IBM Global Services IBM Corporation | NRG Energy, Inc.—Serengeti Tracker E-billing Return on Investment Study Page 1 NRG Energy, Inc. Serengeti Tracker E-billing Return on Investment Study EXECUTIVE SUMMARY IBM Global Services (IBM) was retained by Serengeti Law to conduct this return on investment (ROI) study covering NRG Energy, Inc.’s (NRG’s) use of the electronic billing functionality within Serengeti Tracker for the twelve-month period ending April 30, 2009. During its first year using Serengeti, NRG realized a return on investment of 1667% or approximately 16.7 times the system cost. The system cost consisted of the monthly fees for the corresponding period plus a one-time implementation fee. Savings from Serengeti Tracker E-billing C

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