By Devon Maylie and Alex MacDonald

CAPE TOWN--Big electricity increases will put more projects and jobs at risk in South Africa, mining executives said Thursday.

South Africa's state-owned electricity provider Eskom Holdings Ltd. applied for a 16% increase in electricity prices per year for the next five years to help fund its new building program and shore up its credit rating.

Eskom, which supplies about 95% of the country's electricity primarily through coal-fired power plants, asked the National Energy Regulator of South Africa in October for an average price increase of 13% to cover its own needs, plus an additional 3% to support new independent power producers.

Industry, such as mining, say this will render projects unaffordable and lead to more closures or job losses in an industry already struggling with weak demand, lower prices and labor wage increases that beat inflation.

Eskom already raised prices by around 24% a year over the past three years. Mining executives last week argued to the energy regulator that the price increase can't be that high.

If Eskom's proposal goes forward, "we will see projects being stopped and jobs being lost," said AngloGold Ashanti Ltd.' s (ANG.JO) outgoing Chief Executive Mark Cutifani.

The cost increases has already led to some projects to shut. Last year Xstrata PLC(XTA.LN) idled some of its chrome furnaces for several months. International Ferro Metals said last month it will halt a furnace until March.

The power producer is struggling to meet demand as it builds two new power plants, which are expected to be completed by 2019.

Eskom is spending 337 billion rand ($38.9 billion) over the next five years on the new power stations and to upgrade existing plants. The utility needs to avoid a repeat of 2008 when coal shortages and other issues led to rolling black outs across the country and halted major mining and manufacturing.

Eskom also said it's struggling with the rise in the cost of coal, which it expects to reach 10% a year over the next five years but Nick Holland CEO of Gold Fields Ltd (GFI) said the proposed power rate increases go above and beyond what is needed.

"Eskom needs to be pulled back. It's not necessary to have such high tariffs," he said, saying Eskom is seeking to recover the cost of its investment in power plants over a shorter period of time rather than the life of the plant.

He said there will be no incremental growth in mining investment as a result of the move. You're "going to see rationalization of business.... Projects will go to other countries in Sub Saharan Africa... if you don't have affordable power," he noted.

India-focused Vedanta Resources PLC (VED.LN) which acquired Anglo American's portfolio of zinc assets in Africa in 2011 said the economics of its North Gamsberg project would be called into question if the proposed power tariff increase was implemented.

"We clearly see that South Africa is on the brink of [a power] deficit," said Kishore Kumar, the CEO of Zinc International, Africa & Ireland. "Beneficiation can't happen in this country at that [power] price," he said. Beneficiation refers to the process of refining zinc concentrate into refined products.

Vedanta is planning develop the world's largest undeveloped zinc deposit called the Gamsberg deposit in two phases. The first phase of the project, Gamsberg North, includes an open pit mine, zinc refinery, and smelter that would be able to produce 400,000 tons of refined zinc a year.

Vedanta doesn't have a cost estimate for the project since it is still working on a feasibility study that it plans to submit to Vedanta's board for approval at the end of the year but Anglo American, the project's previous owner, had estimated the cost of developing the Gamsberg project at $2 billion, Mr. Kumar said.

-Write to Devon Maylie at devon.maylie@dowjones.com and Alex MacDonald at

alex.macdonald@dowjones.com

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