EX-21 7 a2024ex21subsidiariesofreg.htm EX-21
Exhibit 21
OTTER TAIL CORPORATION
Subsidiaries of the Registrant
February 19, 2025

Company | State of Organization
BTD Manufacturing, Inc. | Minnesota
Northern Pipe Products, Inc. | North Dakota
Otter Tail Assurance Limited | Cayman Islands
Otter Tail Power Company | Minnesota
T.O. Plastics, Inc. | Minnesota
Varistar Corporation | Minnesota
Vinyltech Corporation | Arizona