Otter Tail is negotiating to sell DMI for $20m and expects to close the transaction no later than 3 January, 2013. Michael J. Olsen, senior vice president of corporate communications, declined to name the potential buyer or say if it was a foreign company.

“We are actively negotiating with someone now,” he says. Its plant in West Fargo, North Dakota, employs 216 workers with another 167 at its Tulsa, Oklahoma, facility.

Otter