CERC’s Third Order: Enhancing Infirm Power Scheduling Under Indian Electricity Grid Code 2023

The Central Electricity Regulatory Commission (CERC) recently issued an order to address challenges in implementing specific provisions of the Indian Electricity Grid Code (IEGC) 2023. The Grid Code, notified on July 11, 2023, came into effect on October 1, 2023. Since its introduction, the Commission has made amendments and issued orders to ensure smooth implementation. The third removal of difficulties order focuses on scheduling infirm power before the declaration of commercial operation date (COD).

Infirm power, which is generated during pre-commissioning activities, plays a vital role in testing and commissioning generating units. However, scheduling this power effectively has posed challenges. The IEGC 2023 lays out general guidelines for power scheduling, but specific provisions for infirm power scheduling remain undefined. Recognizing this gap, the National Load Dispatch Centre (NLDC) suggested incorporating explicit modalities into the Grid Code.

The order differentiates between two categories of generators: General Sellers and Renewable Energy Generating Stations (REGS), including those with energy storage systems. It outlines separate criteria for scheduling infirm power for each category. For General Sellers, infirm power can be scheduled only after the first synchronization with the grid and is permissible for up to one year. Meanwhile, REGS and energy storage systems can schedule infirm power post a successful trial run certified by the Regional Load Dispatch Centre (RLDC).

The trial run process for REGS with installed capacities of 250 MW or more is revised to allow greater flexibility. While the Grid Code initially limited trial runs to a maximum of four installments, the Commission now permits an unlimited number of installments, provided each installment covers at least 50 MW.

A successful trial run certificate from RLDC is mandatory for scheduling power. Before obtaining this certificate, generating stations must provide RLDC with details of testing and commissioning activities. The RLDC is responsible for maintaining records and ensuring compliance with technical standards.

Post-trial operation, the generating stations are encouraged to declare COD promptly. If COD is delayed, reasons must be documented. Power generated after a successful trial run but before COD will be handled according to the terms of the power purchase agreement (PPA). If no specific provisions exist, beneficiaries will have the first right of refusal, after which the power can be sold in the market.

This order, issued under the Commission’s powers to remove difficulties, aims to streamline the scheduling of infirm power, ensuring clarity for stakeholders. The provisions will remain effective until formal amendments are incorporated into the Grid Code.