JOHANNESBURG--South Africa's competition regulators will open Friday a hearing on the merger of Glencore International PLC (GLEN.LN) and Xstrata PLC (XTA.LN) that is one of the last hurdles for the deal to create the world's fourth-largest diversified mining company.

The deal needs only regulatory approval in South Africa and China to move ahead, after already receiving the backing of shareholders in both companies and the European Union last month.

Glencore and Xstrata will face stiff demands from South Africa's main electricity provider and unions at the hearing, which is due to start at 0700 GMT and run through Jan. 28.

South Africa's state-owned electricity provider, Eskom Holdings Ltd., previously said it will seek to protect its ability to obtain sufficient and competitively priced coal. The National Union of Metal Workers said it will seek limits on layoffs.

The possible job losses that could result from the merger has drawn strong interest at a time when South African authorities are in talks with the country's largest platinum producer, Anglo American Platinum Ltd. (AMS.JO), over a proposed restructuring that would cost 14,000 jobs.

"The Competition Commission assessed the merger and concluded that although the transaction was unlikely to cause a substantial lessening in competition, it raised public interest concerns because the merging parties intended to retrench a number of employees," the Competition Tribunal said in a statement this week about the Glencore-Xstrata deal.

South Africa's competition authorities have placed conditions to approval on previous mergers when jobs were at stake. When it approved Wal-Mart Stores Inc.'s acquisition of a majority stake in South African retailer Massmart Holdings Ltd. earlier this year, the combined entity had to refrain from job cuts for the first two years, honor union bargaining agreements for three years and fund small-business development.

South Africa's Competition Commission, which makes the initial decision on whether a merger will be allowed, recommended to the Competition Tribunal, where a final decision will be made, that the combined Glencore-Xstrata business be allowed limited layoffs for the first two years and that is should also fund a skills-development program.

Eskom produces about 90% of the country's electricity through coal-fired power plants. The utility says it doesn't want to block the merger, but is concerned about the repercussions for its coal supply. Already the utility has complained to the state that coal producers are exporting too much and charging too high a price.

In the past few years, Glencore has been adding to its coal production in South Africa, acquiring a majority ownership of the country's sixth-largest producer this year. South Africa is the world's seventh-largest coal producer. Glencore previously said that it saw demand from Eskom as a driver to its investment.

Write to Devon Maylie at devon.maylie@dowjones.com

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