September 11, Ms. Kavita Kale Executive Secretary Michigan Public Service Commission 7109 West Saginaw Hwy Lansing, MI 48917

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1 DTE Gas Company One Energy Plaza, WCB Detroit, MI 8-79 David S. Maquera () -7 September, 8 Ms. Kavita Kale Executive Secretary Michigan Public Service Commission 79 West Saginaw Hwy Lansing, MI 897 Re: In the matter of the Application of DTE Gas Company for approval of a Gas Cost Recovery Plan, -year Forecast and Monthly GCR Factor for the months ending March, 9 MPSC Case No. U-8 Dear Ms. Kale: Attached for electronic filing in the above-referenced case is DTE Gas Company s Contingent Factor Data and Determination for the October 8 Contingent Factor Period. Also attached is a Proof of Service. Very truly yours, DSM/lah Attachments cc: Service List David S. Maquera

2 DTE Gas Company Contingent Factor Data and Determination 8-9 GCR Plan Period Case No. U-8 NYMEX Natural Gas Contract Closing Prices Line Close Date 9//8 9//8 9//8 9/7/8 9//8 -Day Avg. (Col. ) (Col. ) (Col. ) (Col. ) (Col. ) (Col. ) January (Close) $.9 February (Close) $.99 March (Close) $ 7 April (Close) $.7 May (Close) $.7 June (Close) $.9 7 July (Close) $.9 8 August (Close) $.78 9 September (Close) $.9 October $ $.79 $.77 $.77 $ $.79 November $ $ $.79 $.79 $ 8 $ 9 December '8 $.97 $.97 $ 8 $ 78 $ 9 $.9 January $ 7 $.99 $.97 $.9 $.98 $.989 February $.99 $.9 $.9 $.97 $.9 $.99 March $ 9 $ $ $ $ $ April $ $ $.8 $.8 $.9 $.9 7 May $.8 $.7 $.9 $.7 $.7 $.7 8 June $ $ $.88 $.87 $ $.99 9 July $ 8 $ 7 $ 8 $ 8 $ $ August $ $ $ $ $ $ September $ $ $ $ $ $ October $ 8 $ $ $ $ $ November $ 97 $ 87 $ 9 $ 9 $ 79 $ 8 December '9 $ $ $.79 $.79 $ $ $.78 Averages Jan 8 - Dec 9 Sept Day $.78 X plan $.9 7 Difference $ (.) 8 Incremental CF $ - Oct Maximum GCR Factor 9 Current GCR Factor $ Incremental CF $ - Total GCR Factor $

3 Tuesday, September, 8 NYMEX October gas futures jump. cents on storage concerns The NYMEX October gas futures contract settled at $.9/MMBtu Friday, up. cents on storage build concerns ahead of the withdrawal season. The front-month contract traded between $8/MMBtu and $.9/MMBtu. Today is a reasonably strong day for gas. The day before a threeday weekend is not a period of high activity, said Alan Levine, chairman and CEO of brokerage PowerHouse, in a phone call Friday. The -cent jump [in morning trading] is a pretty good declaration that the market is making a significant rally ahead of beginning winter with a significant deficit even though we had a reasonably robust injection report [Thursday], he said. The 7-Bcf injection for the week ended August, announced by the US Energy Information Administration, did little to close the storage gap. Current national gas stocks sit at. Tcf, a 9% deficit to the five-year average of 9 Tcf. If these injection rates continue, we will wind up with a substantial deficit, Levine said. The opening of $7/MMBtu and closing of $7/MMBtu Thursday, the first day of October as the front-month contract was a serious indication of a strong degree of uncertainty in the market, Levine said. The upward movement in prices Friday came despite lower temperatures dampening demand. S&P Global Platts Analytics estimated total US demand to drop by Bcf to 77. Bcf Friday. Demand is estimated to average 79. Bcf/d over the next seven days. Much of the demand decline was due to drop in power burn in the Northeast and the Southeast region as temperatures return to normal from the extremes seen earlier in the week. Power burn is estimated to stand at.7 Bcf Friday, a drop of.9 Bcf day on day, Platts Analytics data showed. Power burn demand is projected to pick up and average. Bcf/d over the next seven days. Veda Chowdhury NYMEX Henry Hub gas futures contract, Aug settlement High Low +/- Volume Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 7. Jan Feb Mar 7. Apr.... May Jun.... Jul.... Aug.... Sep Oct.... Nov Dec Jan 9.9 Feb Mar Apr....9 May....9 Jun....9 Jul Aug Sep Contract data for Thursday Volume of contracts traded: 9,7 Oct,,7; Nov, 97,9; Dec,.7 Total open interest:,, May -May 7-Jun -Jun -Jul -Jul -Aug -Aug - -, Custom Weather -7 Aug-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

