Green Markets

A new opportunity for renewable energy generators

Ravi Kuchi, Vice-President, Business Development, Indian Energy Exchange Limited

The Indian power sector is undergoing a paradigm shift with rapidly in­creasing renewable capacity addition in the system. Renewable electricity generation has seen over 15 per cent compound annual growth rate over the last few financial years (2016-17 to 2021-22) vis-à-vis a total growth of around 3.5 per cent. India now boasts of the largest installed renewable energy capacity of more than 150 GW (comprising 106 GW renewable electricity and 46.5 GW hy­dro) and has set a target of achieving 500 GW of renewable energy capacity by 2030, in addition to meeting 50 per cent of its energy requirements from renewable energy.

This expedited growth has been possible due to a favourable policy environment, aided by technological innovations, whi­ch have resulted in falling cost curves and renewables achieving/surpassing grid parity. The capacity addition in re­ne­wables is primarily driven by long-term PPAs of discoms, either through the competitive route or the earlier feed-in tariff mechanism. However, as the pe­ne­tration of renewables in the grid inc­reases, new technological and market-based solutions are essential for renewable energy integration and absorption. While hybrid plants (with or without different storage technologies) and distributed solutions are already progressing on the technological front, the recent ad­vent of market-based solutions is pro­viding immense value to renewable en­ergy buyers and sellers, facilitating co­m­petitive, transparent and flexible po­wer procurement, with certainty of sc­hedule and time-bound payments.

The exchange-led electricity and renewable energy market provides a diverse spectrum of market-based products and contracts. They include the real-time ma­r­ket (RTM), which began in June 2020, the green term-ahead market (GTAM) launched in August 2020 and the green day-ahead market (GDAM) launched in October 2021. Dis­co­ms now have access to real-time exch­an­ge-discovered prices to make optimal buy-sell decisions. Also, renewable energy-surplus state discoms, renewable energy generators without PPAs/with expired PPAs, generators who commissioned prior to their scheduled dates, etc., can now monetise their surplus en­er­gy immediately and help their counterparts in meeting their renewable purchase obligations (RPOs). With benefits such as transparency and flexibility in procurement that the exchange market segments offer, a pan-Indian green market is facilitating obligated entities such as discoms, open access consumers and captive power plants in fulfilling their RPOs at competitive prices.


India’s first exclusive green electricity ma­rket commenced at Indian Energy Ex­change Limited (IEX) on August 21, 2020. This market now offers options to trade in green electricity for time durations varying from same-day delivery to delivery up to 11 days.

Key observations

  • An excellent response has been re­ceived from the market, considering that there has been no pure-play merchant capacity in the renewable segment, to begin with. It must be noted that volumes have increased in financial year 2022 due to the capture of the entire high wind season and in­creased liquidity with participation from renewable generators and buyers (100 plus participants in financial year 2022).
  • Sell side volumes are primarily contributed by Karnataka and Telangana discoms since they can manage their renewab­le energy surplus on the basis of their portfolio and the prevailing su­pply-dema­nd scenario of the res­pec­tive states. However, there has been a gra­dual increase in the number of generators that are participating in this market (50 plus currently).
  • Buy-side volumes are driven by RPO and voluntary targets taken by certain customer segments. Apart from disco­ms in Bihar, Haryana, West Bengal and Delhi, who look for optimal price poin­ts, significant open access volumes ha­ve come from the state of Odisha, whi­ch offered waiver of cross-subsidy su­rcharge as well as applicability of only 20 per cent intra-state transmission and wheeling char­ges for the purchase of green power. Due to these wai­vers, open access consumers in Odisha such as Vedanta, JSL and SAIL have purchased significantly in these markets. These waivers have been discontinued from April 1, 2022.
  • The market subsegments with maximum liquidity – of around 90 per cent – are day-ahead contingency and intra-day as buyers, in particular, industrial customers look for varying demand profiles that can be forecasted near to delivery, while sellers also prefer to rely on more reliable short-term forecasting to avoid deviation settlement me­chanism penalties. The price discovery and matching of bids is based on “Continuous Trade” for intra-day, day-ah­ead contingency and daily contracts and “Uniform Price Step Open Auc­ti­on” for weekly contracts.
  • Market price trends of the DAM, RTM, so­lar and non-solar GTAM prices sho­wn below indicate the synchronism and convergence of all these markets and the premium commanded by renewable power in normal scenario (except in high-price periods). Premi­um for the non-solar segment is generally higher than that of solar since with the former, power is available round-the-clock (RTC) including peak hours or in a higher number of time blocks compared to the latter. This RTC availability is on account of the major seller of non-solar power being karnataka discoms that can offer RTC power from their portfolio of non-solar assets (wi­nd, small hydro, biomass etc.), which better suits the requirements of buyers. Further, a couple of small-hydro and seasonal cogeneration plants also offer higher daily plant load factor vis-à-vis solar power.

