1. 1 © 2007 Electric Power Research Institute, Inc. All rights reserved. Managing Complexity: The IntelliGrid Environments External Corporations Corporate Utility Market participants

2. 2 © 2007 Electric Power Research Institute, Inc. All rights reserved. AMI Management Systems Wireless Data Collection Paging Data Collection CIS OMS WMS GIS/DPS Wide Area Networks Field Area Networks Data Collection Systems Existing Utility Sytems Web Presentation Regulators and Agencies Internet Public Wireless (Paging, GPRS, 1XRTT) Telephone Data Collection Smart Meters & Other Devices Power Line Data Collection Usage Data Repository Private Wireless (WiMAX) Asset Mgmt MDM System Energy Service Provider CSR Third Parties Retailer Data Exchange Satellite BPL Customer PSTN PLC/BPL Mesh RF Star RF AMI and Smart Grid System Architecture

3. 3 © 2007 Electric Power Research Institute, Inc. All rights reserved. Utility Structure vs. Smart Grid Interfaces Market / Regulatory Corporate Transmission Distribution Consumer/Load Field Area (FAN) Home or Premise Area (HAN) Wide Area (WAN) Enterprise (ESB) Extranet Note: Energy sources can be found in T, D, or C

4. 4 © 2007 Electric Power Research Institute, Inc. All rights reserved. GWAC Stack – Levels of Interoperability