user: Question: For the 2013 completion schedule, what is the total S.no.?
Columns: ['S.no.', 'Power Plant', 'State', 'Total Capacity (MW)', 'Completion Schedule']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'Kishenganga', 'Jammu & Kashmir', 330.0, '2016']
SQL:

assistant: SELECT SUM("S.no.") FROM "Table" WHERE "Completion Schedule" = '2013';