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The power plant’s generation capacity will be provided by two 15 MWe power plant units, comprised of 2 x 18 MW steam boilers and 2 x 18 MW steam turbines. Each 18 MW boiler unit will be about 34 meters tall and will use stoker-grate technology, which is a robust design suitable for PNG conditions. Each boiler will provide enough steam for an 18 MW steam turbine, this is about 75 tonnes of steam per hour at a high pressure of 1300 psig and temperature 500 degrees Celsius.

Each 18 MW boiler will consume up to 20 bone dry metric tonnes per hour of wood as fuel – about two truckloads of wet wood. The power plant will keep several months of fuel on site to ensure continuous power supply.

While the output from the steam turbine generator set is 18 MW, about 3 MW of electricity are used to run each power plant and process the wood into chips, so each 18 MW boiler and steam turbine set will export a net 15 MW to the grid.

18 MW Sierra Pacific biomass power plant in Aberdeen, Washington State

Example biomass power plant: 18 MW Sierra Pacific biomass power plant in Aberdeen, Washington State

Fuel

The power plant will be fuelled using certified sustainable biomass sourced from PNG Biomass dedicated tree plantations. To ensure fuel security for the power plant between 8 and 12 weeks supply of debarked logs will be stored in the log yard. Logs will be chipped using rotary chip mills prior to burning in the power plant.

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