Oʻahu: Waste to Energy
Through incineration, Oʻahu’s H-POWER facility, working in tandem with recycling, is making a significant impact on the City and County of Honolulu's goal of reducing the amount of waste going to Oahu’s landfill. In 2016, more than 746,000 tons of municipal solid waste was processed through Oʻahu’s H-POWER facility, of which 524,000 tons was converted to electricity, over 24,000 tons of metal were extracted for recycling, and the remaining 186,000 tons consisted of non-combustible material that was sent to the landfill.
H-POWER reduces the weight of waste by 75% and the volume of waste by 90%. This has extended the life of the landfill by saving hundreds of acres of landfill space. Plus, virtually 100% of the ferrous and nonferrous metal mixed with municipal solid waste is recovered for recycling (see below for data on Recovered Metal).
Note: Tonnage data is gathered from independently certified scales.
Total Waste Converted to Energy
In 2016, H-POWER converted nearly 524,000 tons of waste into electricity, effectively diverting that material from Oahu’s landfill. Moreover, working in tandem with recycling, H-POWER was able to divert 75% of Oahu’s solid waste stream from disposal at the landfill. Oahu’s 75% landfill diversion rate is up from about 68% in 2012 and 62% in 2009. As municipal solid waste rates continue to rise, the City expects an increase in the amount of waste sent to H-POWER and the amount of electricity the facility is able to generate, further reducing the island's dependence on foreign oil for its energy needs.
Ash + Residue
At H-POWER, ash is produced as an end product of the combustion process. It consists of bottom ash (coarse in size) and fly ash (finer particles). Bottom ash is screened through a drum magnet and eddy current separator for ferrous and non-ferrous metal recovery. Both bottom and fly ash are containerized and transported to the landfill for disposal.
Residue consists of wet organics such as food waste and other non-combustibles such as sand, dirt, grit, glass, and rocks. This material is removed through a trommel screening process because of its low energy value. Although residue is currently being disposed of at the landfill, initiatives are being considered to further reduce the amount of residue.
H-POWER’s pre-processing system uses magnets to pull ferrous metals, such as steel, from the waste stream prior to incineration. Eddy current separators are used to extract non-ferrous metals, such as aluminum and copper, from the ash. This system diverts over 24,000 tons of metal to recycling annually.
Fossil Fuel Imports Avoided
The above graph represents the amount of fossil fuel (petroleum) that HECO would have to import to generate the same amount of electricity that H-POWER generates with waste. Quick fact: Burning one ton of mixed Municipal Solid Waste produces roughly the same amount of electricity as burning one 42-gallon barrel of petroleum. (Source: State of Hawaii and Hawaiian Electric.)
Total Electricity Generated from Waste
The above graph shows the total amount of electricity produced by H-POWER and sold to HECO through a joint power purchase agreement. The State counts the electricity generated at H-POWER towards its Renewable Energy Portfolio Standards goal (40% renewable energy by 2030), which includes other renewables, such as residential and commercial solar panels, biofuels, wind, hydro, geothermal, and biomass.(Source: State of Hawaii and Hawaiian Electric.)
H-POWER’s CONTRIBUTION TO OAHU’S ENERGY GRID
The above graph shows the percentage of H-POWER's contribution to Oahu’s energy grid. In 2016, the amount of energy produced at H-POWER contributed to 6.9% of HECO’s grid. By reducing our energy consumption, we are increasing H-POWER’s share of energy on the HECO grid, which translates to buying less and burning less imported fossil fuel. (Source: State of Hawaii and Hawaiian Electric.)
To learn more about H-POWER and its success of diverting hundreds of thousands of tons of waste from Oahu's landfill each year, visit the following websites: