Recently TSERC announced regulations on wind and solar forecasting, scheduling regulations, 2018. This is the final regulation and with this Telangana became the sixth, and latest, state to implement Forecasting and Scheduling regulations.
The detailed summary of the regulations is as below:
- Title of the Regulation: Telangana State Electricity Regulatory Commission (Forecasting, Scheduling, Deviation Settlement and Related Matters for Solar and Wind Generation Sources) Regulations, 2018.The Telangana Forecasting regulation has been finalized within two months of the release of draft regulation.
- From the date of publication in the official gazette.
- Forecasting tool to be established in three months period.
- Levy and collection of DSM Charges shall commence after six months from the date of publication in the official gazette.
- Regulation Applicable on: All grid-connected Wind and Solar Power Generators (except Rooftop PV Solar Power Projects) connected to a pooling substation of the capacity not less than 5 MW irrespective of commissioning date.
- Deviation Accounting: The deviation accounting will be carried out based on the Available Capacity:
- Absolute Error in % = 100 x Actual Generation – Scheduled Generation ⁄ Available Capacity (AvC)
- Point of Forecasting: Pooling Station or STU Feeder where the injection is made.
- Aggregation: Unlike in Karnataka and AP, Telangana’s order of F&S does not have a provision to provide an aggregated forecast.
- Role of a QCA:
- Provide day ahead, week -ahead schedule generator wise and aggregated schedule for each pooling station and the periodic intraday revisions.
- Coordination with DISCOM/STU/SLDC for metering, data collection, communication/issuance of dispatch/curtailment;
- Provide day ahead, week- ahead schedule generator wise and aggregated schedule for each pooling station and the periodic intraday revisions.
- De-pooling of charges among generators:
- Commercial settlement of DSM charges on a weekly basis and
- All other ancillary and incidental matters.
- 16 revisions are permitted for Wind Generators starting from 00:00 Hrs of the day.
- 9 revisions are permitted for Solar Generators starting from 05.30Hrs of the day.
- All the revisions are effective from the 4th time-block.
- Other Key Points:
- DSM Settlement will be done on a Weekly basis, with Meter data to be provided by SLDC, and verification to be done in coordination with SLDC.
- After recovering DSM amounts, if there is a gap between the actual commercial impact for the state as a result of deviation of wind and solar generation, such amount will be further recovered from each generator.
- The wind and solar generator or the QCA will provide payment security to SLDC by the way of BG or revolving LC which will cover the DSM payment for 6 months.
- De-pooling will be done in proportion to energy injected in each time block by each generator.
- The QCA will only be forecasting on PSS level. Aggregation to create a virtual pool/aggregate of multiple substations is not allowed. States like A.P and Karnataka have allowed Aggregation in their final regulations.
- Important differences between intrastate and interstate transactions:
- The deviations for Inter-State and Intra-State transactions at Pooling Station will be accounted for separately. Separate schedules have to be sent for the interstate to SLDC and RLDC.
- The Inter-State transactions will be settled on the basis of their scheduled generation and will be considered only if the Inter-state capacity is connected to the STU via the separate feeder.
- The Generator will pay the Deviation Charges for under or over injection applicable within Telangana in case of deviations in the State DSM Pool.
Deviation Charges in case of under or over-injection for sale/supply of power within the State
|DSM Charges Payable to State Pool Account|
|2||>15% but ≤ 25%||At Rs. 0.50 per unit|
|3||>25% but ≤ 35%||At Rs. 1 per unit|
|4||>35%||At Rs. 1.50 per unit|
Deviation Charges in case of under or over-injection for sale/supply of power outside the State
Inter-state Deviation Charges will follow the same mechanism as defined by CERC (PPA linked). However, the final deviation settlement for Inter-state generators shall be done by SLDC on the basis of deviations and its impact at state periphery.
The TSERC Regulation for Forecasting & Scheduling, 2018 has provided a summary of timelines designating the activities to QCA and SLDC, to be accomplished within the following stipulated duration.
|Sr. No.||Activity/Milestone||Action By||Duration (Months)|
|1||Technical Specification and Information Sharing protocol by QCA to SLDC||SLDC||3|
|2||Forecasting tool, alternate means of communication, formats for submission||SLDC||3|
|3||Forecasting tools to be established by QCAs||QCA||3|
|4||Guidelines for registration of QCA, data exchange between QCA and SLDC||SLDC||2|
|5||Manner of making State Pool Account and settlement thereof||SLDC||3|
|6||Detailed Procedures covering plan for data telemetry||SLDC||3|
|7||Trial Run –During this period all parties shall comply with the above||All||6|
|8||Commencement of commercial arrangement.||All||6|