
Accumulators are an essential component of the electric power system in Factorio, acting as energy storage units and offering backup power in times of heavy demand or when other power sources are insufficient. They can be used to deliver energy in another electrical network and can charge and discharge simultaneously. To connect an accumulator to the electric network, it must be placed within the power zone of an electric pole or substation. This guarantees a connection to the network and enables the accumulator to contribute to the power supply. The accumulator will then charge from excess power production and discharge when power production is insufficient to meet demand.
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What You'll Learn
- Place accumulators in the power zone of any electric pole/substation
- Use accumulators to deliver energy to another electrical network
- Monitor and control charge levels with a circuit network
- Use accumulators to limit electricity consumption in low power situations
- Connect accumulators to a power switch to switch between power sources

Place accumulators in the power zone of any electric pole/substation
To connect an accumulator to your main power line, place the accumulators in the power zone of any electric pole or substation. They will charge from excess power production and discharge if power production is insufficient to meet demand. For example, if there is a sudden mass laser discharge, the accumulators will discharge to meet the demand.
Accumulators can be used to deliver energy in another electrical network, and they can charge and discharge at the same time. They have a lower delivery priority than any other entity, so they only receive energy when there is enough left over after powering all other entities in a network.
To check if an accumulator is fully charged, hover your mouse over it. When fully charged, it will not do anything to your power grid until your generators or panels cannot supply your machines. You can also check if an accumulator is connected by looking for a warning symbol. If it is not flashing, then it is connected.
To connect an accumulator to a power grid, you need to have a wire from an electric pole to the accumulator.
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Use accumulators to deliver energy to another electrical network
Electric accumulators are designed to store and release energy based on the user's requirements. They are used to deliver energy to another electrical network. They can be used as a reserve energy capacity in electrical networks, storing electricity when production exceeds demand and feeding it into the grid when production is insufficient.
In the context of Factorio, accumulators can be used to isolate two separate power networks. They have a lower delivery priority than other entities, meaning they only receive energy when there is enough left over after powering all other entities in a network. To set up this system, you need to ensure that the electric poles for each network connected to the accumulators are not connected to each other. This can be done by crafting a copper wire and then dragging it between two connected poles to sever the connection.
Accumulators can also be used in conjunction with solar panels. During the day, solar panels can produce energy that is used to power factories, and any excess energy is used to charge accumulators. At night, the accumulators then discharge this stored energy to power the factories.
In addition to their use in games like Factorio, accumulators also have practical applications in the real world. They can be used as a source of energy supply independent of the electricity network, which is useful for remote areas or companies that want to reduce their dependence on the grid. They can also be used in combination with renewable energy systems, such as solar panels, to optimize the use of clean energy and reduce dependence on fossil fuels.
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Monitor and control charge levels with a circuit network
Accumulators can be used to monitor and control charge levels with a circuit network. They store excess energy when production exceeds demand and discharge when demand is not being met. This is useful when there is a surplus of energy produced by solar panels during the day, which can be used to charge the accumulators. At night, the accumulators can discharge to power your factory.
To monitor the charge level, the accumulator will output its level of charge as a percentage on a signal. This allows you to set conditions for the circuit network to control devices. For example, you can set a power switch to turn on when the accumulator charge drops to a certain level, such as 20%, and turn off when the accumulator is charged to 90%. This is known as an SR latch, which "remembers" the on state until the accumulator reaches a certain charge level again.
Additionally, you can use a power switch to separate the steam power grid and the solar power grid. By connecting the accumulators to the solar side, you can automate when the steam power kicks in based on the accumulator charge level. For instance, you can set the steam power to activate when the accumulator charge reaches 10%.
The circuit network is built using red or green wire, and devices that can be connected will have an icon in the top right corner of their info pane. By clicking this icon, you can connect the device to the circuit network and set conditions for its operation based on the accumulator charge level.
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Use accumulators to limit electricity consumption in low power situations
Accumulators are energy storage devices that support power management during high demand or failing power source situations. They can be used to limit electricity consumption in low-power situations by strategically isolating non-critical parts of your factory from critical components.
To connect an accumulator to your main power line, place it within the power zone of any electric pole or substation. Accumulators will charge from excess power production and discharge when power production is insufficient to meet demand. They have a lower delivery priority, ensuring they only receive energy when there is enough left after powering other entities in the network.
In the context of limiting electricity consumption, you can place your main generators and critical components on one network and the non-critical components on another, isolated network. This way, power will only flow to the non-critical network when there is a surplus on the main network, effectively limiting power consumption when electricity is in short supply.
Additionally, accumulators can be used in combination with renewable energy systems, especially solar energy. During the day, solar panels can charge accumulators, and at night, the stored energy can be discharged to power your factory. This combination helps to reduce grid consumption and lower electricity costs.
It is important to note that accumulators have a maximum charge and discharge rate, typically around 300 kW, and each accumulator can store up to 5 MJ of energy. Understanding these limitations is crucial for effective power management and planning.
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Connect accumulators to a power switch to switch between power sources
Accumulators are devices that store excess energy when production exceeds demand and release it when demand exceeds production. They can be used to deliver energy to another electrical network and can charge and discharge simultaneously.
To connect accumulators to a power switch to switch between power sources, follow these steps:
- Place the accumulators in the power zone of any electric pole or substation. They will charge from excess power production and discharge when power production is insufficient.
- Ensure that the accumulators are connected to the power source that will be used as a backup, such as solar power.
- Install a power switch between the primary and secondary power sources. The power switch will allow you to connect or disconnect the power sources.
- Wire the accumulators to the power switch. This will enable you to isolate the primary power source when the accumulators are charged and toggle it back on when the charge falls below a certain threshold.
- Set up the circuit logic to automate the switching between power sources. This can be done by creating an SR latch (memory toggle) using combinators or by using an ATS (Automatic Transfer Switch) to switch to the alternative power source when the primary source drops.
By following these steps, you can effectively connect accumulators to a power switch, allowing for seamless switching between power sources when needed.
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Frequently asked questions
Place the accumulator in the power zone of any electric pole/substation. It will charge from excess power production and discharge if power production is insufficient to meet demand.
If the accumulator is not flashing with a warning symbol, it is connected. You can also check the charge level of the accumulator by hovering your mouse over it.
Install a power shutoff towards the steam engines when the accumulator signal is above 10%. Alternatively, place a switch separating the steam power grid and the solar power grid, and ensure the accumulators are connected to the solar side.

































