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E-StorMTM forms a part of our EnergyMetricsTM suite of energy risk management and forecasting models used by NERA to help our clients with valuation and decision-making in connection with a range of energy assets, including gas storage, merchant power plants (thermal and hydro), interconnectors, and contracts (plain vanilla, options, swings, swaps, etc.). The power of EnergyMetricsTM is its ability to assess the aggregated risk and return of a mixed portfolio of different assets taking into account stochastic nature of prices for power, fuels, and CO2, as well as other variables. Combined with our expertise in the fundamental economics and competitive dynamics of energy markets, this powerful tool allows us to give clients an independent and insightful appraisal, not just mechanistic modeling results or software solutions. A screenshot of the main EnergyMetricsTM user interface is illustrated below.
Click image to enlarge
E-StorMTM is a general option valuation model applicable to many types of commodities, but here we highlight its application to gas storage valuation. Rather than optimizing with "perfect foresight," E-StorMTM recognizes that the users of storage have to decide what to do on each day in conditions of uncertainty about future price evolution, as illustrated in the graph below.
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The model decides the optimal action each day (i.e., inject, withdraw, or do nothing), based on a probabilistic assessment of the expected value of the storage at the end of the day conditional on each choice (i.e., with more, less, or the same gas in store). To do so the model estimates an expected "continuation value" of the storage at the end of the day, which depends on the current spot price and the level of gas in store, as illustrated in the graph below. The model then picks the action that maximizes the expected sum of today's profit and the continuation value.
Click image to enlarge
The following steps summarize the algorithm used by E-StorMTM.
Step-By-Step Summary
The model uses the following step-by-step procedure:
Set the values for the following "Terminal Conditions for the end of the modeling period (period t):
4. Step back one period and calculate expected continuation values for each of the N prices at period (t-1):
5. Step back one period and repeat the calculations and regressions for period (t-2).
6. Repeat the process back to the current day.
7. Calculate the net revenues derived from the optimal series of actions for each price path.
The combination of the best actions on each day, for each price path, amounts to a series of energy trades (inject/withdraw/nothing = buy/sell/no trade) at the current spot price (adjusted for the costs of injection and withdrawal). The revenue stream to be earned from the storage is the sum of net revenues from these trades, which can be discounted to provide an NPV. With N price paths, we obtain N possible revenue streams and NPVs. We take the mean annual revenue in each year divided by the space of the facility as our prediction of the market price of the storage capacity.
Contacts
Sean Gammons
Managing Director
NERA London
+44 20 7659 8564
sean.gammons@nera.com
Vakhtang Kvekvetsia
Associate Director
NERA London
+44 20 7659 8746
vakhtang.kvekvetsia@nera.com
Name | Title | Location | Phone | |
---|---|---|---|---|
Sean Gammons | Senior Managing Director |
London
Berlin |
+44 20 7659 8564
+49 30 700 1506 01 |
sean.gammons@nera.com |
Vakhtang Kvekvetsia | Managing Director | London | +44 20 7659 8746 | vakhtang.kvekvetsia@nera.com |
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