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above table shows how Grid frequency has been the renewable generations are weather dependent upto
improved and the standard deviation from 50.0 Hz has some extent. Hence, this can be understood that with this
been reduced over time after implementing DSM and its continuous penetration of Renewable energy sources,
amendments. the chances of deviation from rated frequency will also
rise. Also, solar energy does not provide any inertia and
CONCLUSION thus reducing effective inertial stability of grid. Hence
some mechanism apart from DSM regulation will be
The Ministry of New and Renewable Energy (MNRE), required to ensure grid stability. In this regard, CERC has
Government of India, has a continuous thrust for the felt the need for a comprehensive regulatory framework
growth and development of renewable energy (RE) on Ancillary Services and accordingly has placed the draft
sector in the country for achieving the target of 175 to CERC (Ancillary Services) Regulations, 2021 (in short,
GW of renewable energy by 2022, with solar capacity of ‘the draft Ancillary Services Regulations’). This regulation
100 GW. provides measures for maintaining grid frequency within
allowable band to support reliable and stable operation
Under Section 86(1) (e) of the Electricity Act 2003 (“EA of the grid, by employing Ancillary Services. The Ancillary
2003”) and the National Tariff Policy 2006, Renewable Services mechanism is basically about controlling the
purchase obligation (RPO), is a mechanism by which generation of generating units on real time as per
the obligated entities are obliged to purchase certain requirement for adhering to grid stability (Generation
percentage of electricity from Renewable Energy may be ramped up for frequency below 50 Hz and it
sources, as a percentage of the total consumption of may be ramped down for frequency higher than 50 Hz).
electricity. RPOs are categorized as Solar and Non Solar Generation control can be achieved initially through
RPO. With the objective to achieve the target of 175 GW automatic generation control by generating units. In
of renewable energy by 2022, including solar energy case of further requirement, the Un-scheduled reserve
capacity of 100 GW, Ministry of Power have notified the generation available from various generating units may
target RPO trajectory up to year 2022. The RPO targets be used in order to address any real time situation in our
specified for solar and non-solar power are to be adhered national grid.
and met uniformly by the Obligated Entities of all the
States and Union Territories. Obligated Entities (which However, we are looking forward to meet the challenges
includes Discoms, Open Access Consumers and Captive in near future in an effective and efficient way.
power producers) are obligated to purchase a minimum
share of their electricity from renewable energy sources ABBREVIATIONS
as per RPO targets.
ABT: Availability Based Tariff
With this significant rise of renewable generation in our
national grid, the risk of frequency getting deviated from ACP: Area Clearing Price
the rated frequency of 50 Hz will also increase because
CERC: Central Electricity Regulatory Authority
DAM: Day Ahead Market
DSM: Deviation Settlement Mechanism
LTOA: Long term Open access
MNRE: Ministry of New and Renewable Energy
MTOA: Medium Term Open Access
90
improved and the standard deviation from 50.0 Hz has some extent. Hence, this can be understood that with this
been reduced over time after implementing DSM and its continuous penetration of Renewable energy sources,
amendments. the chances of deviation from rated frequency will also
rise. Also, solar energy does not provide any inertia and
CONCLUSION thus reducing effective inertial stability of grid. Hence
some mechanism apart from DSM regulation will be
The Ministry of New and Renewable Energy (MNRE), required to ensure grid stability. In this regard, CERC has
Government of India, has a continuous thrust for the felt the need for a comprehensive regulatory framework
growth and development of renewable energy (RE) on Ancillary Services and accordingly has placed the draft
sector in the country for achieving the target of 175 to CERC (Ancillary Services) Regulations, 2021 (in short,
GW of renewable energy by 2022, with solar capacity of ‘the draft Ancillary Services Regulations’). This regulation
100 GW. provides measures for maintaining grid frequency within
allowable band to support reliable and stable operation
Under Section 86(1) (e) of the Electricity Act 2003 (“EA of the grid, by employing Ancillary Services. The Ancillary
2003”) and the National Tariff Policy 2006, Renewable Services mechanism is basically about controlling the
purchase obligation (RPO), is a mechanism by which generation of generating units on real time as per
the obligated entities are obliged to purchase certain requirement for adhering to grid stability (Generation
percentage of electricity from Renewable Energy may be ramped up for frequency below 50 Hz and it
sources, as a percentage of the total consumption of may be ramped down for frequency higher than 50 Hz).
electricity. RPOs are categorized as Solar and Non Solar Generation control can be achieved initially through
RPO. With the objective to achieve the target of 175 GW automatic generation control by generating units. In
of renewable energy by 2022, including solar energy case of further requirement, the Un-scheduled reserve
capacity of 100 GW, Ministry of Power have notified the generation available from various generating units may
target RPO trajectory up to year 2022. The RPO targets be used in order to address any real time situation in our
specified for solar and non-solar power are to be adhered national grid.
and met uniformly by the Obligated Entities of all the
States and Union Territories. Obligated Entities (which However, we are looking forward to meet the challenges
includes Discoms, Open Access Consumers and Captive in near future in an effective and efficient way.
power producers) are obligated to purchase a minimum
share of their electricity from renewable energy sources ABBREVIATIONS
as per RPO targets.
ABT: Availability Based Tariff
With this significant rise of renewable generation in our
national grid, the risk of frequency getting deviated from ACP: Area Clearing Price
the rated frequency of 50 Hz will also increase because
CERC: Central Electricity Regulatory Authority
DAM: Day Ahead Market
DSM: Deviation Settlement Mechanism
LTOA: Long term Open access
MNRE: Ministry of New and Renewable Energy
MTOA: Medium Term Open Access
90
