The amount of waste energy is much higher, most lost as waste heat.
Different power is lost at different stages
1-2% of energy is lost during the step-up transformer from when the electricity is generated to when it is transmitted.
2-4% of energy is lost in the transmission lines
1-2% of energy is lost during the step-down of the transform from the transmission line to distribution.
4-6% of energy is lost during the distribution
So, the average loss of power between the power plant and consumers ranges between 8-15%.
Electrical (Coulometric) Efficiency
The ratio of the energy required to charge a battery compared to the available energy during discharge is referred to as the efficiency. A typical lithium ion battery will lose only 5% of energy round-trip (95% efficiency), compared to 20-25% losses for lead-acid systems.
Both lead-acid and lithium-ion technologies perform well with regards to self-discharge, with losses of around 5% of capacity per month. In frequent cycling applications this loss is of little consequence.
Add to that the inefficiencies of generation when one energy source has to be turned into another:
Coal/Natural Gas (NG)/Liquid Petroleum Gas (LPG) electrical generation