Filed by AGL Resources Inc.
Pursuant to Rule 425 under the Securities Act of 1933
and deemed filed pursuant to Rule 14a-12
under the Securities Exchange Act of 1934
Subject Company: Nicor Inc.
Commission File No: 333-172084

Merger Update: ICC Filing
Yesterday, AGL Resources and Nicor filed a post-trial brief with the Illinois Commerce Commission. This is a scheduled filing in accordance with the legal process established by the ICC in January of this year. The filing completes another step in the regulatory process required for approval of the proposed merger.
The filing summarizes our recent testimony in the evidentiary hearings with the ICC, and similar briefs also were filed by other active parties in the case. As the briefs are available on the ICC website, you may receive questions from your team members. The following key points should help you address employee questions or concerns about the filing: 
The filing of the post-trial brief is a scheduled event and represents another step in the regulatory process required for approval of the proposed merger.  
No new information is introduced in the brief, as it summarizes testimony in the evidentiary hearings with the ICC held last month.
The brief reiterates the unprecedented commitments AGL Resources has made related to the future operations of Nicor Gas after the close of the proposed merger in order to ensure customers continue to enjoy the safe, reliable and cost-effective service they do today:
Locate its natural gas distribution headquarters in Naperville, IL.
Maintain the number of full-time equivalent employees involved in the operation of the natural gas business of Nicor Gas for at least three years after the close of the merger. This means that most of the people who have primary contact with customers, are directly involved in field operations or provide necessary support services will continue to perform these functions or similar ones.
Maintain personnel levels in specific areas of safety oversight of the Nicor Gas system for at least five years.
Honor existing union agreements.
Continue philanthropic contributions in communities in the Nicor Gas service territory for at least three years. 
The brief is filed with the Administrative Law Judge who is hearing the case and a final ruling from the ICC is not expected until later in the year. The full case schedule is available on the ICC website (
We continue to work with ICC Staff in an effort to resolve the few remaining issues in the case and still expect to successfully close on the proposed merger by the end of the year.                                
AGL Resources and Nicor believe the combination of the companies will create long-term benefits for customers and establish a platform for growth superior to what either company could achieve alone.
If you have questions that are not addressed here, please consult your company officer who is participating in the integration planning process, or send your thoughts and questions to Thank you for your continued leadership.
Forward Looking Statements
To the extent any statements made in this document contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”).
These forward-looking statements relate to, among other things, our ability to obtain the necessary approvals for the transaction and the expected timing of the completion of the transaction. Forward-looking statements can generally be identified by the use of words such as “believe”, “anticipate”, “expect”, “estimate”, “intend”, “continue”, “plan”, “project”, “will”, “may”, “should”, “could”, “would”, “target”, “potential” and other similar expressions. In addition, any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements. Although certain of these statements set out herein are indicated above, all of the statements in this release that contain forward-looking statements are qualified by these cautionary statements. Although AGL Resources and Nicor believe that the expectations reflected in such forward-looking statements are reasonable, such statements involve risks and uncertainties, and undue reliance should not be placed on such statements. Certain material factors or assumptions are applied in making forward-looking statements, including, but not limited to, factors and assumptions regarding the items outlined above. Actual results may differ materially from those expressed or implied in such statements. Important factors that could cause actual results to differ materially from these expectations include, among other things, the following: the failure to receive, on a timely basis or otherwise, the required approvals by AGL Resources and Nicor stockholders and government or regulatory agencies (including the terms of such approvals); the risk that a condition to closing of the merger may not be satisfied; the possibility that the anticipated benefits and synergies from the proposed merger cannot be fully realized or may take longer to realize than expected; the possibility that costs or difficulties related to the integration of AGL Resources and Nicor operations will be greater than expected; the ability of the combined company to retain and hire key personnel and maintain relationships with customers, suppliers or other business partners; the impact of legislative, regulatory, competitive and technological changes; the risk that the credit ratings of the combined company may be different from what the companies expect; and other risk factors relating to the energy industry, as detailed from time to time in each of AGL Resources’ and Nicor’s reports filed with the Securities and Exchange Commission (“SEC”). There can be no assurance that the proposed merger will in fact be consummated.
Additional information about these factors and about the material factors or assumptions underlying such forward-looking statements may be found in the body of this release, as well as under Item 1.A. in each of AGL Resources’ and Nicor’s Annual Report on Form 10-K for the fiscal year December 31, 2010. AGL Resources and Nicor caution that the foregoing list of important factors that may affect future results is not exhaustive. When relying on forward-looking statements to make decisions with respect to AGL Resources and Nicor, investors and others should carefully consider the foregoing factors and other uncertainties and potential events. All subsequent written and oral forward-looking statements concerning the proposed transaction or other matters attributable to AGL Resources and Nicor or any other person acting on their behalf are expressly qualified in their entirety by the cautionary statements referenced above.  The forward-looking statements contained herein speak only as of the date of this communication. Neither AGL Resources nor Nicor undertakes any obligation to update or revise any forward-looking statement, except as may be required by law.
Additional Information

In connection with the proposed merger, a definitive joint proxy statement/prospectus was mailed on or about May 10, 2011 to shareholders of record of AGL Resources and Nicor as of April 18, 2011. WE URGE INVESTORS TO READ THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS CAREFULLY, AS WELL AS OTHER DOCUMENTS FILED WITH THE SEC, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT AGL RESOURCES, NICOR AND THE PROPOSED TRANSACTION. The definitive joint proxy statement/prospectus, as well as other filings containing information about AGL Resources and Nicor, can be obtained free of charge at the website maintained by the SEC at You may also obtain these documents, free of charge, from AGL Resources’ website ( under the tab Investor Relations/SEC Filings or by directing a request to AGL Resources Inc., P.O. Box 4569, Atlanta, GA, 30302-4569. You may also obtain these documents, free of charge, from Nicor’s website ( under the tab Investor Information/SEC Filings or by directing a request to Nicor Inc., P.O. Box 3014, Naperville, IL 60566-7014.
The respective directors and executive officers of AGL Resources and Nicor, and other persons, may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information regarding AGL Resources’ directors and executive officers is available in the definitive joint proxy statement/prospectus and its definitive proxy statement filed with the SEC by AGL Resources on March 14, 2011, and information regarding Nicor directors and executive officers is available in the definitive joint proxy statement/prospectus and its definitive proxy statement filed with the SEC by Nicor on April 19, 2011. These documents can be obtained free of charge from the sources indicated above. Other information regarding the interests of the participants in the proxy solicitation are included in the definitive joint proxy statement/prospectus and other relevant materials filed with the SEC. This communication shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.