user: Question: What is the number of generators where the power capicity is 78.7?
Columns: ['Power Source', 'Number of Generators', 'Power Capacity (GW)', '% of total Capacity', 'Capacity factor', 'Annual Energy (billion kWh)', '% of annual production']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Hydro', 4048.0, '78.7', '7.5', '0.463', '319.4', '7.7']
SQL:

assistant: SELECT "Number of Generators" FROM "Table" WHERE "Power Capacity (GW)" = '78.7';