Plus electricity cannot be stored.
FYI:
Electricity can be stored,
1. Batteries
2. Flywheels
3. Gravitational potential energy using a pumped hydroelectric facility.
4. Compressed Air Energy Storage
5. Rail Energy Storage
6. Molten Salt Storage
7. Thermal Energy Storage
Reference: http://discovermagazine.com/2015/july-aug/26-power-stash
It should have been "electricity can not be stored in a profitable way".
None of these ways is what is considered "efficient".
It is more profitable to produce new energy instead of storing it.
Hmm , you can tell you got nothing to do with the energy business.
Have you ever heard of Peak Times, this is the time during the day when the most electricity is being used and utilities charge higher prices.
There are companies that do nothing but store energy during OFFPEAK Times when electricity is cheaper and resell it back to the Utilities during Peak Times.
Those companies profit from the difference in the price, which exceeds any loss from storing it.
Some companies that have solar farms setup have even started placing trailers onsite that contain massive batteries,
they charge these batteries and then have a Semi move them to another location that is paying a higher electricity rate than that location.
Even with the gas used, the % of power lost, and the truck driver wages, they make a profit off of transferring electricity by semi.
So the storage of Electricity and moving it where they can sell it for a higher price is a big deal and the smart players are starting to make a fortune off it.