The electricity cost is what you are paining in euro's or dollars to whatever company you get your electricity from.
The network fee is the fee you pay when you send a transaction to someone.
You only pay the first thing with mining.
I don't agree. There are a lot of little extra charges and taxes on my bill. Plus even if those charges don't fluctuate with how much you use, they still have to be paid.
Here is what I do. These are actual numbers from my last bill.
106.57 US dollars for the month
divided by 913 kWh
equals 0.116725 US dollars per kWh