NORTHERN ILLINOIS GAS CO /IL/ /NEW/

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General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Regulation FD Disclosure

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Letter from the SEC

Correspondence with the SEC

General form for quarterly reports under Section 13 or 15(d)

Letter from the SEC

Annual report pursuant to Section 13 or 15(d)

Regulation FD Disclosure

4.01,9.01

1.01,2.03,4.01,5.01,5.03,8.01,9.01

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

2.03

Annual report pursuant to Section 13 or 15(d)

8.01,9.01

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

2.03

Annual report pursuant to Section 13 or 15(d)

8.01,9.01

General form for quarterly reports under Section 13 or 15(d)

8.01,9.01

General form for quarterly reports under Section 13 or 15(d)

2.03

General form for quarterly reports under Section 13 or 15(d)

1.01,9.01

8.01,9.01

Notice of Effectiveness

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933

7.01,9.01

General form for quarterly reports under Section 13 or 15(d)

2.03

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

7.01,9.01

7.01,9.01

Annual report pursuant to Section 13 or 15(d)

5.03,9.01

2.03,9.01

7.01,9.01

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Post-effective amendment filed solely to add exhibits

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Delayed or Continuous Offering

Registration statement under Securities Act of 1933

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Delayed or Continuous Offering