0000921895-16-004022 SC 13D/A 1 20160407 20160406 ATLANTIC POWER CORP 0001419242 4900 550886410 A1 1231 SC 13D/A 34 005-87139 161558636 3 ALLIED DRIVE SUITE 220 DEDHAM MA 02026 617-977-2400 3 ALLIED DRIVE SUITE 220 DEDHAM MA 02026 MANGROVE PARTNERS 0001535392 980652572 E9 1231 SC 13D/A 645 MADISON AVENUE, 14TH FLOOR NEW YORK NY 10022 212-897-9535 645 MADISON AVENUE, 14TH FLOOR NEW YORK NY 10022 SC 13D/A 1 sc13da108511007_04062016.htm AMENDMENT NO. 1 TO THE SCHEDULE 13D