The paper deals with the research of the influence of thermal modification temperature of spruce wood on the electric energy consumption of its face milling. Samples of spruce wood heat treated at temperatures of 160, 180, 200 and 220°C were milled at the cutting speed of 20, 40 and 60 m.s-1, the feed rate of 6, 10 and 15 m.min-1, the rake angle of 15° with the depth of the cut of 1 mm. The energy consumption was evaluated from the cutting power, which was based on the difference during milling and idle cycle. The analysis of variance showed a decrease in cutting power with an increasing temperature of thermal modification. The average cutting power value is 137.7 W at the native sample and 80.8 W at the sample treated at 220°C. The Duncan’s test of statistical significance has shown that the thermal modification has a statistically significant effect on the cutting power values.
 Š. Barcík and T. Homola. “Effect of selected parameters on the quality of machined surface at planar milling of juvenile pine wood”, in Proceedings of the Chip and Chipless Woodworking, 2004, pp. 31-36.
 Š. Barcík and T. Rehák. Effect of selected technical, technological and material factors on the energetic efficiency at planar milling. Prague: Czech University of Life Sciences, 2009.
 C. Bengtsoon, J. Jermer, A. Clang and B. Ek-Olausson. “Investigation of some Technical Properties of Heattreated Wood”. Brisbane: International Research Group on Wood Protection, 2003.
 M.J. Boonstra, J. van Acker and A. Pizzi. “Anatomical and molecular reasons for property changes of wood after full-scale industrial heat-treatment”, in Proceedings of the Third European Conference on Wood Modification, 2007, pp. 343-358.
 J. Černecký, J. Jandačka, M. Malcho, J. Koniar and Z. Brodnianská. “Effect of the positions of directional tubing towards shaped heating surfaces on the value of local heat transfer coefficients”. JP Journal of Heat and Mass Transfer, vol. 12, no. 1, pp. 15-30, 2015.
 J. Lisičan. Theory and technique of wood working. Zvolen: MAT-CENTRUM, 2007.
 P. Koleda and M. Hrčková. “Global and Local Thresholding Techniques for Sawdust Analysis.” Acta Facultatis Technicae, vol. 23, no. 1, pp. 33-42, 2018.
 P. Koleda, Š. Barcík, M. Vančo and A. Nociarová. “Thermal Treatment and Its Effect on Energetic Efficiency of Thermal Treated Oak Wood Face Milling”. Acta Facultatis Technicae, vol. 22, no. 2, pp. 63-74, 2017.
 J. Krilek, J. Kováč and M. Kučera. “Wood cross cutting process analysis for circular saws”, BioResources, vol. 9, no. 1, pp. 1417-1429, 2014.
 J. Kubš. “Influence of Selected Factors on the Energy Performance of Flat Milling of Thermally Modified Wood”. M.A. thesis, Czech University of Life Sciences, Prague, Czech Republic, 2013.
 J. Kubš, M. Gaff and Š. Barcík. “Factors affecting the consumption of energy during the milling of thermally modified and unmodified beech wood”. BioResources, vol. 11, no. 1, pp. 736-747, 2016
 Mazáň, M. Vančo and Š. Barcík. “Influence of technological parameters on tool durability during machining of juvenile wood”. BioResources, vol. 12, no. 2, pp. 2367-2378, 2017.
 E. Miftieva. “Influence of Technical – technological and Material Factors of Planar Milling of Thermally Modified Birch Wood on Energy Performance during Shaping”. M.A. thesis, Czech University of Life Sciences, Prague, Czech Republic, 2014.
 P. Niemz, T. Hoffmann and T. Retfalvi. “Investigation of chemical changes in the structure of thermally modified wood”. Maderas Ciencia y Tecnologia, vol. 12, no. 2, pp. 69-78, 2010.
 Nociarová. “Effect of technical and technological independent parameters on energetic consumption when planar milling of heat-treated oak wood”. M.A. thesis, Technical University in Zvolen, Slovakia, 2017.
 E.L. Olteanu, C.F. Bîşu and I. Tănese. “Determination of power consumption in Milling”. U.P.B. Scientific Bulletin, vol. 75, no. 4, pp. 211-220, 2013.
 E. Pivarčiová. “Analysis of concentration fields holograms”, in Informatics and Automation in Process Control, Zvolen, 2012.
 S. Prokeš. Working of Wood and New Wood Materials. Prague: SNZL, 1982.
 L. Reinprecht and Z. Vidholdová. Thermowood – Preparation, Characteristics and Applications. Zvolen: Technical University in Zvolen, 2008.
 S. Thiede, G. Bogdanski and C. Herrmann. “A systematic method for increasing the energy and resource efficiency in manufacturing companies”, in 1st CIRP Global Web Conference: Interdisciplinary Research in Production Engineering, no. 2, 2012, pp. 18-33.
 M. Vančo, Z. Jamberová, Š. Barcík, M. Gaff, H. Čekovská and L. Kaplan. “The effect of selected technical, technological, and material factors on the size of juvenile poplar wood chips generated during face milling”. BioResources, vol. 12, no. 3, pp. 4881-4896, 2017.
 M. Vančo, A. Mazáň, Š. Barcík, L. Rajko, P. Koleda, Z. Vyhnáliková and R.R. Safin. “Impact of selected technological, technical and material factors on the quality of machined surface at face milling of thermally modified pine wood”. BioResources, vol. 12, no. 3, pp. 5140-5154, 2017.
 J. Wilkowski, M. Grześkiewicz, P. Czarniak, I. Siwek, L. Javorek and D. Pauliny. “Influence of thermal modification of oak wood on cutting forces during milling”. Annals of Warsaw University of Life Sciences – SGGW Forestry and Wood Technology, vol. 76, pp. 203-207, 2011.
 B.J. Zobel and J.R. Sprague. Juvenile Wood in Forest Trees. Berlin: Springer-Verlag, 1998.