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.
actually "cannot be stored" is completely correct. when something is not done then it is not possible. for example you can not store electricity for usage of a small village in a "battery". so no it is not possible to store electricity.
also you should read that statement in its context not out of it. we are talking about large scale storage of Electricity that a electric company produces not a tiny scale electricity that you need to run your cell phone!