OTTR - Otter Tail Corp (OTTR) Q1 2021 Earnings Call Transcript May, 04 2021 11:00 PM Otter Tail Corporation Image source: The Motley Fool. Otter Tail Corp (NASDAQ: OTTR) Q1 2021 Earnings Call May 4, 2021 , 11:00 a.m. ET Operator Continue reading For further details see: Otter Tail Corp (OTTR) Q1 2021 Earnings Call Transcript