Redstone Conductance Coils are crafting materials added by Thermal Expansion. This combination of Electrum and Redstone is commonly used when storing large amounts of Redstone Flux. Because Electrum consists of both Gold and Silver, the resulting Coils can be used to both receive and provide Redstone Flux.
Devices that can store a significant amount of Redstone Flux or devices that can charge items usually require Redstone Conductance Coils to craft. A mnemonic for this is derived from the fact that these Coils are essentially combinations of Redstone Reception Coils and Redstone Transmission Coils: they are both
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