Exhibit 99.1 AEP, CSW Extend Merger Agreement (Note: This is a press release issued jointly by AEP and CSW on Dec. 16.) AEP, CSW AMEND MERGER AGREEMENT TO EXTEND TERM FOR AN ADDITIONAL SIX MONTHS Columbus, Ohio, and Dallas, Texas (Dec. 16, 1999) --...CSW Extend Merger Agreement • December 17th, 1999 • West Texas Utilities Co • Electric services
Columbus, Ohio, and Dallas, Texas (Dec. 16, 1999) -- American Electric Power and Central and South West Corp. have mutually agreed to amend the agreement for the pending merger of the two companies to extend its term. This will allow additional time to satisfy the closing conditions contained in the agreement. This amendment to the merger agreement, approved by the boards of directors of each company, requires that AEP and CSW gain final approvals before June 30, 2000. The original merger agreement listed a Dec. 31, 1999 deadline.
