The electricity sector in Canada has played a significant role in the economic and political life of the country since the late 19th century. The sector is organized along provincial and territorial lines. In a majority of provinces, large government-owned integrated public utilities play a leading role in the generation, transmission and distribution of electricity. Ontario and Alberta have created electricity markets in the last decade in order to increase investment and competition in this sector of the economy. In 2017, the electricity sector accounted for 10% of total national greenhouse gas emissions. Canada has substantial electricity trade with the neighbouring United States amounting to 72 TWh exports and 10 TWh imports in 2017.