumption in two management models, Energy Conversion and Management X, 16, 100287.
https://doi.org/10.1016/j.ecmx.2022.100287
Baptista, F., Silva, L.L. & Fitas da Cruz, V. (2023). Energy efficiency in the olive groves and in olive oil mills. Available from:
Vourdoubas, J. (2016). Possibilities of creating zero CO2 emission olive pomace plants due to energy use in Crete, Greece, Open Journal of Energy Efficiency, 5, 78-87.
DOI: 10.4236/ojee.2016.53008
Cini, E., Recchia, L., Daou, M. & Boncinelli, P. (2008). Human health benefits and energy saving in olive oil mills, International Conference “Innovation Technology to Empower Safety, Health and Welfare in Agriculture and Agrifood Systems”, September 15-17, 2008, Ragusa, Italy. Available from:
https://www.academia.edu/127647586/Human_health_benefits_and_energy_saving_in_olive_oil_mills
Murcho, D., Baptista, F., Silva, L.L. & Silva, J.R. (2016). Best practices for improving energy efficiency in Olive Oil Mills. Available from: https://live-blog-jornada-tesla.chil.me/download-file/036fe5cd-2d96-4368-a446-45527aa5925a/
Genk, S., Bozcurt, E. & Yildirim, N. (2016). Zero energy olive oil production plant design by using waste valorization, in Heiselberg, P. K. (Ed.) (2016). CLIMA 2016 - proceedings of the 12th REHVA World Congress: volume 3. Aalborg: Aalborg University, Department of Civil Engineering.
Available from:
Nikolaidis A. Production and marketing of Cretan olive oil and wine. In: van der Ploeg J. (ed.). Strengthening endogenous development patterns in European agriculture. Chania : CIHEAM, 1993, p. 233-243 (Options Méditerranéennes: Série A. Séminaires Méditerranéens; n. 23).
Charalampopoulos, I., Droulia, F., Mavridi, A. & Roussos, P.A. (2025). Mapping the Climatic Suitability for Olive Groves in Greece, Agronomy, 15, 2604.
https://doi.org/10.3390/agronomy15112604
Moran-Alarcon, L.C., Galan,-Martin, A., del Mar Contreras, M. & Castro, E. (2026). Recent advances and future perspectives in the valorization of olive biomass for sustainable biorefinery applications, Renewable and Sustainable Energy Reviews, 226, 116438. https://doi.org/10.1016/j.rser.2025.116438
Sánchez-Lozano, D., Escámez, A., Aguado, R., Oulbi, S., Hadria, R. & Vera, D. (2023). Techno-Economic Assessment of an Off-Grid Biomass Gasification CHP Plant for an Olive Oil Mill in the Region of Marrakech-Safi, Morocco, Applied Sciences, 13, 5965.
https://doi.org/10.3390/app13105965
Polonio, D., Gomez-Limon, J.A., La Cal, J.A. & Villanueva A.J. (2024). The circular bioeconomy of the olive oil industry: Deterministic and probabilistic profitability of olive mill by-product gasification, Biomass and Bioenergy, 189, 107350. https://doi.org/10.1016/j.biombioe.2024.107350
Mouzakitis, Y. & Adamides, E.D. (2022). Techno-Economic Assessment of an Olive Mill Wastewater (OMWW) Biorefinery in the Context of Circular Bioeconomy, Eng, 3, 488–503.
