U.S. producer Century Aluminum warned last week it would begin shuttering its Hawesville smelter in Kentucky in October "unless the current pricing environment substantially improves".

Barring some sort of miraculous divine intervention, the number of operating smelters in the United States looks set to fall to just seven from 13 prior to the Global Financial Crisis (GFC) of 2008-2009.

And more cuts will have to come, given a consensus view, even among producers, that the aluminum market is both in current over-supply and burdened by the dead weight of legacy stocks from past over-supply.

But will Century's actions make any difference?

After all, we've been here before.

Overshadowed by its announcement on Hawesville was Century's decision in July to dismantle permanently its Ravenswood smelter in West Virginia. Ravenswood has lain idle since 2009, a reminder that producer pain is nothing new in this sector and a warning that successive waves of cutbacks have failed to correct aluminum's structural problem of excess capacity.

The uncomfortable truth for Century and its peers is that until something changes in China, there won't be much change to the "current pricing environment".

LOCAL RIPPLE

Hawesville, which started production in 1969, has a capacity of around 255,000 tonnes per year, although it has been operating at around 80 percent of that rate since a labor dispute in May, subsequently resolved.

Four of its five potlines produce "high purity" metal grading 99.9 percent rather than the industry-standard 99.7 percent, according to Century's website, although any corresponding "competitive advantage" has evidently been eroded by the collapse in aluminum prices.

Hawesville's closure is likely to have a ripple effect on U.S. supply-demand dynamics.

It will increase further the country's already significant reliance on imports and more of these will have to come from further afield since traditional U.S. suppliers, such as Brazil and Venezuela, are also much diminished producing nations.

In theory, that should be supportive for local physical premiums. As the distorting effect of long load-out queues from London Metal Exchange warehouses in Detroit fades, the premium boom has turned to bust.

On the CME the September premium contract, indexed to Platts' assessment of the U.S. Midwest market, is currently trading at 7.1 cents per lb, or around $157 per tonne.

The loss of yet another U.S. smelter should, at the very least, put something of a firmer floor under that premium.

What Hawesville's closure won't do, however, is change the global supply-demand dynamics. It is simply too small a plant to do so.

More will be needed.

Maybe from fellow U.S. producer Alcoa, which still has around 400,000 tonnes of annual capacity under active review.

Maybe from Russian giant Rusal, which has guided, albeit vaguely, to around 200,000 tonnes of higher-cost capacity cutbacks.

THE NEW GLOBAL MARKET

But even if these two aluminum giants delivered on 600,000 tonnes of extra capacity cuts, would it make any difference?

Once, it would have done.

That was when the aluminum world was a different place, neatly divided into two "parallel universes", in the words of Klaus Kleinfeld, chairman and chief executive at Alcoa.

There was China. And there was the rest of the world. The two were separated by China's prohibitive 15 percent export tax on primary aluminum.

Back then what giants like Alcoa and Rusal did really counted in the world outside of China.

Now, however, those parallel universes have collided in the form of fabricated aluminum products flowing out of China in ever greater quantities. There were 340,000 tonnes of such exports in July alone, more than Hawesville's annual capacity.

Adding perceived insult to injury for producers such as Century is the persistent speculation that some of those products are not really products at all, just metal that has been sufficiently transformed to duck the export duty and qualify for a VAT rebate.

Or, to quote Michael Bless, chief executive and president of Century: "The simple fact is that the recent significant decline in the aluminum price is being driven by unfair trade behavior over which our industry has no control."

"Chinese overcapacity and the improper export of heavily-subsidized Chinese aluminum products have undercut an otherwise viable plant."

The problem is that no-one is claiming that anything other than a small part of those Chinese exports are "fake semis", as they have been nicknamed in the market.

The rest are "real semis". And they have reduced to rubble China's previous great aluminum wall.

The new aluminum market is a genuinely global one and one that is now dominated by China.

That's why the world is still awash with aluminum.

Non-Chinese producers have taken some 2.5 million tonnes of capacity out of operation since the GFC.

China, with a brief interruption at the height of the crisis, has simply carried on adding capacity and kept on producing more aluminum.

The country now accounts for 55 percent of global primary metal output, almost double its share of output at the end of 2008.

A DROP IN THE OCEAN

If aluminum's prospects are going to improve any time soon, it's going to be China that tips the balance.

But will it?

Recent history is not encouraging. The country is producing too much metal to feed even its voracious appetite. That is why so much is leaking out in the form of semi-fabricated products.

China has some of the newest, lowest-cost smelters in the world. It also has some of the least efficient, highest-cost smelters in the world.

The latter are kept afloat by local governments desperate not to lose industrial capacity for all the obvious social and tax reasons.

For exactly the same reasons Beijing is unlikely to clamp down on the flow of semi products out of the country, even if some of these are of dubious legality.

A government already struggling to balance economic growth with a desire to shift that growth towards a more consumerist model, is not going to countenance mass industrial closures.

As with China's steel sector, also characterized by excess capacity and poor operating margins, exports act as a vital cash flow lifeline and one that trumps the potential threat of trade complaints.

If anything's going to change, it will be down to the same brutal pricing environment facing non-Chinese producers. Many Chinese producers are also losing money and not all of them benefit from local government largesse.

There are reports, fed by a statement from the China Nonferrous Metals Industry Association (CNMIA), that some of the country's most established operators are contemplating up to 2.4 million tonnes of capacity cuts over the next few months.

Such statements have come and gone in previous times of low prices. It remains to be seen just how much substance there is in the latest guidance.

But if it does one thing, that CNMIA statement highlights the new aluminum market, one in which China can talk about suspending millions of tonnes of capacity and one in which Hawesville's closure will be but a drop in the global ocean.