The route a power line takes through a neighborhood
As seen on your question about angles generally the connection from the power line to the house goes via either a Distribution Transformer (the grey cylinders in your image) where the power lines are run at a much higher voltage than domestic use and then either down the pole, into the ground for local delivery to the house or directly to the house.

In terms of how many lines and paths - I'd start from your primary sub-station where the main power lines come in and radiate out from there - initially with four lines, and then stepping down to two about half-way to two thirds out - effectively the lines are running in parallel, with each house drawing off their usage as it goes, so you'll see some drop off.

Depending on the final scale, more than four lines might look cluttered, whereas two will convey the impression of power nicely even if it's not physically accurate (a nice compromise might be three, with the third line running on top of the poles).