Transcript Appropriate Market Structure of Regional Integration, Pool and

Appropriate Market Structure of
Regional Integration,
Pool and Exchange
Nepalese Perspective
Chandan Kumar Ghosh
Assistant Manager,
Nepal India Electricity Transmission and Trade Project
Nepal Electricity Authority, Durbarmarg, Kathmandu, Nepal
Hitendra Dev Shakya,
Director,
Large Power Generation, Operation and Maintenance
Nepal Electricity Authority, Durbarmarg, Kathmandu, Nepal
Introduction
• What should Nepal Consider
– A Market Favourable for Hydro Energy
• Characteristic of thermal vs hydro
• Why not a mix?
– In the SAARC Region?
• What should the Market encourage ?
• How to mitigate the risks associated in both
thermal and hydro?
Assumptions
• Surplus in Year 2016/17
• Crisis still in dry season
• At leastSome Cross-border Transmission Lines
across Nepal and India
• Load profile of Nepal would be quite similar to
the present load profile
• No Bias-Prejudice towards any particular
power source
Average Load Curve of Nepal
Hydro characteristics
• Nepal has mostly hydro installations for its power needs.
• Hydro Stations are highly capital intensive.
• Run-of-river type of Hydro power stations are popular
among developers.
• New Choice
– Peaking Run-of-River type
– Low Cost
• Storage type Hydro Power Stations
– minimal
• The demand for energy is soaring high in South Asia.
Hence, there is a good chance for Private or Public Sector to
enter the market.
Characteristics of a ROR:
• No Storage in a ROR
• Drawback from the market persepective
– cannot exploit the advantage of the demand and pricing of a
free market.
– need to sell its energy in realtime, or spill it
• Long term Contract,
– Take-or-pay Contract
– Monthly energy contract
– Suitable scheme to hedge its risk for the spill.
• Investment in ROR type with a small pondage
• Some Storage type projects for Seasonal deficit balance.
• PROR than ROR.
Characteristic of Nepalese Load Curve
• Peak Load is nearly double of the Base Load
• Duration of peak load
– normally 3 hours in the evening
– a few hours in the morning
• No major variance from Winter to Summer
• Demand almost the same during Summer and
Winter.
• Supply changes proportionately with the river
discharges.
• Market Design should addresses this issue.
Appropriate Market Structure
• Pool
– Like an Airlines Ticketing system
– Commit early, buy cheap, no cancellation
– Buy late, pay high or as per the demand
– And try your luck
• Exchange
– Bilateral treaty
– Power Diplomacy
Pricing Mechanism : Barter
• Same mechanism in Summer or Winter
• Barter system
– Additional surcharge for every transaction.
– Based on committed power and not surplus power.
– The cost of committed power is high in comparison to
surplus power
– Surplus power can be sold in a spot market as per
commercial tariff
Reliability and Quality Issues
• Reserves of real power and reactive power are
required
• strategically located
• Peaking ROR ramps up production during
sudden surges in Power Demand.
• Purchase or outsource reserves and
subsequently charge to system users on some
equitable basis.
• Health Insurance
Ancillary Services 1: Black Start
Capability
• Ancillary Services such as Black Start should also
be priced.
• Hydropower has that advantage
• Market should reward this advantage
• The reserve capacity of a hydrostation is usable in
1 or 2 mins, where as for a thermal, it can take a
half a day and for Diesel, 15 to 20 minutes at a
minimum.
• Reserve capacity of a Hydrostation should be
priced higher ?
Ancillary Services 2 : Reactive Power
• Voltage Support through reactive Power
Generation by power plants can come at the
cost of energy generation, ie, cost of fuel
• Market should encourage production of
reactive power production
• UI and ABT based mechanisms instead of
SPOT market could be a temporary measure
before Market establishment.
Ancillary Service 3 : Standing Reserve
• The market should encourage establishement
of unsynchronized, fast start-up plant (hydro,
gas turbine) whose energy can be made
available within 5 min or less.
• Hydro has a typical characteristics of a start-up
time of less than 2 mins and a minute in
average.
• Demand reduction as per operator’s
instruction can also be used in this category.
Ancillary Service 4 : Replacement
Reserve
• The market should also encourage
establishment of plants that can be brought
into service with longer notice in the event of
a shortfall in standing reserve.
• This could be termed hotstand by plant or
deferred-start plant, designated by System
Operator.
Ancillary Service 5 : Spinning Reserve
Margin
• Market should have provision for a fastresponse capability of a partially loaded
synchronized generators to check any sudden
frequency change due to loss of any
generation from a station. The response time
should be as less as possible to manage the
system surge averting collapses.
Nodal Pricing Mechanisms
• There are many cross border points between India and
Nepal.
• Likewise there could be many between India and
Bangladesh
• and so on between other bordering countries.
• The regional price can be different.
• For example, the cost of energy in North-East India
could be cheaper in comparison to the Eastern of
Central Region.
• The solution to the problem is a Nodal Pricing
Mechanism. It takes care of the Transmission Postage
Stamps (fixed surcharges).
Congestion Pricing and Contingency
• Price needs to be increased in congested
transmission lines
• Contingency Optimization:
• If one line of a generating station trips, there
should be reserve capacity of generation or
transmission.
• Pricing Signals for reserve capacity and
transmission capacity should be considered
while designing a market.
• Thank you
– [email protected]