Duet Group is comprised of Diversified Utility and Energy Trust No.1 (DUET1), Diversified Utility and Energy Trust No.2 (DUET2), Diversified Utility and Energy Trust No.3 (DUET3) and DUET Investment Holdings Limited (DIHL). The principal activity of DUET1, DUET2, DUET3 and DIHL is investment in energy utility assets. The investment policy of the DUET Group is to invest funds in accordance with the provisions of the Trust Constitutions and the governing documents of the individual entities within the DUET Group. The business segments of the Company are gas transmission, gas distribution and electricity distribution. AMPCI Macquarie Infrastructure Management No.1 Limited (RE1) acts as responsible entity for DUET1 and manager of DIHL. AMPCI Macquarie Infrastructure Management No.2 Limited (RE2) acts as responsible entity for DUET2 and DUET3. On May 31, 2007, the Company acquired 28.9% interest in Duquesne Light Holdings (DLH).(Source: ARS)