AVAILABILITY BASED TARRIF (ABT)
Availability Based Tariff (ABT) is a frequency based pricing mechanism for electric power. The ABT falls under electricity market mechanisms to charge and regulate power to achieve short term and long term network stability as well as incentives and dis-incentives to market participants against deviations in committed supplies as the case may be.
ABT Mechanism (Energy policy of India) is adopted in India (ABT Order dated January 2000 of CERC) and in a few
other countries for pricing bulk power across various stakeholders. ABT
concerns itself with the tariff structure for bulk power and is aimed at
bringing about more responsibility and accountability in power generation and
consumption through a scheme of incentives and disincentives. As per the
notification, ABT was initially made applicable to only central generating
stations having more than one SEB/State/Union Territory as its beneficiary.
Through this scheme, the Central Electricity Regulatory Commission (CERC) looks forward to improve the quality of power and control the following disruptive trends in power sector:
Through this scheme, the Central Electricity Regulatory Commission (CERC) looks forward to improve the quality of power and control the following disruptive trends in power sector:
· 1. Unacceptably rapid and high frequency deviations
(from 50 Hz) causing damage and disruption to large scale industrial consumers
·
2. Frequent grid disturbances resulting in
generators tripping, power outages and power grid disintegration.
**The ABT scheme has now been expanded
to cover the Intrastate systems as well.
What is availability?
'Availability', for the purpose of the ABT Order
means the readiness of the generating station to deliver ex-bus output
expressed as a percentage of its related ex-bus output capability as per rated
capacity.
How is
availability calculated?
“Availability of thermal generating station for any
period shall be the percentage ratio of average SOC for all the time blocks
during that period and rated Sent Out Capability of the generating station”
SCHEDULING
1. Each
day of 24 hours starting from 00.00 hours be divided into 96 time blocks of 15 minutes each.
2. Each
generating station is to make advance declaration of its capacity for
generation in terms of MW hr delivery ex-bus for each time block of the next day.
In addition, the total ex-bus MW hr which can actually be delivered during the
day will also be declared in case of hydro stations. These shall constitute the
basis of generation scheduling.
3. While
declaring the capability, the generator should ensure that the capability
during peak hours is not less than that during other hours.
4. The Scheduling
as referred to above should be in accordance with the operating procedures in
force.
5. Based on the
above declaration, the Regional Load Dispatch Centre (RLDC) shall communicate to
the various beneficiaries their respective shares of the available capability.
6. After
the beneficiaries give their requisition for power based on the generation
schedules, the RLDC shall prepare the generation schedules and drawal schedules
for each time block after taking into account technical limitations and
transmission constraints.
7. The
schedule of actual generation shall be quantified on ex-bus basis, whereas for
beneficiaries, scheduled drawals shall be quantified at their respective
receiving points.
8. For calculating
the drawal schedule for beneficiaries, the transmission losses shall be
apportioned in proportion to their drawls.
9. In case of any
forced outage of a unit, or in case of any transmission bottleneck, RLDC will
revise the schedules. The revised schedules will become effective from the 4th
time block, counting the time block in which the revision is advised by the
generator, to be the 1st one.
10. It is also
permissible for the generators and the beneficiaries to revise their schedules
during a day, but any such revisions shall be effective only from the 6th time
block reckoned in the manner as already stated.
ABT FEATURES
1. ABT
brings about enhanced grid discipline.
2. Economically viable power with right pricing.
3. Promote competition and
efficiency.
4. Encourage use of Merit Order Dispatch / Economic Dispatch in India.
5. Addressing grid
disturbance issues.
6. Gaming
and avoiding the same.
7. Requires special meters, remote metering
with open protocols and communication mechanisms to read meters timely.
8. Software that is comprehensive to do
calculations, address regulatory issues and modifications as per different
Regulatory Commission requirements.
9. Interface options to various
stakeholders in the ABT mechanism online to enable effective implementation and
benefits to all.
10. Capability of power producers to be able
to control their cost of production as well as flexibility in operations.
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