user: Question: What is the date (to) associated wiht a traction type of Electric and the Yarmouth Light and Power Company system?
Columns: ['Name of System', 'Location', 'Traction Type', 'Date (From)', 'Date (To)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Nova Scotia Light and Power Company, Ltd', 'Halifax', 'Horse', '11 Jun 1866 21 Oct 1886', '17 May 1876 31 May 1896']
SQL:

assistant: SELECT "Date (To)" FROM "Table" WHERE "Traction Type" = 'Electric' AND "Name of System" = 'Yarmouth Light and Power Company';