ROSEBUD ENERGY CORP. 

Suite 200
 

1087 \Vest River Street
 

Boise, Idaho 83702
 

Telephone (208) 344-3570
 

Telecopier (208) 344-3984
 

March 11, 2009 

Ms. Laurel Dygowski 

U.S. Environmental Protection Agency 

Region 8 

1595 Wynkoop Street 

Denver, CO 80202-1129 

Dear Ms. Dygowski: 

I am in receipt of your letter requesting stack and emiSSion information about the 

Colstrip Energy Limited Partnership (CELP) facility located in Colstrip, Montana. I have 

gathered the data to answer your request. The data is contained in a spreadsheet 

attached to this letter. 

Please note that in some cases where there was no data available, we have estimated 

data, and have noted such estimates. 

Please contact me or Scott Siddoway at Rosebud Operating Services, Inc. (208-344­

3570 if you n fu data. 

STATEMENT OF CERTIFICATION
 

Title: 

Date: ------+---It......-....,;,--=---==---+--------_ 
1 

Requested Information Response Source Notes 

Part I: General Facility Data 

11. Name of Facility IRosebud Power Plant I I 

2. Complete street address of facility: 

a. Street Address: 18 Snider Subdivision Rd. 

b. City: Colstrip 

c. State: Montana 

d. Zip: 59323 

e. County: Rosebud County 

3. Facility Contact 

a. Name: (First, Last) Scott Siddoway 

b. Title: Engineer 

c. Telephone number: (208) 344-3570 

d. Fax number: (208) 344-3984 

e. E-mail: scott.siddoway@rosi-boise.com 

Part II: Boiler Emission Unit Data 

1. Emission Unit name: EU1 (Circulating Fluidized Bed Boiler) 

a. Type of Boiler: -­Circulating Fluidized bed Combustion 

b. Make: Tampela Keeler 2004 operating permit renewal 

c. Model: Twin Cyclone 2004 operating permit renewal 

d. Model Year -­1988 2004 operating permit renewal 

e. Year Installed: --'--_._-'­2004 operating permit renewal f----­ 1989-1990 

f. Expected Equipment life 30 Years 

~nit is currently operational: (yes/nc;» Yes 

e- if NO: 

i: Date of final operation: 

~i: Will unit be operated in future: 

h. Maximum Unit Capacity (MW gross/net): 43 MW Gross I 38 MW Net 

2. Boiler Outlet Information 

Does unit share exhaust stack? no 

Which units is it shared with? 

~_Maximum Boiler Volumetric Flow Rate (acfm): 234,257 Jan 2008 stack test 

c. Maximum Boiler outlet Temperature (F): 315 Jan 2008 stack test 

d. Boiler Exhaust Moisture (%): 9.43 Jan 2008 stack test 

~Stack Height (ft): 200' 2004 operating permit renewal 

f. Stack Diameter (ft): 8'4" 2004 operating permit renewal 

g. Maximum Hourly Gross Heat Input (MMBtu/hr): 

516 

Data from 11/20106 letter from 

DEQ to CELP 

h. Annual Hours of Operation: 8300 hours per year 

i. Design Percent Load (Capacity Factor): 95% 

j. 2001-2003 Max 24-hr avg uncontrolled PM emissions (Ib/hr): 

617.8 

Estimated fromAP-42 1.1-4 (9/98) 

~001-2003 Max 24-hr avg uncontrolled NOx emissions (Ib/hr): 

181.7 

Estimated fromAP-42 1.1-4 (9/98) 

I. 2001-2003 Max 24-hr avo uncontrolled S02 emissions (Ib/hr): 2486.1 Estimated from coal S content 
3. Existing Pollution Control Equipment 

a. PM Control Technology Information 

f----­

i. Type of PM Control Technology: 

ii. Make/Model of PM Control Technology: 

Filter Fabric Baghouse 

Brandt Environmental Corporation tiii. Year installed: 1989 

iv. Installed Cost of Control Device ($): Unknown Cost of the Baghouse was included in the cost of the boiler. Individual cost of the 

v. Direct Annual Cost of Control Device ($/yr) $120,000 per year -­ baghouse is unknown, but could be estimated if necessary. 

vi. Expected life of equipment: 30 years 

vii. Relevant sizing information: 9 cell; 272 bags/cell; 237,000acfm 2004 operating permit renewal 

viii. Design control efficiency (%) 99.6% 

ix. 2007 Average Controlled PM Emissions (Ib/hr) 3 Jan 2008 stack test January 2008 stack test was a retest of a test performed in 2007 

b. NOx Control Technology Information -­ The CFB boiler is a relatively low emitter of NOx due to a lower firing temperature 

c-­ i. Type of NOx Control Technology: CFB Boiler compared to standard pulverized coal boilers. The unit does not, however, contain any 

ii. Make/Model of NOx Control Technology n/a post-combustion control technologies. 

iii. Year installed: n/a 

iv. Installed Cost of Control Device ($): n/a 

v. Direct Annual Cost of Control Device ($/yr) n/a -­

vi. Expected life of equipment: n/a -­

vii. Relevant sizing information: n/a -­ -­ viii. Design control efficiency (%) 

IX. 2007 Average Controlled NOx Emissions (Ib/hr) 

n/a 

250lbs/hr --­

gMS-aa~ -­

--­

b. S02 Control Technology Information 

i. Type of S02 Control Technology: Limestone injection to CFB Boiler --f--­ The limestone injection control technology is a part in the operating process of the CFB 

ii. Make/Model of S02 Control Technology n/a -­f----­ -­boiler. It is not a separate "add-on" device, but it does succeed in controlling S02 

-­

iii. Year installed: 1989 1--­ __ emissions at the permitted control efficiency. 

iv. Installed Cost of Control Device ($): n/a - feature of CFB boiler 

v. Direct Annual Cost of Control Device ($/yr) $1,679,000 --1--­ --­

vi. Expected life of equipment: 30 years 

vii. Relevant sizing information: 5.5 tons/hr limestone (44,352 tons for 2007) 

-­ viii. Design control efficiency (0)0) not less than 79% 

ix. 2007 Average Controlled S02 Emissions (Ib/hr) 310lbs/hr CEMS data 

~. Fuel Information 

Based on a fuel firing rate from the 2007 PM test and the heating value from the 2002 

fuel analysis 

Average of as-received values from 2002 fuel analysis 

Based on a fuel firing rate from the 2007 PM test and the heating value from the 2002 

fuel analysis 

Average of as-received values from 2002 fuel analysis 

Average of values from 2002 fuel analysis 

List Each Type of Fuel Used: Coal and Refuse Coal 

f-­ Amount of Fuel Used (Ibs/hr) 72700 2007 PM test 

f--­ Heating Value of Fuel (Btulfb) -­

8073.3 2002 fuel analysis 

~aximum Fuel Firing Rate (ton/hr) 36.35 2007 PM test 

f-----­

Sulfur Content of Fuel (%S Wt.) 1.71%­ 2002 fuel analysis 

~h Content of Fuel (%A Wt.) 15.58% 2002 fuel analyses 

.­

Year of Data if Not 2002, reason for not using 2002 2007 for fuel firing rate, 2002 fuel firing rate -­

information not available; all others 2002 info