4 Wednesday, September, 8 NYMEX October gas futures lower after production hits record high over weekend NYMEX October gas futures dropped 9. cents Tuesday, as record production over the weekend put downward pressure on the market. The front-month contract settled at $/MMBtu Tuesday, after trading in a range of $-$.9/MMBtu on Tuesday. US dry gas production reached a record high over the long Labor Day Weekend, increasing to 8. Bcf/d Sunday. It has decreased to 8. Bcf/d Tuesday, according to S&P Global Platts Analytics. Total demand including exports to Mexico and LNG exports decreased by 7 MMcf/d on the day to 7.8 Bcf/d Tuesday. Deliveries to the Sabine Pass terminal drove the US drop, falling close to MMcf/d, according to Platts Analytics. Overall, the supply-demand balance has grown recently as record production continued and demand backed off. This can possibly drive storage injections higher as summer months come to an end. The bearish sentiment continued Tuesday, with power burn totals in the Midwest falling MMcf/d to Bcf/d, according to Platts Analytics. Looking ahead, the NYMEX winter strip averaged approximately $.9/MMBtu on Tuesday as the market does not seem bothered by the storage deficit going into the winter months and as strong production seems to be deemed sufficient to take care of approaching demand. All the bearish factors hampered the market, as the front-month contract reached its lowest levels since the beginning of August. The front-month contract has not broken $/MMBtu since June as strong dry gas production has kept a lid on the market. Looking ahead, the most recent six- to -day temperature forecast from the National Weather Service calls for higher-thanaverage temperatures for much of the country, excluding the Pacific Northwest, which will put upward pressure on the market. Arsalan Syed NYMEX Henry Hub gas futures contract, Sep settlement High low +/- Volume Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Contract data for Monday Volume of contracts traded:,87 Oct,,; Nov,,8; Dec,. Total open interest:,7, May -May 8-Jun -Jun -Jul -Jul -Aug -Sep - -, Custom Weather -7 Sep-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

5 Thursday, September, 8 NYMEX October gas futures settles cents lower on high supply, falling demand The NYMEX October natural gas futures contract settled at $.79/MMBtu Wednesday, down cents, on rising supply and falling demand. The front-month contract traded between $.78/MMBtu and $/MMBtu Wednesday. The bearish sentiment is a result of the rising supply, said Kyle Cooper, an analyst/principal at IAF Advisors. US dry gas production continues to be at elevated levels despite sliding to 8. Bcf Wednesday, down.7 Bcf from Tuesday, after averaging 8. Bcf/d over the Labor Day weekend, according to S&P Global Platts Analytics estimates. This is the first time production has dropped below 8 Bcf in the past 9 days. Production stood at 7. Bcf the same day a year ago. Platts Analytics estimates production will climb to 8. Bcf over the next week, the data showed. Total demand Wednesday was 78. Bcf, down MMcf day on day, Platts Analytics showed, as higher power burns in Texas and the Southwest helped offset dropping power burn in the Upper Midwest as temperatures returned to seasonal norms. Demand is set to slide further, averaging 77. Bcf/d over the next seven days, likely because of mild temperatures during the shoulder months, Platts Analytics data showed. The market is counting way too much on the availability of gas and discounting the low storage level, Cooper said. Prices may rise Thursday as the market expects a lower storage build compared with the five-year average of Bcf. A consensus of analysts that Platts surveyed expects a -Bcf injection for the week that ended August, down Bcf from the 7-Bcf build the US Energy Information Administration announced for the week that ended August. Veda Chowdhury NYMEX Henry Hub gas futures contract, Sep settlement High Low +/- Volume Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug 9 -. Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan -. Feb Mar Apr May Jun Jul Aug Sep Contract data for Tuesday Volume of contracts traded:,9 Oct,,; Nov,,9; Dec,.79 Total open interest:,, May -May -Jun 7-Jun -Jul -Aug 7-Aug -Sep - -, Custom Weather -7 Sep-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

