About Our Network
National Grid
There is at present no national grid system due mainly to challenges posed by PNG's difficult topography as well as vast distances between various towns or load centres. PPL nonetheless has plans to interconnect the Ramu and the Port Moresby systems. The project however depends entirely on the planned construction of a trans-island road to link the New Guinea Highlands to Papua, which itself has not eventuated.
PNG Power electricity generation uses both hydro electric generation and thermal generation (generally diesel powered) plant to supply power to its customers. The grid systems of Port Moresby, Ramu (Lae, Madang and the Highlands) and Gazelle in East New Britain have hydro generation that supplies the bulk of the power. Overall, hydro supplies about 65% of the PNG Power power requirements. The regional centres that are not connected to these power grids rely on diesel powered thermal generating plant.
PNG Power continues its extensive refurbishment and upgrade program of the generation facilities to improve the reliability and quality of supply at all its centres throughout PNG. In Port Moresby, PNG Power signed a major contract to refurbish the Rouna 2 hydro power station. In the regional centres, PNG Power continues to upgrade the diesel powered thermal generation where plant had not been replaced or refurbished previously because of the poor financial state of the business.
Port Moresby System
The Port Moresby system serves the National Capital District, the commercial, industrial and administrative centre of Papua New Guinea. The Port Moresby system also serves surrounding areas in the Central Province.
The main source of generation is the Rouna system consisting of four hydro stations on the Laloki River, controlled water storage in Sirinumu Reservoir and a small generating set at the toe of Sirinumu dam. The total generation capacity from the Rouna Power Stations is 62.2MW.
PNG Power also operates a thermal power station at Moitaka, outside Port Moresby which is also used to supplement the supply from the Rouna Power Station with a generation capacity of 30MW.
PNG Power also purchases electricity from a privately owned power station at Kanudi. The Kanudi Power Station completed in January, 1999 is owned and operated by an IPP, selling power exclusively to PNG Power. Kanudi adds another 24 MW to the Port Moresby system generation capacity and is being utilised as base load.
The load demand for the National Capital District is 73.5MW.
The Port Moresby hydro generation is transported by three 66kV lines and a 33kV feeder and the Moitaka thermal generation output is delivered to the system at Boroko via a single and a double circuit 66kV lines which also supply Waigani Substation. There is also a 66kV circuit line from Moitaka to Kanudi to improve the security of power supply.
Ramu System
The Ramu system serves the load centres of Lae, Madang and Gusap in the Momase Region and the Highlands centres of Wabag, Mendi, Mt Hagen, Kundiawa, Goroka, Kainantu and Yonki. The economy of the regions supplied by the Ramu system is based on mining, oil, gas, coffee, tea, timber and industrial productions.
The main source of generation is the Ramu Hydro Power Station with an installed capacity of 75MW, comprising of five units of 15MW each. This station which was previously a run-of-river scheme became a storage scheme when the Yonki dam was commissioned in February, 1991.
Additional hydro energy is supplied by Pauanda, a run-of-river station in the Western Highlands Province with 12MW.
Power is also purchased when required from the privately owned Baiune Hydro Power Station at Bulolo in Morobe Province, and varies between 1 to 2 MW depending on availability.
Transmission line outages, energy and peak demands are met by diesel plants at Madang, Lae, Mendi and Wabag. These plants serve as stand-by units.
Three radial lines originating from Ramu Hydro Power Station switch yard serve Lae, Madang and the Highlands centres. Currently Madang and the Highlands Region are supplied at 66kV and Lae at 132kV. The Highlands line interconnects with Pauanda hydro station and supplies the townships of Kainantu, Goroka, Kundiawa, Mt Hagen, Wabag and Mendi.
Gazelle Peninsula System
The Gazelle Peninsula system serves the townships of Rabaul, Kokopo and Keravat to service Gazelle's economy based on copra, coconut oil, cocoa, timber and fishing.
The Gazelle Peninsula system is powered by a 10MW hydro power system at Warangoi, Ulagunan Diesel Power Station with 8.4MW, and 0.5MW from Kerevat Diesel Power Station.
A 66kV line linking Warangoi to the Rabaul, Kokopo and Kerevat zone substations delivers hydro power from Warangoi Power Station to these load centres.
Other Centres
The remainder of the centres are served by diesel generating stations except for the Kimbe system which is supplied by the Ru Creek Mini hydro system and the Bialla system is supplied by Lake Hargy mini hydro scheme.
PNG Power took over the supply of electricity to several or District centres in recent years as part of its rural electrification program.
