Tim Olson
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62 lines
3.6 KiB
Markdown
62 lines
3.6 KiB
Markdown
---
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description: "Capture or hedge the gross margin of a gas-fired power plant by trading the spread between wholesale electricity prices and natural gas fuel costs, using electricity and gas futures in the ratio determined by the plant's heat rate."
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tags: [miscellaneous, energy, spread-trading, hedging, commodities]
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---
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# Energy — Spark Spread
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**Section**: 14.4 | **Asset Class**: Miscellaneous (Energy Commodities) | **Type**: Spread Trading / Hedging
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## Overview
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The spark spread is the difference between the wholesale price of electricity and the price of natural gas required to produce it. It measures the gross margin of a gas-fired power plant (excluding all other costs: operation, maintenance, capital, etc.). A spark spread position is built by taking a short position in electricity futures and a long position in natural gas futures, in the ratio determined by the plant's heat rate.
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## Construction / Mechanics
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**Heat rate** (fuel efficiency of the power plant):
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```
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H = Q_F / Q_E (516)
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```
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- `Q_F` = amount of fuel (natural gas) used, measured in MMBtu
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- `Q_E` = electricity produced, measured in MWh
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- `H` measured in MMBtu/MWh
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- MMBtu = 1,000,000 Btu; Btu ≈ 1,055 Joules
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**Spark spread** (in $/MWh):
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```
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S = P_E - H × P_F (517)
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```
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- `P_E` = price of electricity ($/MWh)
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- `P_F` = price of natural gas ($/MMBtu)
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**Hedge ratio** for futures contracts:
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```
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h = H × F_E / F_F (518)
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```
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- `F_E = 736 MWh` (standard electricity futures contract size)
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- `F_F = 10,000 MMBtu` (standard natural gas futures contract size)
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Since `h` is generally not a whole number, it is approximated as the ratio `h ≈ N_F / N_E` with the lowest possible whole-number denominator `N_E`. The hedge consists of buying `N_F` gas futures contracts for every `N_E` sold electricity futures contracts.
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## Return Profile
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- **Electricity producer (natural hedge)**: short electricity futures + long gas futures locks in a fixed spark spread, hedging against a compression of the gross margin
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- **Speculator / spread trader**: profits if the spark spread widens (electricity prices rise relative to gas prices) on a long spread position, or if it narrows on a short spread position
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- The strategy has no directional energy price exposure — only exposure to the relative price of electricity vs. natural gas
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## Key Parameters / Signals
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- **Heat rate `H`**: plant-specific efficiency; lower `H` = more efficient plant = higher spark spread for the same fuel cost
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- **Spark spread `S`**: core signal; compare to historical average or fair value based on plant operating costs
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- **Contract sizes `F_E`, `F_F`**: determine the achievable hedge ratio granularity
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- **Seasonal patterns**: electricity demand (and spark spread) exhibits strong seasonality driven by heating/cooling demand
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## Variations
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- **Dark spread**: same concept for coal-fired power plants (replaces natural gas with coal prices)
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- **Quark spread**: same concept for nuclear power plants
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- **Clean spark spread**: adjusts for carbon emission costs (CO2 allowance prices) in addition to fuel costs
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## Notes
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- The spark spread measures gross margin only; it does not account for fixed operating costs, maintenance, or capital expenditures
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- Basis risk exists between the price indexes referenced in futures contracts and the actual spot prices at the delivery location
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- Liquidity is concentrated in front-month contracts; longer-dated spark spread trades may have wide bid-ask spreads
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- Heat rates vary with plant load and ambient temperature; a single fixed `H` is an approximation
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- Regulatory risk: electricity markets are often heavily regulated; price caps and dispatch rules can affect realized spreads
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