| SC 13G/A | 2015-02-10 | VANGUARD GROUP INC | DTE ENERGY CO | 13,778,313 | 7.8% | EDGAR |
| SC 13G/A | 2015-01-26 | BlackRock Inc. | DTE ENERGY CO | 13,775,011 | 7.8% | EDGAR |
| SC 13G/A | 2014-02-12 | VANGUARD GROUP INC | DTE ENERGY CO | 12,375,061 | 7.0% | EDGAR |
| SC 13G | 2014-02-05 | STATE STREET CORP | DTE ENERGY CO | - | 4.9% | EDGAR |
| SC 13G/A | 2014-01-28 | BlackRock Inc. | DTE ENERGY CO | 13,247,298 | 7.5% | EDGAR |
| SC 13G/A | 2013-02-11 | VANGUARD GROUP INC | DTE ENERGY CO | 11,379,052 | 6.6% | EDGAR |
| SC 13G | 2013-02-11 | STATE STREET CORP | DTE ENERGY CO | - | 5.1% | EDGAR |
| SC 13G/A | 2013-02-06 | BlackRock Inc. | DTE ENERGY CO | 11,672,303 | 6.8% | EDGAR |
| SC 13G/A | 2012-02-13 | BlackRock Inc. | DTE ENERGY CO | 11,210,159 | 6.6% | EDGAR |
| SC 13G | 2012-02-09 | STATE STREET CORP | DTE ENERGY CO | - | 5.4% | EDGAR |
| SC 13G/A | 2012-02-08 | VANGUARD GROUP INC | DTE ENERGY CO | 9,865,669 | 5.8% | EDGAR |
| SC 13G | 2011-02-10 | VANGUARD GROUP INC | DTE ENERGY CO | 8,960,922 | 5.3% | EDGAR |
| SC 13G/A | 2011-02-02 | BlackRock Inc. | DTE ENERGY CO | 10,217,308 | 6.0% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | DTE ENERGY CO | 12,391,748 | 7.5% | EDGAR |
| SC 13G/A | 2009-10-21 | DTE ENERGY CO | PLUG POWER INC | 791,745 | 0.6% | EDGAR |
| SC 13G | 2009-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | DTE ENERGY CO | 4,864,831 | 3.0% | EDGAR |
| SC 13G/A | 2008-02-14 | DTE ENERGY CO | PLUG POWER INC | 8,225,227 | 9.4% | EDGAR |
| SC 13G | 2008-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | DTE ENERGY CO | 3,422,510 | 2.1% | EDGAR |
| SC 13G/A | 2008-02-04 | FRANKLIN RESOURCES INC | DTE ENERGY CO | 7,221,322 | 4.4% | EDGAR |
| SC 13G/A | 2007-02-12 | CAPITAL RESEARCH & MANAGEMENT CO | DTE ENERGY CO | 8,500,000 | 4.8% | EDGAR |