 BUTTE, Mont. and SIOUX FALLS, S.D., April 05, 2021 GLOBE NEWSWIRE -- NorthWestern Corporation dba NorthWestern Energy Nasdaq: NWE today announced that it will host an investor conference call and webinar on Thursday, April 22, 2021, at 3:00 p.m. Eastern Daylight Time to review its financial results for the quarter ending March 31, 2021. The Company also plans to issue a news release detailing its first quarter financial results the evening of April 21, 2021, after stock market close. 