Generation Support and Bulk Storage Services
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1
Arbitrage
Practice of taking advantage of an electricity price difference in the wholesale electricity market. It is the use of storage to buy energy at a low price and sell it at a high price.
2
Support to Conventional Generation (emerging service)
Support to conventional generation is related to optimising the operation of conventional generation assets:
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Generator bridging: the ability of energy storage systems (ESS) to pick up a generator load while the generator is stopping, until a new generator starts up or the same generator is restarted. ESS can also avoid stopping the unit (and the associated starting costs) by charging in moments of low load.
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Generator ramping: the ability of ESS to pick up strong and fast load variations, giving enough time for a given generator to ramp up or down its production level according to the optimal technical recommendations to meet load variation at stake.
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Hedging imbalance charges due to deviations of final physical notifications.
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Provision of mandatory services (e.g. frequency control), but also apply for bids in the market.
3
Ancillary Services RES Support (emerging service)
The use of energy storage to help variable renewable generation contribute to ancillary services by keeping some reserve power, thus “wasting” a part of the down regulation of non-dispatchable RES.
4
System Electric Supply Capacity (emerging service)
Use of energy storage to provide the system with peak generation capacity.
5
Capacity Firming (emerging service)
Use of energy storage to render variable RES output more constant during a given period of time. Energy storage is used to store variable energy production (e.g., wind or solar) during hours of peak production regardless of demand. This energy is then discharged to supplement generation when the variable energy unexpectedly reduces its output.
6
RES Curtailment Minimization (emerging service)
Use of energy storage to absorb variable RES (wind or
solar) that cannot be injected into the electricity grid due to lack of demand or transmission capacity, either delivering it to the electricity grid when needed or converting it into another energy vector (gas, fuel or heat) to be delivered to the relevant grid.
7
Seasonal Arbitrage (future service)
The practice of taking advantage of an electricity price difference in
the wholesale electricity market between two seasons: Use of storage to charge energy at low price in summer and discharge it at high price in winter.
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