How is the national electoral register created?

Slovenia, Electoral Rights Register Act (Official Gazette of the Republic of Slovenia, No. 98/13), accessed 20 April 2022

Article 13 (Method of data management and acquisition)

OSCE Needs Assessment Report [15-18 February 2022]: “Voter registration is passive and based on the Central Population Register maintained by the Ministry of Interior (MoI). The voter register contains the voter’s constituency, district, polling station and chosen method of voting if a request to vote outside a regular polling station on election day has been declared.”