ENBRIDGE INC

The company was initially incorporated by Imperial Oil as Interprovincial Pipe Line Company (IPL) on April 30, 1949, after Canada's first major oil discovery, in 1947, at Leduc, Alberta. In the same year, the company built its first oil pipeline from Leduc to Regina, Saskatchewan. In 1950, it was expanded through Gretna, Manitoba, to Superior, Wisconsin, in the United States. To operate the United States portion of the pipeline, the Lakehead Pipe Line Company (now Enbridge Energy Partners) was created. In 1953, the pipeline was expanded to Sarnia, Ontario, and in 1956 to Toronto and Buffalo, New York.

In 1953, IPL was listed on the Toronto and Montreal stock exchanges. In 1983, IPL built the Norman Wells pipeline and joined Frontier Pipeline Company. In 1986, through a series of stakes exchanges, IPL gained control of Home Oil and in 1988, it changed its name to Interhome Energy Inc. In 1991, it changed its name to Interprovincial Pipe Line Inc.

In 1992, Interprovincial Pipe Line Inc. was acquired by Interprovincial Pipe Line System Inc., which changed its name to IPL Energy Inc. in 1994, after the acquisition of Consumers' Gas (now Enbridge Gas Inc.) and diversification into the gas distribution business. In addition, it acquired stakes in AltaGas Services and the electric utility of Cornwall, Ontario. Through the 1990s, the company expanded its gas pipeline network and acquired a stake in the Chicap oil pipeline. It also built the Athabasca Pipeline from northeastern Alberta to the main pipeline system. In 1995, the company expanded its activities outside of North America by taking a stake in the Ocensa pipeline. This stake was sold in 2009. IPL Energy became Enbridge Inc in 1998. The Enbridge name is a portmanteau from "energy" and "bridge".

In the 2000s, Enbridge introduced several large projects. Enbridge made their first investment into renewable energy in 2002 with the purchase of a wind farm. In 2006, it announced the Enbridge Northern Gateway Pipelines Project from Athabasca to Kitimat, British Columbia. The same year, it announced the Alberta Clipper pipeline project from Hardisty, Alberta, to Superior, Wisconsin, to connect oil sands production area with the existing network. This pipeline became operational in 2010.

In 2009, Enbridge bought the Sarnia Photovoltaic Power Plant and expanded it up to 80 MW, which was the world's largest photovoltaic power station at that time.

In January 2017, Enbridge acquired Midcoast Energy Partners for $170 million in cash, and later in 2018, ArcLight acquired Midcoast Operating, L.P. from Enbridge for $1.1 billion.

Enbridge released its first annual sustainability report in 2001, and in November 2020, Enbridge expanded its environmental, social and governance (ESG) goals and targets. The company aims to achieve net-zero greenhouse gas emissions by 2050, with an interim target to reduce emissions intensity by 35% by 2030. That same year, President and CEO Al Monaco said that renewable power is now "the fourth Enbridge platform." Enbridge's ESG goals also aim to diversify its workforce with 28% representation from racial and ethnic groups and 40% from women by 2025.

In 2021, Enbridge was recognized as one of Canada's top 100 employers for the 18th time, and as one of Canada's best diversity employers for the seventh time.

In September 2023, it was announced Enbridge had agreed to acquire East Ohio Gas, Questar Gas, and Public Service Co. of North Carolina, from Dominion Energy for a total enterprise value worth $14 billion. The acquisition will result in Enbridge being the largest natural gas utility franchise in North America.

In September 2026, Enbridge announces the acquisition of Tallgrass Energy following a $2.55 billion agreement.

Merger with Spectra Energy

On September 6, 2016, Enbridge agreed to buy Spectra Energy in an all-stock deal valued at about $28 billion. Spectra, headquartered in Houston, Texas, operated in three key areas of the natural gas industry: transmission and storage, distribution, and gathering and processing. Spectra was formed in late 2006 as a spin-off from Duke Energy. Spectra owned the Texas Eastern Pipeline (TETCo), a major natural gas pipeline transporting gas from the Gulf of Mexico coast in Texas to the New York City area; TETCo was one of the largest pipeline systems in the United States. Spectra also operated three oil pipelines, numerous other gas pipelines and was proposing to build still 3 more gas pipelines in the U.S. The merger was completed on February 27, 2017.