ALLETE to Announce First Quarter Financial Results on May 2

DULUTH, Minn.–(BUSINESS WIRE)–ALLETE, Inc. (NYSE:ALE) will announce its financial results for the
first quarter before the stock markets open on Wednesday, May 2, 2018.

Following the release, ALLETE Chairman, Chief Executive Officer and
President Alan R. Hodnik, Senior Vice President and Chief Financial
Officer Robert J. Adams, and Vice President, Controller and Chief
Accounting Officer Steven W. Morris will present an overview of results
and discuss other factors affecting performance during a conference call
beginning at 10 a.m. Eastern time.

Interested parties may listen to the conference live by calling (877)
303-5852, or by accessing the webcast on ALLETE’s Web site, www.allete.com.

A replay of the call will be available through May 6, 2018 by dialing
(855) 859-2056, pass code 2193327. The webcast will be accessible for
one year at www.allete.com.

ALLETE is an energy company headquartered in Duluth, Minn. In addition
to its electric utilities, Minnesota Power and Superior Water, Light and
Power of Wisconsin, ALLETE owns ALLETE Clean Energy, based in Duluth,
BNI Energy in Bismarck, N.D., U.S. Water Services headquartered in St.
Michael, Minn., and has an eight percent equity interest in the American
Transmission Co. More information about ALLETE is available at www.allete.com.
ALE-CORP

Contacts

ALLETE, Inc.
Investor Contact:
Vince Meyer,
218-723-3952
[email protected]