The document summarizes the key aspects of the Indian Electricity Grid Code (IEGC) and the State Grid Code regulations in India. The IEGC defines the relationship between regional and state load dispatch centers with transmission utilities and sets rules for inter-state grid planning, connectivity, and operations. The State Grid Code regulations cover various parts including general provisions, transmission planning, connection conditions, grid operations, scheduling and dispatch, metering, and miscellaneous items to facilitate integrated grid operations within states in accordance with the IEGC.

1. IEGC Indian Electricity Grid Code ME(Electrical),DBM Deputy Executive Engineer MSLDC anilgpatil2@rediffmail.com` Anil Patil

2. Indian Electricity Grid Code (IEGC) I ndian Electricity Grid Code (IEGC) defines the relationship between RLDC/SLDC with various interstate TSUs. IEGC is aimed at regulating inter state transmission systems and sets out roles of different entities along with grid code for planning, connectivity conditions and operation etc. Quality objectives are as follows: 1) To enhance overall operational economy and reliability 2) To monitor real time system operation within accepted parameters 3) To derive maximum benefits from integrated operation and equitable sharing of obligations. 4) To ensure system security and integrity using AGC, Reactive power management, Voltage control and Automatic / manual Load Control 5) To plan for outage, operation, demand forecasting and scheduling of requirement in merit order. 6) To plan for quick restoration of system after partial or total black out . IEGC sections also dealt with operating policy, system security aspects, demand estimation for operational purpose, dispatch scheduling, demand control, operational liaison, outage planning procedure etc particularly with reference to Regional Grid and Inter-State operations.

3. State Grid Code - Parts MERC State Grid Code Regulation, 2006 (effective from 1 st April 2006) Compliance, amendment, dispute, difficulties etc Miscellaneous G Specification, standards, procedures for metering Metering Code F Modality of daily scheduling for dispatch and flow of information Scheduling & Dispatch Code E Grid operation, coordination, control and reporting Operating Code D Requirement and procedures for connection with grid Connection Conditions C Transmission System Planning data and procedures Planning Code B Grid Coordination Committee General A

4. Part-A GENERAL Regulation shall apply to STU, SLDC, TL, User of InSTS . Existing TL of InSTS is given maximum one year period for compliance: Entering into Connection Agreement Providing required Protection Systems Providing necessary Communication Facilities Providing Recording Instruments Developing Single Line Diagrams Developing Site Common Drawings Installation and operation of Meters STU, SLDC to put up State Grid Code on website and provide it on request at reasonable price.

5. Part-A GENERAL 5) Establishment of Grid Coordination Committee (GCC) for facilitating implementation and review of SGC: Shall be constituted by STU within 30 days from notification. Structure of GCC and Members (STU to manage the functioning) 1) State Transmission Utility – Chairperson (Director) 2) State Load Dispatch Centre- Head of SLDC (Convenor) 3) Generating Companies in the State- Rotationally (one year) 4) Transmission Licensees in the State- (Senior position in org) 5) State owned Distribution Licensees in the State- 6) Privately owned Distribution Licensees in the State- 7) Electricity Traders in the State- 8) Western Regional Load Dispatch Centre- 9) other persons as may be nominated by MERC-

6. Part-B PLANNING CODE 8.1) STU to publish on web the transmission Plan for InSTS (5 years) and update every 30 th September and approved investment plan as prescribed. 9) Planning Criterion – security and stability on contingency outage studies, adequate redundancy, one spare converter transformer for HVDC, reactive power compensation studies. Maintain Standard and Detailed Planning data from TL and Users. 10.2.2) Formulation of standard format for submission of planning data to STU within 30 days

7. Part-C CONNECTION CONDITIONS

8. Part-C CONNECTION CONDITIONS

9. Part-D OPERATING CODE

10. Part-E: SCHEDULING & DISPATCH CODE MERC shall specify Scheduling and Dispatch Code within 6 months in consultation with SLDC and after calling public comments on draft Objectives Action and responsibilities of SLDC and Users in daily scheduling process Modality of flow of information between SLDC and Users for Scheduling and Dispatch, SLDC and TL SLDC and RLDC Consistent with IEGC specified by CERC

11. Part-F METERING CODE STU shall develop a Metering Code and submit to MERC for approval within 60 days Covers: Minimum requirement and standards for installation and operation of meters to be provided by TL or Users at the connection point Provisions for location, Specification and accuracy limits Rights, responsibilities and procedures related to data recording, storage and transfer from meters Calibration procedure Maintenance, access and inspection Address metering discrepancies and defects, failures

12. Part-G MISCELLANEOUS Dispute if any may be referred to MERC or forums as specified by the Commission. STU shall be responsible for monitoring the compliance of the Users, TL for the rules and procedures developed under Part B,C,F of SGC. SLDC shall be responsible for monitoring the compliance of the Users and TL for the rules and procedures developed under Part D,E of SGC. Non-compliance shall be reported to the Commission. Directions of the WRLDC to any TL, Users of InSTS shall be issued through SLDC for compliance. SLDC may issue direction and exercise such supervision required for achieving maximum economy and efficiency of integrated grid operation. Dispute if any, regarding quality, security and integrated operation of State Grid shall be referred to MERC. Pending the decision ,SLDC instructions shall be complied. Failure in compliance of Grid Code by the Users, TL may lead to disconnection.

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