Indian Electricity Grid Code

1 1 Draft Indian Electricity Grid Code (To be effective from 1st April 2010) Central Electricity Regulatory Commission 3rd & 4th Floor, Chanderlok Building, 36, Janpath, New Delhi- 110001 Web- Ph: 91-11-23353503 Fax: 91-11-23753923 2 CONTENTS Clause Title Page No. Glossary and Definitions 1 Chapter 1.

2 General Introduction 8 Objective 8 Scope 9 Structure of the IEGC 9 Non-Compliance 11 Chapter 2 : Role of various Organizations and their linkages Introduction 13 Role of NLDC 13 Role of RLDC 14 Role of RPC

3 15 Role of CTU 16 Role of CEA 17 Role of SLDC 18 Role of STU 18 Chapter 3.

4 Planning Code for Inter State Transmission Introduction 20 Objective 21 Scope 21 Planning Philosophy 21 Planning Criterion 23 Planning Data 24 Implementation of Transmission Plan 24 Chapter 4.

5 Connection Code Introduction 25 Objective 25 Scope 25 Procedure for Connection 26 Connection Agreement 26 Important Technical Requirements for Connectivity to the Grid 26 International Connections to ISTS 28 Schedule of Assets of Regional Grid 29 Connectivity of Renewable Energy Generating Stations to the Grid

6 29 3 Chapter 5 : Operating Code for Regional Grids Operating Philosophy 33 System Security Aspects 34 Demand Estimation for Operational Purposes 39 Demand Management 39 Periodic Reports

7 41 Operational Liaison 42 Outage Planning 43 Recovery Procedures 45 Event Information 46 Chapter 6 : Scheduling and despatch Code Introduction 48 Objective 48 Scope 48 Demarcation of Responsibilities 49 Scheduling

8 And despatch procedures 55 Reactive Power and Voltage Control 61 Annexure 1: Complementary Commercial Mechanisms 63 Annexure 2: Payment for Reactive Energy Exchanges on State-owned Lines 67 Chapter 7: Miscellaneous 69 4 1 Glossary and Definitions Sl. Item Definition 1 Act The Electricity Act, 2003 as amended from time to time. 2 Ancillary Services "Ancillary Services" in power system (or grid) operation means support services necessary to support the power system (or grid) operation in maintaining power quality, reliability and security of the grid, eg.

9 Active power support for load following, reactive power support, black start, etc 3 Automatic Voltage Regulator (AVR) A continuously acting automatic excitation control system to control the voltage of a Generating Unit measured at the generator terminals. 4 Available Transmission Capability (ATC) The transfer capability of the inter-control area transmission system available for scheduling commercial transactions (through long term access, medium term open access and short term open access) in a specific direction, taking into account the network security.

10 Mathematically ATC is the Total Transfer Capability less Transmission Reliability Margin. 5 Beneficiary A person who has a share in an ISGS is beneficiary of the respective ISGS. 6 Bilateral Transaction A transaction for exchange of energy (MWh) between a specified buyer and a specified seller, directly or through a trading licensee or discovered at power exchange through anonymous bidding, from a specified point of injection to a specified point of drawal for a fixed or varying quantum of power (MW) for any time period during a month 7 B