DTE Energy updates a map of power outages in its service area every half hour. Look at this map for power outage details for Ann Arbor, Ypsilanti, and surrounding areas:

http://my.dteenergy.com/map/outage.html

If you have interruptable air conditioning service, here's the status page for predicting if your air will be interrupted

http://my.dteenergy.com/products/interruptibleLearn.html

This map from the Midwest ISO shows loading of the grid across the Midwest, to help get a sense for whether power problems are or could be transmission related or grid-wide.

http://www.midwestiso.org/page/LMP+Contour+Map+&+Data

In the news

• April 25 2009: Storms go north of Washtenaw County, hit Livingston, Oakland, St Clair; 140000 customers out system wide. Power outage is worst in Oakland County includes links from the daily Oakland Press.
• May 28 2008: Auger hits power line on Broadway Street construction site, 3000 out for up to 2.5 hours. Ann Arbor News coverage quotes DTE spokesman Len Singer.
• Aug 23 2007: at 815 pm 100-1000 out in each of several zips in Livingston Co, 100-1000 out in Dexter
• Aug 1 2007; 1,000 still out in Pittsfield Township. http://blog.mlive.com/annarbornews/2007/08/some_pittsfield_residents_stil.html "Northwest Ann Arbor residents reported partial outages known as "brown-outs" from Tuesday night into this morning. Spokesman Scott Simons said DTE does not track partial outages."
• Aug 1 2007: 4,700 out in Pittsfield Township, tree trimming accident; http://blog.mlive.com/annarbornews/2007/08/tree_trimmer_knocks_out_power.html