6 Friday, September 7, 8 NYMEX October gas settles. cents lower as storage report meets market expectations The NYMEX October natural gas futures contract settled at $.77/MMBtu Thursday, down. cents, with a weekly storage build report within market expectations. The front-month contract traded between $.7/MMBtu and $.797/MMBtu. The US Energy Information Administration estimated a -Bcf injection for the week that ended Friday, largely in line with the consensus of analysts S&P Global Platts surveyed and near the fiveyear average of Bcf. The storage build puts national gas stocks at.8 Tcf, down % from year-ago levels of. Tcf and at an 8.7% deficit to the five-year average of.8 Tcf. The weak pricing environment also may be from a slide in power burn across much of the US. Power burn demand dropped Bcf Thursday to. Bcf after averaging 7.9 Bcf in the past two days, according to S&P Global Platts Analytics. More than half of the decline came from the Upper Midwest, which fell. Bcf Thursday, followed by the Northeast and the Southeast regions, where power burn slid.7 Bcf and. Bcf, respectively, the data showed. These declines were largely from temperatures normalizing after lingering above normal in the past few days. Platts Analytics estimates power burn to fall further, averaging.9 Bcf/d over the next seven days. Power burn demand averaged. Bcf/d since October became the front month,. Bcf higher than the 9.7 Bcf/d during the same period a year ago. Production slid for the second straight day to 8. Bcf Thursday, down 7 MMcf from the day prior, according to Platts Analytics data. Over the past days, output has averaged 8.7 Bcf/d, up from 7. Bcf/d for the same time period in 7. Looking ahead, production is estimated to tick up, averaging 8. Bcf over the next seven days, keeping supply elevated and putting pressure on prices. Veda Chowdhury NYMEX Henry Hub gas futures contract, Sep settlement High Low +/- Volume Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May....7 Jun....7 Jul....7 Aug Sep Contract data for Wednesday Volume of contracts traded:,778 Oct,,7; Nov, 9,8; Dec,. Total open interest:,8, May -May -Jun 8-Jun 7-Jul -Aug -Aug -Sep - -, Custom Weather -7 Sep-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

7 Monday, September, 8 NYMEX October gas futures slightly up despite dropping demand The NYMEX October gas futures contract settled at $.77/MMBtu Friday, up. cent despite declining demand due to mild temperatures. The front-month contract traded between $.79/MMBtu and $.78/MMBtu. Prices fell pretty dramatically in the week as heat recorded in early September was not strong as the forecast, said Daniel Myers, market analyst at Gelber & Associates. The front-month contract settled at $/MMBtu Tuesday and continued to weaken on falling demand. Total demand is estimated to drop by. Bcf to 77.9 Bcf Friday, according to S&P Global Platts Analytics. Demand averaged 79.8 Bcf/d over the past three days. Over the next seven days, demand is projected to further drop and average 7.8 Bcf/d, putting a downward pressure on prices. Milder temperatures caused power burn estimates to drop to Bcf Friday, down. Bcf day on day. Over the past three days, power burn surged due to above-normal temperatures across much of the country, and averaged 7. Bcf/d, Platts Analytics data showed. The majority of the drop, roughly. Bcf, came from the Northeast, followed by the Upper Midwest, Texas and Southeast. Platts Analytics estimates power burn to trend downwards as the shoulder season progresses and average Bcf/d over the next seven days. On the supply side, US dry gas production is estimated to decline to 8 Bcf, a drop of MMcf on the day. Platts Analytics estimates production to rebound and average 8. Bcf/d over the next two weeks. Although storage continues to be at a 9% deficit to the five-year average of.8 Tcf, according to US Energy Information Administration data, weak prices for the winter contracts suggest that the market is confident that elevated production levels will likely offset winter demand. The December contract settled at $78/MMBtu, down.7 cent, while the January contract was settled at $.9/MMBtu, shedding.9 cent on day. Veda Chowdhury NYMEX Henry Hub gas futures contract, Sep 7 settlement High Low +/- Volume Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct 9 9. Nov Dec Jan Feb -. 8 Mar Apr May Jun Jul Aug.... Sep.... Oct..8.. Nov Dec Jan. Feb Mar Apr....7 May Jun Jul Aug Sep Contract data for Thursday Volume of contracts traded: 7,7 Oct,,; Nov, 9,8; Dec,.7 Total open interest:,9, May -May -Jun 9-Jun 8-Jul -Aug -Aug 7-Sep - -, Custom Weather -7 Sep-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

