China's four power giants may have lost up to 7 billion yuan ($1.02 billion) in the first half of this year due to soaring coal prices, Shanghai Securities News reported on Wednesday.

China Guodian Corporation (CGD) and China Huadian Corporation (CHD) recorded losses of 1.4 billion yuan and 2.65 billion yuan, respectively, in the first six months, the report said, quoting unpublished figures.

China Datang Corporation lost 1.479 billion yuan between January and May. Experts estimated Datang's loss for the January-June period would amount to 2 billion yuan.

No figures were available for the China Power Investment Corporation, but the report quoted industrial sources as saying that the company may have lost 1 billion yuan.

A China Galaxy Securities analyst said coal-fired power plants, which supply 78 percent of the country's electricity, were pinched by soaring coal prices, government control of electricity prices, as well as the rising financial costs resulting from expanding investment and the country's tight monetary policy.

On July 1, the government raised electricity prices by 0.025 yuan per kWh for industries. But electricity price for homes remain unchanged.

The price increase, however, could only cover 15 percent of the losses in coal-fired power plants, said a Citic Securities analyst.

To meet listing requirements, these power giants did not slow their expansion pace despite heavy losses, China Business News reported last week.

Guodian put into production a capacity totaling 1.707 million kw in the first half. Huadian generated 25.11 percent more electricity than the same period last year (no statistics of its electricity output was available). Datang and China Power Investment produced about 165.794 billion kwh and 99 billion kwh between January and June, 17.7 percent and 15 percent higher year on year, respectively.

An industry insider said Huaneng was the only one of the country's five power giants that didn't run at a loss in the first half. An anonymous Huaneng executive confirmed it did garner marginal profit over the six months, but he didn't reveal any data about the gains.

Some industry observers attributed the gain partly to the unbalanced assets distribution of the 2002 reform of the country's power industry. At the time, Huaneng was given less financially burdensome obsolete power plants than the other four.

The reform aimed to promote competition by breaking up the State Power Corporation, which has a virtual monopoly in the sector, into five power generation groups and two grid companies.