The prime purpose of this study is to assist the government of the Cook Islands (GOCI) to assess the investment for rehabilitation and expansion of electric supply throughout the Cook Islands, including Rarotonga. This report has been modified to be a resourceful document to assist structural reform while continuing to provide a pre-investment analysis for concessionary Bank financing. The project is done so that it is beneficial to outer islands such as Aitutaki, Manihiki, Penrhyn. Attached in this record are Volume 1 (Final Report) and Volume II (Appendixes).