EX-21.A 3 ex_171880.htm EXHIBIT 21.A

Exhibit 21-A

OTTER TAIL CORPORATION

Subsidiaries of the Registrant

February 20, 2020

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