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= Fuel Costs and Maintenance for Reactions =
Fuel costs and maintenance are one of the most overlooked parts of reaction industry in EVE Online. Many players calculate input and output prices carefully, but completely ignore the ongoing cost of keeping their industrial structures running.

For reaction operations—especially large-scale reaction farms—fuel is not a background expense. It is a '''core operating cost''' that directly affects ISK/hour profitability.
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= Why Fuel Costs Matter in Reactions =
Every reaction takes place in a structure, usually a refinery. That structure is not free to operate.<blockquote>If your structure is running, it is consuming fuel—even if no one is actively paying attention to it.</blockquote>This means:

* Idle infrastructure still costs ISK
* Poorly managed setups lose profit daily
* Large farms scale fuel costs dramatically

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= What Fuel Is Used For =
Fuel is required to keep industrial structures online and functional.

== In reaction industry, fuel is used for: ==

=== 1. Structure Operation ===
Keeps the refinery active in space.

* Allows modules to function
* Enables reaction jobs
* Maintains services

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=== 2. Service Modules ===
Reaction facilities depend on active services such as:

* Reprocessing
* Reactions
* Industry services

Each module contributes to fuel consumption.
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=== 3. Defense Systems (Optional but common) ===
Many industrial structures also maintain:

* Shields
* Armor repair systems
* Standup modules

These also increase fuel usage indirectly.
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= What Fuel Blocks Are =
Fuel is primarily consumed in the form of:<blockquote>'''Fuel blocks'''</blockquote>These are manufactured items made from PI products and ice products.
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== Typical fuel inputs include: ==

* Oxygen
* Coolant
* Mechanical parts
* Enriched uranium
* Isotopes
* Heavy water
* Liquid ozone

These are all industrial commodities with their own market value.
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= How Fuel Costs Affect Reaction Profit =
Fuel introduces a '''constant ISK drain per structure per hour'''.
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== Key impact areas: ==

=== 1. Reduces Net Margin ===
Even profitable reactions lose ISK to fuel consumption.
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=== 2. Forces Minimum Scale ===
Small reaction setups often become inefficient because:

* Fuel cost per reactor is too high
* Output volume is too low

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=== 3. Encourages Continuous Operation ===
Idle structures still burn fuel, so:<blockquote>You are incentivised to keep reactors running at all times</blockquote>
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= Maintenance Costs Beyond Fuel =
Fuel is not the only ongoing cost in reaction operations.
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== 1. Structure Repair and Damage ==
Structures may require:

* Armor repair after attacks
* Shield reinforcement recovery
* Replacement modules if destroyed

These are not constant but can be extremely expensive.
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== 2. Module Wear and Reconfiguration Costs ==
While modules do not “wear out,” industrial changes often involve:

* Removing and reinstalling rigs
* Reconfiguring reaction setups
* Downtime during changes

Each change has opportunity cost.
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== 3. Defensive Costs (Player-Owned Structures) ==
If your reaction farm is in space:

* You may need defensive fleets
* Intel coverage
* Standing fleets or timers

These are indirect but real ISK costs.
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= Fuel Efficiency and Structure Choice =
Different structures impact fuel usage differently.
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== Refineries (Primary Reaction Structures) ==

* Designed for reactions and moon mining
* Most fuel-efficient option for reaction work
* Bonus efficiency reduces per-unit cost

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== Citadels (Less optimal for reactions) ==

* Can run industry services
* Typically less efficient for reaction workloads
* Higher opportunity cost per job

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== NPC Stations (Rare for reactions) ==

* No fuel cost
* But often higher taxes and no bonuses
* Limited reaction capability compared to structures

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= How Fuel Costs Scale =
Fuel costs scale with:
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== 1. Number of Structures ==
More reactors = more fuel consumption.
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== 2. Activity Level ==
Continuous operation = constant fuel drain.
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== 3. Structure Size ==
Larger structures generally consume more fuel.
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== 4. Installed Services ==
More active services = higher fuel usage.
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= Example: Reaction Farm Fuel Impact =
Imagine a medium reaction farm:

* 5 refineries
* 24/7 operation
* Multiple reaction modules active

Even with efficient setups:

* Fuel becomes a '''major recurring cost'''
* Often one of the top 2 operating expenses
* Can reduce margins by a significant percentage

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= Hidden Cost: Fuel Opportunity Cost =
Fuel itself has market value.

This means:<blockquote>Every fuel block used is ISK you could have spent elsewhere.</blockquote>So fuel cost is not just:

* “expense to run structure”

It is also:

* “capital removed from other industrial opportunities”

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= How to Reduce Fuel Costs =
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== 1. Consolidate Structures ==
Fewer structures = lower total fuel usage.
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== 2. Maximise Reactor Uptime ==
Idle structures still consume fuel without generating ISK.
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== 3. Use Efficient Structures ==
Refineries are usually the best option for reactions.
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== 4. Run Higher Volume Operations ==
Spread fuel cost over more output.
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== 5. Optimise Location ==
Cheaper logistics reduces indirect fuel-related costs.
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= Common Beginner Mistakes =
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== 1. Ignoring fuel entirely in calculations ==
This leads to false profitability.
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== 2. Running too many small structures ==
High fuel overhead per unit output.
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== 3. Leaving structures idle ==
Fuel burns without production.
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== 4. Overbuilding reaction farms early ==
Scaling fuel costs before income supports it.
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== 5. Not tracking fuel price changes ==
Fuel market fluctuations directly affect profit margins.
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= Maintenance Planning for Reaction Farms =
A stable reaction operation requires:
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== 1. Fuel Stockpiles ==
Always maintain buffer stock to prevent downtime.
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== 2. Regular Supply Runs ==
Ensure continuous fuel delivery cycles.
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== 3. Structure Monitoring ==
Track fuel levels and consumption rates.
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== 4. Market Awareness ==
Fuel price spikes can significantly impact profitability.
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= The Role of Fuel in Industrial Strategy =
Fuel acts as a '''soft limiter on industrial scaling'''.

It influences:

* How many reactors you can run profitably
* Whether small-scale operations are viable
* How efficiently large alliances operate industry

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= Final Summary =
Fuel costs and maintenance are a critical but often underestimated part of reaction industry in EVE Online. Every refinery consumes fuel blocks continuously while active, and this cost scales with the number of structures, services used, and operational intensity.

Beyond fuel, maintenance includes repairs, reconfiguration, and logistical support, all of which contribute to the true cost of running a reaction operation. When properly accounted for, fuel costs significantly impact reaction profitability and often determine whether small-scale setups are viable or whether scaling is required for efficiency.

In EVE Online industry, fuel is not just a maintenance requirement—it is a constant economic pressure that shapes how reaction farms are built, scaled, and operated.