Because of [textlink="Power Ramping" link="Ramping"], it is important to have power storage devices to help flatten out spikes and dips in power usage, as well as to provide power in the event of a power deficit.
Each transformer for its respective power level ([color=orange]HV[/color], [color=yellow]MV[/color], and [color=green]LV[/color]) has an attached small battery to handle minor spikes and dips; however, this is not viable in the case of a large grid deficit.
## SMES
The Superconducting Magnetic Energy Storage (SMES) unit is a device that can store a large amount of power and release it quickly.
<Box>
<GuideEntityEmbedEntity="SMESBasic"/>
</Box>
In order to charge the SMES unit, [color=orange]HV[/color] power must be provided to a cable terminal pointing at the SMES unit. The SMES will draw power from the terminal and send power out from underneath.
The terminal will ensure that the [color=orange]HV input[/color] and [color=orange]HV output[/color] do not connect.
SMESes can store [color=orange][protodata="SMESBasic" comp="Battery" member="MaxCharge" format="N0"/] J[/color] of energy and can output a maximum [color=orange][protodata="SMESBasic" comp="PowerNetworkBattery" member="MaxSupply" format="N0"/] W[/color] of power.
If the battery is full, the SMES will pass through the power it receives from the input cable to the output cable. In the event of a power deficit, the SMES will ramp up to supplement the power draw.
## Advanced SMES
The Advanced SMES unit is a more advanced version of the SMES unit that can store even more power.
<Box>
<GuideEntityEmbedEntity="SMESAdvanced"/>
</Box>
They're primarily used in station SMES arrays to store large amounts of power for the station's power grid.
Advanced SMESes can store [color=orange][protodata="SMESAdvanced" comp="Battery" member="MaxCharge" format="N0"/] J[/color] of energy and can output a maximum [color=orange][protodata="SMESAdvanced" comp="PowerNetworkBattery" member="MaxSupply" format="N0"/] W[/color] of power.
