0000905718-16-001196 SC 13G/A 1 20160216 20160216 ATLANTIC POWER CORP 0001419242 4900 550886410 A1 1231 SC 13G/A 34 005-87139 161428277 3 ALLIED DRIVE SUITE 220 DEDHAM MA 02026 617-977-2400 3 ALLIED DRIVE SUITE 220 DEDHAM MA 02026 12 West Capital Management LP 0001540531 453076594 DE 1231 SC 13G/A 90 PARK AVENUE 41ST FLOOR NEW YORK NY 10016 646-216-7040 90 PARK AVENUE 41ST FLOOR NEW YORK NY 10016 SC 13G/A 1 atlanticpower13gam1dec2015.htm AMENDMENT NO. 1