Electricity powers light fixtures.
In 2010, lighting for the commercial / institutional sector in British Columbia, Yukon, the Northwest Territories and Nunavut
consumed 17,668,780 GJ and
emitted 190,895 GHG tonnes. 

Libraries, hospitals, stores and other public places all have abundant lighting.  On the one hand, this facilitates safe activity.  But, on the other hand, you as a user are not assigned any personal share of the GHG emissions associated with the services and goods you receive even though the lights are turned on for your benefit.
To learn how electricity flows from the power plant to a light switch in your office or local hospital, click on the yellow icons above....