This thesis examines energy planning to reduce GHG emissions from cities. Examining federal government policy to reduce GHG emissions suggests that municipalities and provinces may be the better government levels for action. A review of types of municipal energy planning, and energy-GHG reduction plans from three cities shows different strategies and policies in implementation, and differing levels of success. Interviewing planners from these case-study cities provides critical insight into the challenges of implementing energy-GHG planning. The lessons learned show the best course of action for other jurisdictions, including the importance of an appropriate policy framework to support municipalities. Such a framework is suggested by this thesis. This research is meant to inform planners of best practices, challenges, opportunities, and courses of action for municipalities in formulating GHG reduction strategies.