BISMARCK, N.D. (Prairie Public Radio) – A number of wind farms in North Dakota have asked for an extension – or a waiver – of the state requirement that they must have a new lighting system – called ADLS, or “Aircraft Detection Lighting System.”

That replaces the constantly blinking red beacon lights, so that the lights are only on when an aircraft is in the area.

The deadline for installing the system is December 31st. The Public Service Commission says 8 facilities have asked for an extension of that deadline. One has asked for a waiver, because of concerns raised by the Minot Air Force Base. Two facilities have received extension, and one has been granted a waiver.

Commissioner Brian Kroshus says the Public Service Commission will be considering the extensions and waivers on a case-by-case basis.

Seven other wind farms had an earlier date to install ADLS systems, and did so by December 31st, 2019.