Financial Results Conference Calls and Webcasts

• February 13, 2020 - Year End 2019
• April 23, 2020 - '20 Quarter 1
• July 29, 2020 - '20 Quarter 2
• October 22, 2020 - '20 Quarter 3 - Tentative

Dividend Payment Date

• March 31, 2020 (March 13 record date)
• June 30, 2020 (June 15 record date)
• September 30, 2020 (September 15 record date)
• December 31, 2020 (December 15 record date)

Conferences and Events

• March 3-4, 2020
  BAML Power, Utilities & Renewables Investor Conference
  Boston, MA

• March 18-19, 2020
  Siebert Williams Shank & Co West Coast Utilities Conference
  Las Vegas, NV

• March 26, 2020
  Sidoti Small Cap Conference
  New York, NY

• May 14, 2020
  Credit Suisse Clean Tech Virtual Conference

• May 17-19, 2020
  AGA Financial Forum

May 28, 2020
Bank of America Merrill Lynch Mini Conference - Virtual

• November 8-10, 2020
  EEI Financial Conference
  Phoenix, AZ
  

Annual Stockholders Meeting

• April 23, 2020 (February 28 Record Date)
  10:00 a.m. Mountain Daylight Time
  NorthWestern Energy MT Operational Support Office
  11 East Park Street
  Butte, Montana 59701