A book entitled: “Flexitranstore Special Session in the 21st International Symposium on High Voltage Engineering (ISH 2019)” has been published by Springer, including the papers that were presented during the special session of the FLEXITRANSTORE project in the ISH 2019 Conference. The book is open access and you may find it by following the link: https://link.springer.com/book/10.1007/978-3-030-37818-9