electricity

An aerial view at night of the downtown Chicago skyline. An Arctic air mass is expected to chill much of the Central Plains and the East Coast through Monday with wind-chill temperatures dropping into the single digits overnight in some places.

Kiichiro Sato/AP

A nightime aerial view of downtown in the US city of Chicago

Employees check on an electricity pylon in Chuzhou, Anhui province, May 1, 2013.

China Daily/Reuters

Employees check on an electricity pylon in Chuzhou, Anhui Province in China.