Hydro One is Ontario's primary electricity transmission company, responsible for the high-voltage lines carrying power across the province and distributing electricity to rural and remote communities. The company was partially privatized beginning in 2015, with the province selling majority ownership to private shareholders while retaining a significant stake. Privatization remains controversial, with critics arguing it reduced public control over essential infrastructure and transferred profits to private investors. Hydro One's rates and operations are regulated by the Ontario Energy Board. The company's transmission infrastructure is essential for the entire provincial electrical system, affecting every municipality's electricity supply.