The international Scientific Electric Power Conference held annually at the Institute of Energy and Transport System, Peter the Great Saint Petersburg Polytechnic University, has created a platform for summarizing research in the technical fields of knowledge in higher educational institutions, research institutes, large industrial enterprises, research and production associations and individual scientists. The aim of the conference is to contribute to informing scientists and practitioners about the most promising areas of research and achievements in the field of electric power industry.The present proceedings include the selected papers of the ISEPC-2019, which took place in St. Petersburg, Russia, on 23rd and 24th of May, 2019. This installment of the conference has focused generally on the discussion of the modern achievements of scientists, the possibilities and problems of developments implementations to improve the energy efficiency and reliability of electrical systems. More than 100 scientists from Europe, Asia and America took part in the Conference. 70 oral reports and more than 30 poster presentations were made. The key topics included in the proceedings are as follows:– Electrical Technology– Power Stations– Electrical Power Transmission and Distribution– Energy Storage– Electrical Machines and Devices– Power Electronics– Operation of Electrical Power System– Control of Electrical Power System– Power System Protection– Diagnostics and Maintenance– Reliability and Safety– Smart grids– Information Systems– Renewable energy– Energy efficiency.We would like to thank everyone who was part of this conference and look forward to seeing everyone again next year at ISEPC 2020 dedicated to the 100 year anniversary of the USSR electrification plan.Conference Chairs.On behalf of the ISEPC Conference Committee,prof. N.V. Korovkin and prof. V.Ya. Frolov,Peter the Great St. Petersburg Polytechnic University.List of Oral Presentations, Poster Session, A guided tour of key laboratories and research centers and images are available in this pdf.