AFC Audit Preliminary Report 010306

Audit of the Available Flowgate Capacity Process Entergy Services, Inc. PERFORMED BY Southwest Power Pool PUBLISHED: February 15, 2006 PRELIMINARY AFC Audit Report TABLE OF CONTENTS I. EXECUTIVE SUMMARY .................................................................. 3 A. OVERVIEW........................................................................................ 3 B. OBJECTIVE 4 C. METHODOLOGY................................................................................ 4 D. FINDINGS AND RECOMMENDATIONS................................................. 5 II. PROCEDURAL BACKGROUND (AUDIT SCOPE T2) ...............5 III. METHODOLOGY (AUDIT SCOPE T4, T5)..............................8 IV. AUDIT FINDINGS....................................................................9 A. SOFTWARE COMPARISON (AUDIT SCOPE T3) ............................... 9 B. DATA SELECTION AND USE (AUDIT SCOPE T6, T9, T10) ............ 10 1. Entergy Transmission and Network Customer Data (Audit Scope T6, T9)...................................................................................................... 10 2. Effect of Network Customer Decisions (Audit Scope T10)........... 12 C. DATA ADJUSTMENT PROCESS (AUDIT SCOPE T7)....................... 13 D. MODEL PARAMETERS (AUDIT SCOPE T8) ................................... 15 1. Parameter Selection (Audit Scope T8a).... ...