Changes to 1999/23/EC: Council Decision of 14 December 1998 adopting a multiannual programme to promote international cooperation in the energy sector (1998-2002)
EU Decision 1999/23
No changes to 1999/23/EC: Council Decision of 14 December 1998 adopting a multiannual programme to promote international cooperation in the energy sector (1998-2002) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.