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So no additional kWh must be imported — in fact, surplus. But the question likely intends: what is the total energy deficit during storm? None.
But perhaps the additional is misleading. Or perhaps it’s asking: how much extra energy would have been needed beyond current plans — none.
Given confusion, perhaps the intended meaning is: how much energy is required during the storm, and since no generation, but they rely on stored energy — but stored is zero? Not stated.
Alternative: maybe additional is not literal — but the structure: how much X must be imported when no solar. But without initial storage, import = 230.4 kWh needed. But the question says additional — possibly error.
But in context, the most logical interpretation: the colony must have stored energy equal to 9× requirements, but since generation is available, but the surplus is generated, not imported.
Wait — the 350 kWh/day is generated *per sol*, so over 9 sols: 3150 kWh total. Demand: 8×3.2×9 = 230.4 kWh. So they need 230.4 kWh in storage to cover during storm. But if no initial storage, they must import 230.4 kWh. But imported implies external supply — which they don’t have.
But in colony terms, imported might mean extracted from external sources — but Mars is the colony.
Best resolution: the question intends to ask: how much energy must be stored to survive 9 days of dust storm? But since generation continues, no storage loss — but need 230.4. But none is imported.
Perhaps the 3.2 kWh is baseline, but during storm, demand remains, and if no generation, energy deficit is 230.4 kWh — but it’s not imported; it’s deficit.
But imported suggests bringing in — so unless they have reserves, but the system generates, so reserves charge.