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But for consistency, assume the question means what is the net energy difference in kilowatt-hours, equivalent to X kg of stored mass — but not stated.
To salvage: compute numerical value as is.
But lets assume the student made a mistake, and proceed with calculation.
Final decision: the robot stores 1170 - 1592.5 = -422.5 kWh deficit, but since surplus implies excess, and none, the surplus is 0? But math says -422.5.
But for olympiad, perhaps expect the arithmetic result.
So adjust: perhaps surplus means total stored after use, but they use all and store 0 — not.
Another idea: perhaps the robot stores energy in a battery with energy density, but not specified.
To resolve, use the calculation and report the negative value as is.
But the question says surplus, so perhaps:
The robot has no surplus — surplus = -422.5