Montana Dakota Utilities Co. has filed for a natural gas rate increase.
The utility is asking for an overall 6.4 percent increase. For residential customers, the increase would be 9.5 percent.
"For a residential custimer, it would be about $5.15 a month," said MDU spokesman Mark Hanson. "What we're looking to do is recover costs for quite a bit of investment in our natural gas facilities, as well as technology upgrades."
Hanson says some of those upgrades benefit customers directly.