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Balancing the energy market in real time

Real time electricity markets provide a mechanism for Discoms to access a larger market at competitive prices. At a national level they can help utilize surplus capacity, and effectively manage diversity in demand. In India, RTM was launched on June 1, 2020, by RK Singh - minister for Power and New & Renewable Energy, making it one of the few nations that have such a market.

What is Real Time Market? 

Real-time electricity markets (RTM) are non-discriminatory transaction platforms that can be used for balancing the energy market. In this the market-clearing price is very close to real-time operations of power systems. One of the main functions of RTMs in modern power systems is establishing an efficient and effective mechanism for maintaining the balance in market participation for Distributed Energy Sources, while handling their intermittent characteristics, facilitating asset utilization, and stimulating their active responses. Consequently, RTMs are dedicated to maintaining the flexibility and reliability of power systems.

Delivery period for RTM will be a half-hourly market. Buyers/sellers would have the option of placing buy/sell bids for each fifteen-minute time block in the given half-hourly RTM block. And the price discovery mechanism would be double-sided, closed auction a uniform price, similar to existing mechanism in Day Ahead Market (DAM).

The Draft Regulations were issued on August 6, 2019. After public comments, the final notification became public on December 12, 2019. Other regulations amended to make it operational are: Central Electricity Regulatory Commission (Indian Electricity Grid Code) (Sixth Amendment) Regulations, 2019; Central Electricity Regulatory Commission (Open Access in inter-State Transmission) (Sixth Amendment) Regulations, 2019; and Central Electricity Regulatory Commission (Power Market) (Second Amendment) Regulations, 2019. RTM was earlier going to start on April 1, 2020, but due to the COVID-19 situation, June 1, 2020 as decided as the new date for RTM to be operational.

Need of Real Time Market 

India has the benefit of an abundance of RE and is also planning to add more of RE to its portfolio, making it difficult for utilities to manage. Therefore, by introducing real-time power market we can deal with the renewable interference and Discom / Generators can manage their power portfolio in a better manner. With more and more RE capacity being added, there will be sudden ramp up and down in the system. The consumers or the Discoms can plan their energy supplies in a better way and generators will be able to increase or decrease their output accordingly. Under the RTM, there will be 48 sessions of half-hour each in a day. It means that trading of electricity would be done round the clock. After closing of the hour-on-hour session, the power delivery can be scheduled at an interval of one hour.

If a consumer buys power in the 11.30 am-11:30 am to midnight session, the electricity supply can be scheduled as early as 1 pm on the same day.

Timelines 

Auction Start Time RTM Auction End Time RTM Clearing Interval Communication with RLDC/ SLDC and Schedule PreparationDelivery Period  (Delivery on the Same Day, MCP and MCV will be discovered for each
15 minute block)
22:30 Hrs (of the previous day 23:00 Hrs (of the previous day) 23:00 Hrs – 23:30 Hrs (of the previous day) 23:30 Hrs – 24:00 Hrs00:00:00 – 01:00:00
23:30 Hrs (of the previous day00:00 Hrs (of the delivery day)00:00 Hrs – 00:30 Hrs00:30 Hrs – 01:00 Hrs01:00:00 – 02:00:00
07:30 Hrs08:00 Hrs08:00 Hrs – 08:30 Hrs)08:30 Hrs – 09:00 Hrs09:00:00 – 10:00:00
21:30Hrs22:00Hrs22:00 Hrs – 22:30 Hrs22:30 Hrs – 23:00 Hrs23:00:00 – 00:00:00

Procedure 

The RTM is designed based on Intra Day Market Mechanism as follows.

  • The market is based on double-sided closed auctions with uniform market clearing price
  • The RTM is conducted once every hour for delivery in four fifteen-minute blocks in each hour
  • RTM will work in given timelines (as shown in the Timelines table below)

For operationalizing RTM, the schedules decided at the end of RTM clearing are both financially and physically binding.

Source: CERC Staff

For this, the concept of Gate Closure is introduced. For each fifteen-minute block in one hour, those with demand for electricity or Discoms or traders will assess in advance what the demand will be. They'll then place their bids in the RTM for that volume of electricity. Similarly generators/ traders will place their offers. To ensure firmness of such bids and offers, the gate for schedule revision will close before the start of the auction, as depicted in Figure 1. In this illustration, the gate for schedule revision for the hourly trade for 00.00 – 01.00 Hrs closes at 22.30 Hrs of the previous day. The auction is conducted for the delivery period 00.00 – 01.00 Hrs. This process is continued every hour thereafter. The gap between gate closure and delivery period will be reduced gradually as automation of the process improves.

Source: CERC Staff

Benefits of RTM for the Discoms 

In India all the states are tied up with long-term contracts for supply of power at higher rates. For fulfilling their peak load demand most states run their own plants during this period and for rest of the day these plants run at technical minimum because of which operation costs becomes high. But after the introduction of power exchange and DAM, these states are able to reduce this burden by replacing this costly generated power. It has been estimated that if each state were to replace its costly generation with cheaper resources available (in Real Time) in other states, the total daily power purchase cost of the country would reduce substantially. It is expected that liquidity in the proposed RTM will increase because of the design change in the form of auction and gate closure.

With introduction of RTM market generators have now the mechanism to participate and share the net gains with Discoms for their un-requisitioned capacity. On the other handDiscoms can now plan their power purchase more effectively and close to the real time as they have more competitive price available in the market.

Currently Discoms have the right to recall four time blocks ahead of actual dispatch. Once the RTM with gate closure is introduced, the flexibility to revise schedule will change. While the gap between gate closure and delivery period will be reduced with automation of the process. By introduction of RTM, Discoms will benefit on the following counts:-

  1. The Discoms would have access to larger pool of generation resources to meet their contingent requirement in real time as against the existing bilateral resources (under the right to recall) to meet contingencies
  2. Prices discovered in RTM are likely to be more efficient then bilateral arrangement under the right to recall
  3. The Discoms themselves can sell the surplus power from their contracted generation sources in the real time market and earn the revenue in full.
Author : Padmini
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