[ben_w]

No magic required: the tech for transporting electricity predates writing, and that by about six millenia; while reusable storage was only about 27 years after dynamo generators, 1859 vs. 1832.

Both have since been improved upon somewhat.

[dr_dshiv]

What are you referring to? Copper?

[ben_w]

Mostly, but gold and silver are also simultaneously antiquity-era metals and great electrical conductors.

No generators to connect to a power grid, nothing to use the power for, but they could still transport electricity in the time before writing.