As of May 2026 NorthWestern Energy has a market cap of NZ$7.57 Billion. This makes NorthWestern Energy the world's 3353th 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 May 3rd, 2026 the market cap of NorthWestern Energy was reported to be: