Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 482 7.1 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484 7.1 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495 7.3 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418 6.1 20 to 24 years . . . . . . . . . . . . . . . . . . . . ....

Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.2 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.5 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.3 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 9.3 20 to 24 years . . . . . . . . . . . . . . . . . . . . . . ....

Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.7 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 9.0 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7.1 20 to 24 years . . . . . . . . . . . . . . . . . . . . . . ....

Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,899 10.2 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,652 9.3 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,317 8.1 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,492 8.8 20 to 24 years . . . . . . . . . . . . . . . . ...

The electric system needs to balance supply and demand on a moment to moment basis. Energy commodities such as coal, oil and natural gas can be readily stored in massive quantities. However, the storage of electricity has been relatively complex and expensive. Today, with the changing ways in which electricity is generated and used, increased penetration of renewable energy sources and smart gr...