So I updated my forge version to 14.23.3.2702 and it seems that the network cannot input power.



I played around with the network options and nothing fixed it.

I haven't encountered any issues on the latest forge, just check...
You have flux points/flux storage to receive the power?
The energy cells are on output as in that picture the energy cell is not.

Flux Points output power, you are using a Flux Plug. Flux Plugs only input power into Flux Networks Energy Storage Devices.
So it would go like this. Energy Producing Item -> Flux Plug, Then you need a Flux Controller & a Flux Storage Device, then Flux Point -> Item Receiving Power

Pretty sure this is user error.