user: Question: What is every residential monthly usage if large power demand is 6.86?
Columns: ['City (Utility)', 'Residential Monthly usage: 1000 kWh', 'Small power Power demand: 40 kW; Consumption 10,000 kWh, load factor: 35%.', 'Medium power Power demand: 1,000 kW; Consumption: 400,000 kWh, load factor: 56 %.', 'Large power Power demand: 50,000 kW; Consumption: 30,600,000 kWh, load factor: 85%.']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ["St. John's ( Newfoundland Power / NL Hydro )", '11.80', '11.83', '9.05', '3.98']
SQL:

assistant: SELECT "Residential Monthly usage: 1000 kWh" FROM "Table" WHERE "Large power Power demand: 50,000 kW; Consumption: 30,600,000 kWh, load factor: 85%." = '6.86';