COLUMN-Can Trump resurrect U.S. aluminium, and who killed it anyway? Andy Home

(Repeats Thursday column. The opinions expressed here are those of the author, a columnist for Reuters)

By Andy Home

LONDON, July 13 (Reuters) - Alcoa is bringing one of its U.S. aluminium smelters back from the dead.

The Warrick smelter in Indiana has annual capacity of 269,000 tonnes, its own coal-based power source and is integrated with a rolling mill.

None of which saved it from Alcoa's scramble down the cost curve in the face of falling prices, culminating in its permanent closure in January 2016.

That's different from what the industry calls a "curtailment", a temporary idling for possible restart.

But now, miraculously, Warrick is back and Alcoa will fire up three of the plant's five production lines, with capacity of 161,400 tonnes of aluminium. The other two will be classified as "curtailed".

The timing of this resurrection is politically charged.

The Trump administration is determined to curb imports of aluminium, along with steel, with the aid of some heavy national security artillery. The results of both so-called Section 232 investigations are pending.

And Alcoa, for one, "appreciates the actions the Trump administration has taken to address the challenges faced by the U.S. aluminum industry, including Chinese overcapacity".

The United States had 23 operating plants in 1998. It now has five, soon to be become six. There is a little more than a million tonnes of capacity lying idled, ready for restart if the conditions are right.

However, most of the lost smelters are long past the point of resurrection, with plants dismantled and sites reclaimed.

China, with its massive aluminium sector and equally massive exports, stands accused, but the real smelter killers were much closer to home.

PRICE AND POWER

Alcoa's change of mind is in part down to the aluminium price, which has risen from below $1,500 a tonne in January 2016 to more than $1,900 today. It has done so, ironically, on the promise of Chinese capacity cuts.

But there is also a power supply dimension, Alcoa noting an agreement with local utility Vectren to operate one of the four on-site power generation units through 2023.

This, Alcoa says, "provides important clarity for the power portfolio at Warrick", albeit without providing a lot of clarity for the rest of us.

The key point, however, is that there is always a power dimension in the mix when aluminium smelters close or restart. They use a lot of it and profitability is determined primarily by the interaction of power and aluminium prices.

WEST COAST KILLER

It was the breakdown in that relationship in 2000-01 that dealt the killer blow for the 10 smelters feeding off the power generated by hydroelectric dams in the Pacific Northwest of the United States.