This work aims to reflect on the turnover process between two phases of a power plant construction project - erection and commissioning. Using real data from the project, we propose a new turnover process. Our approach uses recent earned value based schedule methods and try to ensure a more effective commissioning regarding main schedule priorities. We believe that in consequence we are able to reduce the project duration and improve the client-contractor relationship on site. Our contribution to the improvement of this field intends to be multiple: First, we warn for potential mistakes while enquiring the project schedule performance using traditional approaches, namely on projects facing different productivity rates during their lifecycle. Second we demonstrate how emergent earned schedule method improves this monitoring process. Finally, to overcome the problem we faced during our power plant construction project to calculate and communicate the "to complete schedule performance index" in time units, we propose a new approach. Our new approach was validated with real data from the real project.