Steve,
I'm sorry, but you mix up energy and power (like many people do).
Reality is far less than what you suppose.
1000 kg dropping 33m gives an energy amount of 1000 * 9.8 * 33 = 323,400 Nm = 323,400 J.
Not Nm/second. That would be the power (in Watts) if you dropped the 1000 kg in one second. So 323.4 kW (but just for one second.....)
for comparison: 1 kWh=1000Wh=3600*1000 Ws or J = 3,600,000J
So if you lift/drop 1000 kg over 33m the amount of stored energy is 323,400/3,600,000=0.09 kWh or almost nothing!
Many people think that lifting mass can store huge amounts of energy.
That's only true if you lift huge masses over huge distances (like in waterpower systems).
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