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DTE Energy Advanced Implementation of Energy Storage Technologies Final Technology Performance Report

March 15, 2016

Detroit Edison



This report describes the implementation of 1-MW of distributed Li-ion energy storage on a distribution circuit in the DTE Energy service area. DTE Energy is a Michigan based diversified Energy Company that provides electric service to 2.1 million residential, business and industrial customers in southeast Michigan.

DTE Energy has worked with selected sub recipients, consultants, contractors and vendors to demonstrate the use and benefits of distributed energy storage, often referred to as Community Energy Storage (CES), in a utility territory and to test the ability to integrate secondary use electric vehicle (EV) batteries in the CES demonstration.

This is the first large scale utility community energy storage project with an aggregated capacity of 1-MW. Its 21 energy storage systems were managed by a Distributed Energy Resource Management System (DERMS). This DERMS was created to allow aggregation of any asset within the DTE Energy service territory using utility industry protocol (DNP3).

This project installed 18 S&C Electric (S&C) supplied 25kW/50kWh CES units, a 500kW Li-ion battery storage device integrated with a 500 kW solar system and two repurposed (secondary use) energy storage systems using Fiat Chrysler Automobile (FCA) 500e EV batteries. The first CES unit was installed at the DTE Energy Training and Development Center in Westland, MI for installation training, verification of work and operational procedures, and engineering design documentation. The remaining 17 CES units and the 500 kW battery are installed on a distribution circuit designated as TRINITY 9342 located near Monroe, MI. The repurposed batteries were installed at DTE Energy headquarter and at Next Energy Center in Detroit.

The project objectives are to integrate the CES units into the electric utility system, determine the performance of the CES and the control system, and the development and integration of CES devices from secondary-use battery. The analysis identified gaps, improvements, and suggestions on how devices and control systems can be standardized.

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