Viewing the wiring rules image above:
Proportional maximum wire connection distances left to right, pole connection rules, top to bottom.
The use of higher quality electric poles will disturb some of the symmetry.

Electric Grid

An overhaul of the electric network, engineer an Electric Grid.

See license.txt for credits to the developers and their work that came before.
A special thanks to Stringweasel for his work on Fluidic Power, the inspiration.

The FAQ contains helpful tips and "too much information".

Important notes:
The electric network overhaul should only be added to a new or early game, it significantly modifies the electric poles.
If quick on/off via the circuit or logistic networks is not a priority, set "On tick interval" setting to 0 for near zero UPS impact.
Comments and suggestions are welcome.

Adds:
Transformator
Small iron electric pole
Huge electric pole
Underground substation
Circuit pole

Removes:
Power switch

Changes:
Small poles are the new medium poles
Medium, big, huge and circuit poles have no supply area and optional lights

Wiring rules:
Small poles can connect to small and medium poles
Medium poles can connect to small and medium poles
Big poles can connect to big poles, substations, underground substations, and circuit poles
Huge poles can only connect to huge poles
Substations and underground substations can only connect to big poles
Circuit poles can connect to circuit poles and big electric poles
Transformators can only connect to medium, big and huge poles

Small poles and substations are for power distribution and collection
Medium, big and huge poles are for power transmission only
Substations and underground substations are fast-replaceable
Circuit poles create copper wire connections for performance considerations, but are hidden

Startup setting to set the huge electric pole's maximum wire distance.
Startup setting to disable the electric network overhaul, effectively transformator only.

Transformators can be controlled via the circuit and/or logistic networks.

Set the Fluid filter to special fluids to manually enable and disable.
Selectable power rating (1MW to 10GW)

No quality bonus is applied to transformators, placing a higher quality will result in normal quality.

Transformators do function as expected if connected in parallel.
Very similar to Electric Transformators but a little different.
Do not place the transformator in the supply area of an electric pole.

Fulgora
Disrupted by the heavy planetary magnetic field and extreme electrical storms, transformators can not be placed.
Wiring rules are relaxed, permitting copper wire connections between any of the transmission only poles.

Limitations:
Transformator circuit conditions and copper wiring are not included in blueprints.

Helpful Mods:
Wire Tools - Isolates selected poles into a separate electric network
Electric Grid Enforcer - Enforce 90 degree wire angles, as poles are placed
Rewire Tool v2 - Enforce 90 degree wire angles, after placement

Supported Mods:
AAI Industry - Support for the small iron electric pole
Cargo Ships - Support for the oil-rig pole and floating electric pole
James' Electric Trains Plus - Support for electric rails (connect to medium poles)
Factorio+ - Support for electric poles and electrical distributor
Power Overload - Support for the mechanics and poles