NorthWestern Energy Group Inc
NorthWestern Energy Group Inc (NWE) Historical Volatility
NWE 30-day historical volatility is 18%. This ranks in the 12th percentile of readings over the past year.
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Tracking NWE historical volatility helps you see how much NorthWestern Energy Group Inc's stock price has actually moved over past periods, giving you a baseline to judge whether current option premiums are fair, cheap, or expensive. While implied volatility tells you what the market expects, NorthWestern Energy Group Inc's HV tells you what really happened. Use our scanner to monitor NWE 30 day historical volatility alongside longer lookback windows and spot the moments when realized and implied diverge.
Historical volatility is the annualized standard deviation of an underlying's past returns, typically measured over rolling windows like 10, 20, 30, or 60 days. The NWE 30 day historical volatility is one of the most widely watched readings because it balances responsiveness with stability. Comparing NorthWestern Energy Group Inc's HV to its implied volatility reveals the volatility risk premium — when IV sits well above HV, option sellers tend to have an edge; when HV runs hot relative to IV, buyers may be underpaying for movement.
NorthWestern Corporation, doing business as NorthWestern Energy, provides electricity and natural gas to residential, commercial, and various industrial customers. The company operates through Electric and Natural Gas segments. It generates, purchases, transmits, and distributes electricity; and produces, purchases, stores, transmits, and distributes natural gas, as well as owns municipal franchises to provide natural gas service in the communities. The company operates 6,819 miles of electric transmission and 18,177 miles of electric distribution lines with approximately 400 transmission and distribution substations; and 2,166 miles of natural gas transmission and 4,945 miles of natural gas distribution lines with approximately 138 city gate stations in Montana.
It also operates 1,308 miles of electric transmission and 2,320 miles of electric distribution lines in South Dakota; and 55 miles of natural gas transmission and 2,517 miles of natural gas distribution lines in South Dakota and Nebraska. The company serves approximately 753,600 customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. NorthWestern Corporation was incorporated in 1923 and is based in Sioux Falls, South Dakota.
Sizing a long premium trade, modeling a covered call, or hunting volatility arbitrage all come back to one question: how much has the stock actually moved? Our scanner puts NorthWestern Energy Group Inc's historical volatility side-by-side with implied readings across every lookback window, so you can see exactly where NWE HV is running hot, cold, or in line. Make the NWE 30 day historical volatility — and every other window — work for your edge instead of against it.
As of September 23, 2026
As of September 23, 2026
See how volatility has moved over time
Track NWE historical volatility, spot where IV and realized volatility diverge, and find options that are priced in your favor right now.
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