HELENA, Mont. -

NorthWestern Energy is asking the Montana Public Service Commission to approve a $10.9 million natural gas rate increase for its customers.
   
PSC officials say it is the company's first gas rate case since 2012.
   
Chairman Brad Johnson said in a statement Monday that the commission will be thorough and judicious in considering the request.
   
NorthWestern officials say a typical residential customer using 100 therms per month would see a 6.77 percent bill increase under the rate hike.