TNERC Clarifies Deviation Charges for RE Generators in Draft Regulations

TNERC Clarifies Deviation Charges for RE Generators in Draft Regulations

The Tamil Nadu Electricity Regulatory Commission  (TNERC) has released the draft Forecasting, Scheduling and Deviation Settlement and related matters for wind and solar generation) Regulations, 2023.

The draft Regulations will be taken into consideration after the expiry of thirty days from the date of publication of the notification on the TNERC website.

The Regulations have been announced with an intention to facilitate grid integration of wind and solar energy generated in Tamil Nadu while maintaining grid stability by way of forecasting, scheduling and a mechanism for the settlement of deviations by generators. The draft indicated that in order to maintain system security, stability and reliability, the State Load Dispatch Centre (SLDC) shall take into consideration the forecasts of wind and solar generation for Week-Ahead, Day-Ahead and Intra-Day operations and scheduling, and longer term forecasts for its planning.

Applicability 

The TNERC regulations shall apply to all wind and solar energy generators but does not include rooftop PV solar power projects of capacity less than 1 MW in Tamil Nadu connected to the Intra-State Transmission System or Distribution System.

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Forecasting and Scheduling Code
As per the TNERC proposed norms, the wind / solar energy generators shall appoint a single Qualified Co-ordinating Agency (QCA) to represent on their behalf and comply with the requirements of forecasting and scheduling separately. The wind/solar generators who do not wish to avail the services of the single QCA appointed by the majority of the generators shall have the option to avail the services of the SLDC for forecasting and scheduling services.

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Day Ahead Scheduling 

The Day-Ahead schedule shall comprise of the wind or solar energy generation to be scheduled in each 15-minute time block starting from 00:00 hours of the following day, and for all 96 time blocks of that day and the Week-Ahead Schedule shall contain the same information for the next seven days.

Such revisions shall be effective from the 6th time block following the time block in which notice was given. There may be one revision for each time slot of one and half hours starting from 00.00 hours of a particular day, subject to a maximum of 16 revisions during the day.

Deviation settlement

The TNERC draft rules said that the sale of power within Tamil Nadu by wind and solar energy generators connected to the Intra-State Transmission network shall be settled by the procurers on the basis of their actual generation, and the deviation settlement shall be undertaken as mentioned in the draft regulations.

Deviation charge for under or over injection of solar power, for sale or self consumption of power within Tamil Nadu is as follows:

The deviation charge for under or over injection of wind power, for sale or self consumption of power within Tamil Nadu has been specified as follows: