(Bloomberg) — Europe’s gas sector is entering a crucial few months as the end of the heating season starts the clock ticking to fill storage facilities that are emerging from winter two-thirds empty.

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Normally, traders can be expected to play a key role in refilling inventories because fuel is typically cheaper in summer, allowing them to turn a profit by storing large volumes, ready to sell when demand rises again next heating season.

But this year is far from normal. The first really cold winter since Europe lost most of its piped supplies from Russia has depleted reserves faster than usual, and was further exacerbated when remaining flows through Ukraine came to a halt in January. The tightened market has driven summer gas prices persistently higher than those for next winter, which – crucially – removes the financial incentive for storage trades.

One key question is what role governments will play to ensure the facilities are refilled — and at what cost. Of course, there’s still plenty of time before next winter arrives. But traders say the first few weeks of April will provide an indication of whether the various market participants are ready to start reinjecting gas despite the potentially unprofitable price structure, or if they intend to play a waiting game.

“Some solution needs to be found in the short term to get storage injections started even though the prices are inverted today,” said Russell Hardy, chief executive officer of energy trading giant Vitol Group. There’s a debate in the market over “who is going to perform this task,” he added.

The stakes are high: Going into winter without storage nearly full would leave the region exposed to intense prices spikes if it’s hit with extra cold weather or other unexpected factors.

European Commission rules stipulate that storage sites need to be 90% full by Nov. 1. However, recent proposals and discussions about flexibility on the timing of the targets have created huge uncertainty about how the rules will be implemented, sending prices swinging and keeping traders guessing.

Benchmark futures have retreated in recent weeks amid speculation that the refilling targets may be loosened, as well as optimism for a ceasefire in Ukraine. In fact, if the war were to end soon and lead to a return of some flows from Russia, prices would likely drop, but such a prospect seems distant.