As of September 2026 NorthWestern Energy has a market cap of NZ$7.32 Billion. This makes NorthWestern Energy the world's 3522th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Sep 27th, 2026 the market cap of NorthWestern Energy was reported to be: