See "Pending" under this "Tariff" section of the website for additional revised or new tariff sheets that Northern has on file with the Commission. Tariff sheets denoted as "Substitute" are sheets filed in compl iance with a FERC order and Northern is currently operating in accordance with the provisions on such Substitute sheets.

Index of Current Sheets
Sheet Effective Date
First Revised Sheet No. 0 February 25, 2006
Eleventh Revised Sheet No. 1 February 15, 2009
Thirteenth Revised Sheet No. 2 August 1, 2007
Ninth Revised Sheet No. 3 October 1, 2007
Ninth Revised Sheet No. 6 June 16, 2003
Fifth Revised Sheet No. 7 October 22, 2001
First Revised Sheet No. 8 October 1, 2007
Original Sheet No. 12 November 1, 1993
First Revised Sheet No. 20 October 1, 2007
Second Revised Sheet No. 21 April 17, 2010
Original Sheet No. 22 November 1, 1993
First Revised Sheet No. 25 August 16, 2010
Third Revised Sheet No. 26 April 17, 2010
First Revised Sheet No. 27 November 1, 1993
Original Sheet No. 40 November 1, 1993
79 Revised Sheet No. 50 April 1, 2010
80 Revised Sheet No. 51 April 1, 2010
43 Revised Sheet No. 52 April 1, 2010
83 Revised Sheet No. 53 April 1, 2010
1 Revised 35 Revised Sheet No. 54 September 1, 2010
Eighth Revised Sheet No. 54A April 17, 2010
Sixth Revised Sheet No. 54B April 17, 2010
12 Revised Sheet No. 55 November 1, 2006
Original Sheet No. 55A June 1, 2008
3 Revised 20 Revised Sheet No. 56 September 24, 2006
Sheet No. 57 November 1, 2000
33 Revised Sheet No. 59 October 1, 2009
17 Revised Sheet No. 59A October 1, 2009
38 Revised Sheet No. 60 April 1, 2010
18 Revised Sheet No. 60A April 1, 2010
28 Revised Sheet No. 61 April 1, 2010
1 Revised 30 Revised Sheet No. 62 September 1, 2010
28 Revised Sheet No. 63 November 1, 2008
27 Revised Sheet No. 64 November 1, 2008
Second Revised Sheet No. 65 August 16, 2010
52 Revised Sheet No. 66 November 1, 2009
56 Revised Sheet No. 66A December 1, 2009
23 Revised Sheet No. 66B February 3, 2010
17 Revised Sheet No. 66B.01 October 1, 2009
14 Revised Sheet No. 66B.01a May 1, 2010
Sixth Revised Sheet No. 66B.01B May 1, 2010
Fourth Revised Sheet No. 66B.01c May 1, 2010
Ninth Revised Sheet No. 66B.02 June 1, 2009
Seventh Revised Sheet No. 66B.03 June 1, 2009
Eighth Revised Sheet No. 66B.04 June 1, 2009
Second Revised Sheet No. 66B.05 March 1, 2009
Third Revised Sheet No. 66B.06 February 3, 2010
Fifth Revised Sheet No. 66B.07 March 1, 2009
Second Revised Sheet No. 66B.08 March 1, 2009
Fifth Revised Sheet No. 66B.09 October 1, 2009
Original Sheet No. 66B.10 November 1, 2008
Third Revised Sheet No. 66B.11 June 1, 2009
First Revised Sheet No. 66B.12 March 1, 2009
Second Revised Sheet No. 66B.13 April 1, 2009
Second Revised Sheet No. 66B.13a April 1, 2009
Sixth Revised Sheet No. 66B.14 May 1, 2010
Fourth Revised Sheet No. 66B.15 June 1, 2009
Second Revised Sheet No. 66B.16 April 17, 2010
Second Revised Sheet No. 66B.17 July 1, 2009
First Revised Sheet No. 66B.18 November 1, 2009
Second Revised Sheet No. 66B.19 July 1, 2009
First Revised Sheet No. 66B.20 May 1, 2009
Second Revised Sheet No. 66B.21 November 1, 2009
Original Sheet No. 66B.22 May 1, 2009
First Revised Sheet No. 66B.23 July 1, 2009
First Revised Sheet No. 66B.24 July 1, 2009
First Revised Sheet No. 66B.25 April 1, 2010
Second Revised Sheet No. 66B.26 September 1, 2009
First Revised Sheet No. 66B.27 April 1, 2010
First Revised Sheet No. 66B.28 May 1, 2010
First Revised Sheet No. 66B.29 April 1, 2010
First Revised Sheet No. 66B.30 May 1, 2010
17 Revised Sheet No. 66B.35 May 1, 2010
Second Revised Sheet No. 66B.36 May 1, 2010
Original Sheet No. 66B.37 April 1, 2010
Original Sheet No. 66B.38 April 1, 2010
Original Sheet No. 66B.39 April 1, 2010
Original Sheet No. 66B.40 April 1, 2010
Original Sheet No. 66B.41 May 1, 2010
15 Revised Sheet No. 66C February 15, 2009
15 Revised Sheet No. 66D February 15, 2009
Third Revised Sheet No. 66E February 15, 2009
Eighth Revised Sheet No. 67 June 1, 2010
Fourth Revised Sheet No. 67A May 1, 2010
Original Sheet No. 67B May 1, 2010
Eighth Revised Sheet No. 68 November 1, 1998
First Revised Sheet No. 69 February 15, 2009
Original Sheet No. 80 February 15, 2009
First Revised Sheet No. 80A March 1, 2009
Fifth Revised Sheet No. 80B July 12, 2010
Original Sheet No. 81 February 15, 2009
Third Revised Sheet No. 100 April 17, 2010
Tenth Revised Sheet No. 101 August 16, 2010
Fourth Revised Sheet No. 102 August 16, 2010
Seventh Revised Sheet No. 103 April 17, 2010
Sixth Revised Sheet No. 104 April 17, 2010
Fourth Revised Sheet No. 105 February 13, 2003
Fourth Revised Sheet No. 106 November 1, 1998
Sub Second Revised Sheet No. 107 November 1, 1998
Second Revised Sheet No. 108 February 1, 2005
Eighth Revised Sheet No. 109 April 17, 2010
Third Revised Sheet No. 110 November 1, 2003
Fourth Revised Sheet No. 111 April 17, 2010
First Revised Sheet No. 112 April 1, 1995
First Revised Sheet No. 113 April 1, 1995
Sixth Revised Sheet No. 114 August 16, 2010
Ninth Revised Sheet No. 115 April 17, 2010
Sixth Revised Sheet No. 116 August 16, 2010
Sixth Revised Sheet No. 117 August 16, 2010
Fifth Revised Sheet No. 118 August 16, 2010
Seventh Revised Sheet No. 119 April 17, 2010
Third Revised Sheet No. 120 October 1, 2007
Second Revised Sheet No. 121 November 1, 2003
First Revised Sheet No. 122 February 1, 2005
Fourth Revised Sheet No. 123 August 1, 2004
Fourth Revised Sheet No. 124 June 1, 1999
Fifth Revised Sheet No. 125 April 17, 2010
Fourth Revised Sheet No. 125A August 16, 2010
Second Revised Sheet No. 125B August 16, 2010
Fifth Revised Sheet No. 125C April 17, 2010
Third Revised Sheet No. 125D April 17, 2010
Fourth Revised Sheet No. 125E April 17, 2010
Fourth Revised Sheet No. 125F April 17, 2010
Third Revised Sheet No. 126 October 1, 2007
Second Revised Sheet No. 127 November 28, 2005
Second Revised Sheet No. 128 August 16, 2010
Fourth Revised Sheet No. 129 April 17, 2010
Third Revised Sheet No. 130 June 11, 2007
Second Revised Sheet No. 131 August 1, 2004
Sixth Revised Sheet No. 132 June 1, 1999
Fourth Revised Sheet No. 133 April 17, 2010
Fourth Revised Sheet No. 134 June 1, 2008
12 Revised Sheet No. 135 April 17, 2010
Eighth Revised Sheet No. 135A April 17, 2010
Sixth Revised Sheet No. 135B June 1, 2008
Sixth Revised Sheet No. 135C June 1, 2008
15 Revised Sheet No. 135D April 17, 2010
Ninth Revised Sheet No. 136 May 24, 2008
Second Revised Sheet No. 137 September 1, 2004
Ninth Revised Sheet No. 138 April 17, 2010
Seventh Revised Sheet No. 139 April 17, 2010
Fifth Revised Sheet No. 140 August 1, 2006
Seventh Revised Sheet No. 141 May 9, 2008
Ninth Revised Sheet No. 142 July 9, 2007
Fourth Revised Sheet No. 142A July 9, 2007
Second Revised Sheet No. 142B July 9, 2007
Ninth Revised Sheet No. 142C April 17, 2010
First Revised Sheet No. 142D April 17, 2010
Original Sheet No. 142E January 1, 2004
Eighth Revised Sheet No. 143 July 9, 2007
21 Revised Sheet No. 144 April 17, 2010
Eighth Revised Sheet No. 145 July 9, 2007
Tenth Revised Sheet No. 146 July 9, 2007
Third Revised Sheet No. 146A April 17, 2010
Sixth Revised Sheet No. 147 July 9, 2007
Fourth Revised Sheet No. 148 March 1, 2005
Second Revised Sheet No. 149 March 1, 2005
First Revised Sheet No. 150 November 1, 1994
First Revised Sheet No. 151 November 1, 1994
Second Revised Sheet No. 152 January 29, 2000
Third Revised Sheet No. 153 April 1, 2008
Ninth Revised Sheet No. 154 August 16, 2010
Fourth Revised Sheet No. 155 August 16, 2010
Second Revised Sheet No. 156 September 24, 2006
First Revised Sheet No. 157 September 24, 2006
Second Revised Sheet No. 158 September 24, 2006
First Revised Sheet No. 159 September 24, 2006
Second Revised Sheet No. 160 September 24, 2006
Second Revised Sheet No. 161 September 24, 2006
Second Revised Sheet No. 162 September 24, 2006
Fourth Revised Sheet No. 163 September 24, 2006
First Revised Sheet No. 164 September 24, 2006
Original Sheet No. 165 August 1, 2007
Original Sheet No. 166 August 1, 2007
First Revised Sheet No. 167 April 17, 2010
Sheet No. 168 August 1, 2007
10 Revised Sheet No. 200 April 17, 2010
14 Revised Sheet No. 201 April 17, 2010
First Revised Sheet No. 201A September 24, 2006
First Revised Sheet No. 201B September 24, 2006
Original Sheet No. 201C February 25, 2006
Second Revised Sheet No. 202 January 1, 2005
Fourth Revised Sheet No. 203 November 1, 2007
Twelfth Revised Sheet No. 204 February 25, 2006
Fifth Revised Sheet No. 205 July 2, 2009
First Revised Sheet No. 205A July 9, 2007
Eighth Revised Sheet No. 206 September 24, 2006
Fifth Revised Sheet No. 206A November 1, 2007
Original Sheet No. 207 November 1, 1993
First Revised Sheet No. 208 April 17, 2010
Original Sheet No. 209 November 1, 1993
First Revised Sheet No. 210 March 1, 2005
2 Substitute First Revised Sheet No. 211 November 1, 1995
Substitute Second Revised Sheet No. 212 July 5, 2005
Fifth Revised Sheet No. 213 April 17, 2010
First Revised Sheet No. 214 November 22, 2003
Fifth Revised Sheet No. 215 April 17, 2010
Fourth Revised Sheet No. 216 February 21, 2009
Original Sheet No. 217 November 1, 1993
Original Sheet No. 218 November 1, 1993
Eighth Revised Sheet No. 219 April 17, 2010
Tenth Revised Sheet No. 220 October 1, 2007
Seventh Revised Sheet No. 221 April 17, 2010
Eighth Revised Sheet No. 222 April 17, 2010
First Revised Sheet No. 222A April 17, 2010
Sheet No. 223 May 1, 2002
Substitute Eighth Revised Sheet No. 226 June 1, 2008
Substitute Fifth Revised Sheet No. 227 June 1, 2008
Fourth Revised Sheet No. 228 February 25, 2006
Substitute Original Sheet No. 228A November 1, 2003
First Revised Sheet No. 229 November 1, 2003
First Revised Sheet No. 230 February 25, 2006
First Revised Sheet No. 231 April 1, 1995
First Revised Sheet No. 232 April 1, 1995
Third Revised Sheet No. 233 April 17, 2010
Sheet No. 234 May 1, 2002
Sheet No. 238 November 1, 2003
Second Revised Sheet No. 247 November 1, 1998
Third Revised Sheet No. 248 November 1, 1998
Second Revised Sheet No. 249 November 1, 1998
Substitute First Revised Sheet No. 250 November 1, 1998
Seventh Revised Sheet No. 251 April 17, 2010
Substitute 13 Revised Sheet No. 252 June 11, 2007
Seventh Revised Sheet No. 253 June 11, 2007
Third Revised Sheet No. 253A June 11, 2007
Fourth Revised Sheet No. 254 June 11, 2007
Sixth Revised Sheet No. 255 June 11, 2007
Sixth Revised Sheet No. 256 April 17, 2010
Fifth Revised Sheet No. 257 October 1, 2002
Tenth Revised Sheet No. 258 October 1, 2007
12 Revised Sheet No. 259 July 9, 2007
Second Revised Sheet No. 259A October 1, 2006
Original Sheet No. 259B October 1, 2006
Eighth Revised Sheet No. 260 October 1, 2007
Fifth Revised Sheet No. 260A April 17, 2010
Sixth Revised Sheet No. 261 July 9, 2007
Second Revised Sheet No. 262 July 9, 2007
Tenth Revised Sheet No. 263 April 17, 2010
Ninth Revised Sheet No. 263A September 24, 2006
Fourth Revised Sheet No. 263B November 1, 2001
Fourth Revised Sheet No. 263C November 1, 2003
Fourth Revised Sheet No. 263D November 1, 2003
Third Revised Sheet No. 263E August 1, 2001
Fifth Revised Sheet No. 263F November 1, 2008
Fifth Revised Sheet No. 263G November 1, 2008
13 Revised Sheet No. 263H November 1, 2009
12 Revised Sheet No.263H.1 November 1, 2009
Second Revised Sheet No. 263I November 1, 2005
Eighth Revised Sheet No. 264 April 17, 2010
Tenth Revised Sheet No. 265 April 17, 2010
Second Revised Sheet No. 265A April 17, 2010
Fifth Revised Sheet No. 266 April 17, 2010
Ninth Revised Sheet No. 267 February 1, 2005
First Revised Sheet No. 267A February 1, 2005
Ninth Revised Sheet No. 268 April 17, 2010
Third Revised Sheet No. 268A April 17, 2010
Eighth Revised Sheet No. 269 July 16, 2005
Fourth Revised Sheet No. 269A February 14, 2005
Fourth Revised Sheet No. 269B April 17, 2010
Original Sheet No. 269C February 14, 2005
Third Revised Sheet No. 270 April 17, 2010
Fourth Revised Sheet No. 271 September 24, 2006
Second Revised Sheet No. 272 August 1, 2004
Second Revised Sheet No. 273 August 1, 2004
Original Sheet No. 274 November 1, 1993
Second Revised Sheet No. 275 July 9, 2007
Original Sheet No. 276 November 1, 1993
Original Sheet No. 277 November 1, 1993
Second Revised Sheet No. 278 November 1, 2003
First Revised Sheet No. 279 May 10, 1996
First Revised Sheet No. 280 May 10, 1996
Third Revised Sheet No. 281 November 1, 1998
Third Revised Sheet No. 282 November 1, 1998
Third Revised Sheet No. 283 November 1, 2003
Third Revised Sheet No. 284 February 21, 2009
Seventh Revised Sheet No. 285 April 17, 2010
Fourth Revised Sheet No. 285A April 17, 2010
Second Revised Sheet No. 285B April 17, 2010
Substitute 11 Revised Sheet No. 286 December 26, 2008
13 Revised Sheet No. 287 April 17, 2010
Fifth Revised Sheet No. 287A December 26, 2008
Ninth Revised Sheet No. 288 February 21, 2009
Substitute 11 Revised Sheet No. 289 February 21, 2009
Original Sheet No. 289A July 1, 2003
Original Sheet No. 289B July 1, 2003
Sixth Revised Sheet No. 290 September 24, 2006
Original Sheet No. 290A January 1, 2005
Seventh Revised Sheet No. 291 April 1, 2005
First Revised Sheet No. 291A January 1, 2005
Sixth Revised Sheet No. 292 February 25, 2006
Fifth Revised Sheet No. 292A January 1, 2005
First Revised Sheet No. 293 April 1, 1995
Fourth Revised Sheet No. 296 January 1, 2005
Substitute Sixth Revised Sheet No. 297 December 30, 2004
Third Revised Sheet No. 298 February 25, 2006
Fifth Revised Sheet No. 299 February 25, 2006
Substitute Fifth Revised Sheet No. 299A August 1, 2004
Ninth Revised Sheet No. 300 October 1, 2007
Fourth Revised Sheet No. 300A October 1, 2007
Sixth Revised Sheet No. 301 June 1, 2002
Sixth Revised Sheet No. 301A October 1, 2007
Third Revised Sheet No. 301B November 7, 2005
Fourth Revised Sheet No. 301C November 7, 2005
Seventh Revised Sheet No. 302 September 24, 2006
First Revised Sheet No. 302A November 7, 2005
Tenth Revised Sheet No. 303 May 15, 2005
Fifth Revised Sheet No. 304 April 17, 2010
Fifth Revised Sheet No. 305 June 11, 2007
Substitute Fourth Revised Sheet No. 305A September 22, 2007
First Revised Sheet No. 305B September 1, 2004
Fourth Revised Sheet No. 306 April 17, 2010
Original Sheet No. 307 November 1, 2003
Seventh Revised Sheet No. 308 April 17, 2010
Sixth Revised Sheet No. 309 June 1, 2008
Sheet No. 310 November 1, 2003
Seventh Revised Sheet No. 400 February 21, 2009
Fifth Revised Sheet No. 400A February 21, 2009
Sixth Revised Sheet No. 401 February 21, 2009
Fifth Revised Sheet No. 402 February 21, 2009
Eighth Revised Sheet No. 403 April 17, 2010
Ninth Revised Sheet No. 403A April 17, 2010
Fourth Revised Sheet No. 404 February 21, 2009
Second Revised Sheet No. 405 September 24, 2006
Fourth Revised Sheet No. 406 February 21, 2009
Second Revised Sheet No. 406A February 21, 2009
Third Revised Sheet No. 407 February 21, 2009
Fourth Revised Sheet No. 408 February 21, 2009
Second Revised Sheet No. 408A February 21, 2009
Fourth Revised Sheet No. 409 February 21, 2009
Second Revised Sheet No. 409A February 21, 2009
Second Revised Sheet No. 410 September 1, 2004
First Revised Sheet No. 426 December 1, 1995
Seventh Revised Sheet No. 431 February 21, 2009
Second Revised Sheet No. 431A February 21, 2009
Fourth Revised Sheet No. 432 February 21, 2009
Sheet No. 433 November 1, 2003
Seventh Revised Sheet No. 441 February 21, 2009
Second Revised Sheet No. 441A February 21, 2009
Seventh Revised Sheet No. 442 February 21, 2009
Fourth Revised Sheet No. 442A February 21, 2009
Original Sheet No. 442A.01 February 21, 2009
Fourth Revised Sheet No. 442B February 21, 2009
Third Revised Sheet No. 442C May 24, 2008
Sixth Revised Sheet No. 443 February 21, 2009
Second Revised Sheet No. 443A February 21, 2009
Fourth Revised Sheet No. 444 February 21, 2009
Fifth Revised Sheet No. 445 February 21, 2009
Seventh Revised Sheet No. 446 February 21, 2009
Second Revised Sheet No. 446A February 21, 2009
Fifth Revised Sheet No. 447 February 21, 2009
Third Revised Sheet No. 448 February 21, 2009
First Revised Sheet No. 449 September 14, 2007
Third Revised Sheet No. 452 February 21, 2009
Fourth Revised Sheet No. 453 February 21, 2009
Third Revised Sheet No. 454 September 22, 2007
Fourth Revised Sheet No. 455 April 17, 2010
Second Revised Sheet No. 456 September 22, 2007
Second Revised Sheet No. 457 February 21, 2009
Fifth Revised Sheet No. 458 February 21, 2009
Second Revised Sheet No. 458A February 21, 2009
Third Revised Sheet No. 459 September 24, 2006
First Revised Sheet No. 459A September 24, 2006
First Revised Sheet No. 460 September 24, 2006
Fourth Revised Sheet No. 461 April 17, 2010
Second Revised Sheet No. 462 February 21, 2009
Sheet No. 463 November 1, 2000
Sheet No. 479 November 1, 2003
Sheet No. 486 April 1, 2003
First Revised Sheet No. 488 April 1, 1995
First Revised Sheet No. 489 April 1, 1995
Sheet No. 490 November 1, 2003
Original Sheet No. 492 November 1, 1993
Substitute Third Revised Sheet No. 510 April 17, 2010