8 Tuesday, September, 8 NYMEX October gas futures settles cents higher despite bearish weather forecast The NYMEX October gas futures contract settled at $/MMBtu Monday, up cents, despite a bearish weather forecast. The front-month contract traded between $.7/MMBtu and $/MMBtu. Similar gains were seen in the November and December contracts, with November contract settling at $8/MMBtu, a gain of.8 cents, and December contract settling at $9/MMBtu, a rise of.7 cents. The weather forecast is bearish, leaving the market to track back and forth, said Kyle Cooper, analyst at IAF Advisors. The National Weather Service calls for a likelihood of above-average temperatures for much of October, driving down early heating demand. Prices likely are getting support from a deficit in US natural gas storage stocks. Current inventories stand at.8 Tcf, nearly 9% below the.8 Tcf five-year average. Total demand fell nearly Bcf from Friday, according to S&P Global Platts Analytics data. Demand is estimated to stand at 7. Bcf Monday, then climb to average 77. Bcf/d, with the most recent six- to -day forecast calling for a likelihood of warmer-than-average weather for much of the country. Demand is likely to see some impact from Hurricane Florence. The storm, which is on its way to the Southeast coast, is expected to bring heavy rain and wind to the Carolinas as early as Wednesday and through early Friday. The most recent trajectory of the storm suggests demand impact largely across North Carolina, South Carolina and possibly up into Virginia, Platts Analytics data showed. Dry gas production picked up over the weekend to average 8. Bcf/d, according to Platts Analytics data. Production is estimated to fall MMcf to stand at 8 Bcf Monday and stay relatively flat over the next two weeks. In September so far, output has averaged 8 Bcf/d, up Bcf from year-ago levels of 7 Bcf/d. Veda Chowdhury NYMEX Henry Hub gas futures contract, Sep settlement High low +/- Volume Oct Nov Dec Jan Feb Mar 9. 7 Apr May Jun Jul 9. Aug 9. Sep Oct 9. 9 Nov Dec Jan Feb 7.8 Mar Apr May Jun Jul Aug..9.. Sep.... Oct....9 Nov Dec Jan.9 Feb Mar Apr....9 May....9 Jun Jul Aug Sep Contract data for Friday Volume of contracts traded:,97 Oct, 7,; Nov,,9; Dec,.8 Total open interest:,,89. -May 9-May -Jun -Jul 9-Jul -Aug -Aug -Sep - -, Custom Weather -7 Sep-8 8 S&P Global Platts, a division of S&P Global Inc. All rights reserved.

9 STATE OF MICHIGAN BEFORE THE MICHIGAN PUBLIC SERVICE COMMISSION In the matter of the Application of ) DTE GAS COMPANY for approval of a ) Gas Cost Recovery Plan, -year Forecast ) Case No. U-8 and Monthly GCR Factor for the months ) ending March, 9 ) STATE OF MICHIGAN ) ) ss. COUNTY OF WAYNE ) PROOF OF SERVICE ESTELLA BRANSON, being duly sworn, deposes and says that on the th day of September, 8, she served a copy of DTE Gas Company s Contingent Factor Data and Determination for the October 8 Contingent Factor Period, via electronic mail upon the persons on the attached service list. Subscribed and sworn to before me this th day of September, 8. ESTELLA BRANSON Lorri A. Hanner, Notary Public Wayne County, Michigan My Commission Expires: -- Acting in Wayne County

10 SERVICE LIST MPSC CASE NO. U-8 ADMINISTRATIVE LAW JUDGE Hon. Martin D. Snider 79 W. Saginaw Hwy. Lansing, MI 897 ATTORNEY GENERAL (ENRA) Michael Moody G. Mennen Williams Bldg. W. Ottawa Street, th Floor P.O. Box 7 Lansing, MI 899 moodym@michigan.gov ag-enra-spec-lit@michigan.gov MICHIGAN ENVIRONMENTAL COUNCIL (MEC) Christopher M. Bzdok Tracy Jane Andrews Lydia Barbash-Riley Olson, Bzdok & Howard, P.C. E. Front St. Traverse City, MI 98 chris@envlaw.com tjandrews@envlaw.com lydia@envlaw.com karla@envlaw.com kimberly@envlaw.com RESIDENTIAL CUSTOMER GROUP Brian W. Coyer Don L. Keskey University Office Place Albert Avenue, Suite East Lansing, MI 88 bwcoyer@publiclawresourcecenter.com donkeskey@publiclawresourcecenter.com RETAIL ENERGY SUPPLY ASSOCIATION (RESA) Jennifer Utter Heston Fraser Trebilcock Davis & Dunlap, PC W. Allegan, Suite Lansing, MI 89 jheston@fraserlawfirm.com MICHIGAN PUBLIC SERVICE COMMISSION STAFF ATTORNEYS Monica M. Stephens Heather M. S. Durian 79 West Saginaw Hwy, rd Floor Lansing, MI 897 stephensm@michigan.gov durianh@michigan.gov