I am solving some interviewing questions regarding gas storage optimization. I am given a gas storage facility with volume, rate of injection and withdrawal, as well as a current forward curve of gas price for the next 12 months. Obviously I should buy forward contracts for the months where prices are lowest, to max out my capacities, and sell forward contracts for the months where prices are highest. This is easy. Then the question becomes: the next day, the forward curve moved, but the basic ordering is unchanged (i.e., the cheap months are still cheap, etc..) , how do I adjust my positions of the forward contracts (long and short) in order to optimize my profit? Since I already maxed out all my capacities, any adjustments cannot change my gas flow. By no-arbitrage, I cannot generate profit by trading these contracts. Therefore I think there is no way to make changes to my contract positions to make more profit.
Am I missing something here? The question sounds like there is some adjustment to be made, otherwise it becomes a trivial question.