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State utility Perusahaan Listrik Negara has inaugurated a fourth unit at the Tanjung Jati coal-fired power plant in Jepara, Central Java, adding 662 megawatts of electricity to the Java-Bali grid, the company said on Sunday.

The fourth unit brings Tanjung Jati’s power-generating capacity to 2,640 MW, PLN spokesman Bambang Dwiyanto said.

This is equivalent to about 12 percent of the peak load on the Java-Bali grid, which is 19,700 megawatts.

PLN has frequently struggled to power the nation as demand outstrips supply. The Jakarta-based company is tasked with providing an additional 55,500 MW of power nationwide by 2019.

The first two units at Tanjung Jati have been up and running since 2006. The third unit was inaugurated last December.

This newest unit at Tanjung Jati will be operated by Central Java Power, which will sell the electricity to PLN for 20 years. After that, PLN will take ownership of the unit.

The electricity from the Tanjung Jati plant goes to customers in Java and Bali.

The Java-Bali power grid has suffered numerous problems with its transformers, resulting in rolling power cuts that have angered business owners who say the unsteady electricity supply hurts their bottom line.

According to a report in Bisnis Indonesia daily on Jan. 16, the cost of the third and four units at Tanjung Jati was Rp 20 trillion ($2.2 billion).

Agung Ambara, general manager at PLN for the Tanjung Jati plants, told the newspaper that the utility had secured the needed coal supply for the plant.

He said PLN had secured 700,000 tons of coal a month, more than the 400,000 tons needed.

To government is seeking to add another 30,000 MW of power by 2014 through a fast-track program. It plans to generate that from coal, geothermal and hydropower.

Total investment in the two-phase program is estimated at about $26 billion.

The country is increasing its efforts to increase the number of households with electricity and reduce power outages.

Currently, Indonesia’s electrification rate stands at 65 percent, meaning that 65 percent of households have access to power.