Enbridge is a leading North American energy infrastructure company.Enbridge (ENB +0.51%) is one of the largest energy infrastructure companies in North America. It transports about 30% of the crude oil produced on the continent, ships almost 20% of the natural gas consumed in the U.S., and operates North America's largest gas utility franchise. Additionally, it's an early leader in investing in renewable energy. However, there are a few crucial factors investors need to know about the energy stock before bu ...