 It is home to the Beauharnois Hydroelectric Power Station, as well as the Beauharnois Lock of the Saint Lawrence Seaway.The Battle of Beauharnois was fought at Beauharnois in 1838, between Lower Canada loyalists and Patriote rebels.As part of the 2000–2006 municipal reorganization in Quebec, the neighbouring towns of Maple Grove and Melocheville were amalgamated into Beauharnois on January 1, 2002.