Exhibit 21-A

OTTER TAIL CORPORATION

Subsidiaries of the Registrant

February 19, 2021

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