By a brief and rough calculation (below), it would take about 10 000 m² of parachutes to produce 400 kW with 10 m/s wind speed. That’s a lot, it’s too much, it’s way too much. And the elevation angle of a parachute is not very high, being about 30-35 degrees (?) or about 45-50 degrees for my small (1 m diameter) bear parachute kite.
10 000 x 1.2 (air density) x 2/27 x 1000/2 (reel-in phase) = 444 kW.