HPO and GTAM-hydro

The Central Electricity Regulatory Com­mission (CERC), vide its order dated Feb­­ruary 2022, approved the introduction of hydropower contracts in the GTAM at the IEX to facilitate hydropower purchase obligation (HPO) compliance of obligated entities. The IEX is in the process of laun­ching this market segment shortly.

  • The obligated entities procuring rene­wable energy through hydropower contracts through the proposed separate window in the GTAM shall be eligible to meet their HPOs.
  • Similar subsegments and market rules for hydro (solar, non-solar).
  • Hydropower plants, com­mi­ssioned on and after March 8, 2019 and up to Ma­r­ch 31, 2030 and having an install­ed capacity greater than 25 MW would be able to participate in hydro contracts of the GTAM.
  • Till now seven states have issued final HPO regulations – Delhi, HP, Harya­na, Rajasthan, Uttar Pradesh, Odisha and Kerala. Eight states have come out with draft regulations – Chandi­garh, Ch­hattisgarh, Daman & Diu, DNH, Goa, Gujarat, Puducherry and Assam.


The GDAM segment commenced at the IEX on October 26, 2021, as part of the integrated DAM, where discoms and consumers can fulfil their green power requirements in collective markets. Whi­le all other processes remain the same, the market volume and price discovery are prioritised for green bids. Bidders have the option to bid for rene­wable and conventional power separately and additionally, participants can carry forward uncleared bids from the green market into the conventional market at a premium – or discount – as they deem fit. As on March 31, 2022, the market has accomplished a trade of 920.4 MUs, with an average daily buy of 21.6 MUs and an average daily sell of 11.6 MUs, with an average market clearing price of Rs 5.29 per kWh.

With the advent of the GDAM, currently, renewable energy generators and sellers have got all options to participate in the market. Further, the RTM, with its excellent liquidity, is functioning as the market of last resort. As a case in ha­nd, there are certain renewable energy generators who are bidding under both the GTAM and GDAM segments and are clearing the uncleared volume in the RTM, acting as a price taker.

Green market enablers

Although the performance of green markets has been promising, the following market enablers will go in a long way in making the market realise its full potential:

  • ISTS waiver implementation: The Mi­ni­stry of Power, vide its order dated Ju­ne 21, 2021, has waived off ISTS ch­ar­­ges for power traded in the GTAM and GDAM till June 30, 2023. How­ever, the sa­me is yet to be implemented by the CERC.
  • Dynamic interchangeability between green power and REC: Currently, only non-renewable energy certificate (REC) generators can participate in green markets and no REC gets acc­rued to sellers when the bid is carried forward from the green market to the conventional market. Providing such flexibility will go a long way in increasing market liquidity as well as options for renewable energy generators, whi­ch would result in more trust on the market/merchant route for renewable energy generation.
  • Fungibility among different categories of RECs: The recent draft of the CERC REC regulations indicates multipliers among RECs based on different technologies. However, clarity is re­­quired over fungibility in RPO compliance as well.
  • Allowing renewable energy generators to buy from RTM to manage renewable energy intermittency.
  • Uniform forecasting and scheduling (F&S) regulations: Currently, 18 states have issued their F&S regulations, whi­ch are indispensable for better day-ahead scheduling of demand/ generation and effective grid operation. It is to be implemented in all states.
  • RPO compliance: Although there has been an outstanding increase in the percentage of renewable energy in the country’s energy mix, the RPO com­plian­ce targets of many states and ca­ptive customers are still not met.
  • Parity for market-based option: Ava­il­ability of renewable energy ban­k­ing and various waivers given at intra-state renewable energy generation im­pedes optimal market develo­p­me­nt. As mentioned earlier, markets provide a better route for renewable en­ergy integration and these should be at least treated at par, if not with more priority.

The way forward

The introduction of exchange-based gr­een markets, along with RTM, and their encouraging performance in terms of liquidity, competitive price discovery and premium commanded by the green market segments , has built a strong case for bringing more merchant renewable capacity into the system.

Green markets provide a better route for renewable integration and will help ac­hieve the target of 25 per cent share from spot markets, as mentioned in the draft National Electricity Policy, 2021.

Further, markets act as a stepping stone for new green power procurement mo­dels being envisaged – such as virtual PPAs and contracts for difference – and have the potential to fast-forward ad­va­n­­­ces in renewable energy forecasting algorithms, which will help address the key concern of buyers and grid operators, which is the unpredictability of gr­een generation.

In the long term, significant renewable purchase compliance targets, coupled with voluntary green targets committed to by a whole host of industrial and commercial customers, will continue to act as a driver for green merchant capa­city ad­dition. The above-mentioned market en­ablers and support from the lending co­mmunity will go a long way in meeting India’s ambitious renewable targets. N



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