Exhibit 4.5 CERTIFICATE OF TRUST OF KEYSPAN TRUST II This Certificate of Trust is being duly executed as of May 3, 2001 for the purposes of forming a business trust pursuant to the Delaware Business Trust Act (12 Del. C. Section 3801 et seq.) (the "Act"). 1. Name. The name of the business trust formed hereby is "KeySpan Trust II" (the "Trust"). 2. Delaware Trustee. The name and business address of the Delaware resident trustee of the Trust meeting the requirements of Section 3807 of the Act are as follows: Chase Manhattan Bank USA, National Association 1201 Market Street Wilmington, Delaware 19801 Attention: Corporate Trust Administration. 3. Effective Date. This Certificate of Trust, which may be executed in counterparts, shall be effective immediately upon filing with the Secretary of State of the State of Delaware. [rest of page intentionally left blank] 2 IN WITNESS WHEREOF, the undersigned have duly executed this Certificate of Trust in accordance with Section 3811(a)(1) of the Act. THE CHASE MANHATTAN BANK, as Property Trustee BY: /s/ Francine Springer ------------------------------------------- Name: Francine Springer Title: Vice President CHASE MANHATTAN BANK USA, NATIONAL ASSOCIATION, as Delaware Trustee BY: /s/ Denis Kelly ------------------------------------------- Name: Denis Kelly Title: Assistant Vice President /s/ Ronald S. Jendras ------------------------------------------ RONALD S. JENDRAS, as Regular Trustee /s/ Richard A. Rapp ------------------------------------------ RICHARD A. RAPP, as Regular Trustee /s/ Michael J. Taunton ------------------------------------------ MICHAEL J. TAUNTON, as Regular Trustee