Yonki TOD construction in progress

Civil works are nearing completion at the site for the Yonki Toe of Dam (TOD) Power Station.

Japanese firm Daiho Corporation took over civil works construction last year after the previous contractor was terminated for non-performance.

PNG Power CEO Tony Koiri and Daiho’s Project Manager Masamichi Inoue signed a deal on November 18, 2011 to get civil works done for the 18MW power station.

Once civil works were completed by Daiho, PPL and its contractor Nippon Koei will finish off by installing the electrical and mechanical works.

The whole project, now estimated at K75m, is expected to be completed before February 2013.

The TOD power station will comprise of two 9 megawatt (MW) vertical Francis units giving a total station capacity of 21.2MVA. The power station is built to modern principles including high-pressure, low volume turbine control hydraulic systems, digital governor, and static excitation and control systems.

The station will be fully automatic, with remote control dispatch and monitoring from the Ramu Power Station control room. The electrical output from the gensets will be stepped up to the Ramu grid voltage of 132kV via a single step-up transformer and the power station will connect to the Ramu grid via a 1.8km transmission line to the Ramu power station 132kV switchyard.

The transmission line will also carry fibre optic cores in the overhead ground conduction to provide high band-width communication between Yonki TOD and Ramu power station for voice, SCADA, and business computing systems.

New mining developments in the Morobe region, particularly the Hidden Valley Gold Mine project, created the need for additional capacity on the Ramu grid.

PPL identified the Yonki TOD hydro power station as the optimum development to meet the demand within the required timeframe.

After completing the feasibility studies and entering into an agreement to sell power to Morobe Mining Joint Ventures, PPL raised finance for the project from a consortium of PNG-based financial institutions.