Beginning in August, TSA will allow current TWIC cardholders whose TWIC cards expire on or before Dec. 31, 2014, to pay $60 and make one trip to an enrollment center. Cardholders will call the TWIC help desk at 1-866-DHS-TWIC (347-8942). Once their card is ready, they can pick the card up at an enrollment center.
See also:
TWIC: Licensed Hazmat Truckers Can Skip a Background Check, Save Money
Why is the TWIC So Expensive?