The Michigan Public Safety Commission studied that storm and issued orders on December 4th 2014 following a year long investigation.
The MPSC found that a large part of the storm damage was caused by falling limbs and trees — especially dead, brittle trees decimated by the invasive emerald ash borer.
Point of fact The MPSC did not order DTE to be a lot more aggressive with Tree trimming. in the December 2014 Ruling. Rather It always expects the Utilities to be aggressive in their tree trimming as seen in the use the funds allocated for that purpose. Not asking for permission was new wrinkle that as of this writing (March 8th 2015) has been rescinded in select communities.
Lansing Michigan in 2013 was served by municipal utility company governed by the Lansing Board of water and light or BWL. While the BWL is not governed or regulated by the Michigan Public Safety Commissioner, the Mayor of Lansing in December 2013, Virg Bernero invited John D. Quackenbush, the Chairman of the MPSC to serve as an advisory role in evaluating the Lansing storm in terms of readiness,and causes and corrections.
Also of note are the hazardous trees which exist outside the utilities right of way and came tumbling down in the ice storm of 2013.