Overhead lines are probably the simplest and cheapest option, but the downside is that you're basically limited to trucks only due to the cable height, unless y

Overhead lines are probably the simplest and cheapest option, but the downside is that you're basically limited to trucks only due to the cable height, unless you also have a passenger car-only lane with lower cables. There's a test in Sweden that uses power rails embedded under the road surface. I like that approach because it's more versatile and looks better, but on the other hand it's also more expensive.