The bi-annual Trondheim CCS Conference series is a leading scientific CCS technology conference. Since its inception in 2003, the conference has developed to become a globally important meeting place for over 400 CCS experts. The conference typically has 150 oral presentations, five or six parallel sessions, over 100 posters and world-leading keynote speakers. The 12^th conference, TCCS-12, will build on the heritage of the previous conferences, and will be held June 19-21, 2023, in Trondheim, Norway.