Future Plans

Honolulu's recycling rates are above the national average and it ranks among the top cities in the country in landfill diversion. Looking forward, continued advances in Honolulu's recycling and waste-to-energy programs will further reduce what goes to landfill in the coming years.

In 2019, 82% of Oahu's Municipal Solid Waste (MSW) was diverted from the Waimanalo Gulch Sanitary Landfill (WGSL) through its robust recycling and waste-to-energy programs. Of the roughly 20% of material being landfilled at WGSL, 14% is ash/residue from H-POWER and 6% is unprocessed MSW.

The City anticipates that little more than ash residue will be disposed in the Waimanalo Gulch Sanitary Landfill in the coming years.   By 2021, the City is hopeful that recycling rates will continue to rebound, buoyed by an improved recyclable commodities market along with increased public awareness and participation.  Furthermore, with the major refurbishment projects completed in early 2018, both the amount and overall percentage of waste processed through H-POWER is to increase.


Projected Waste 2016-2021

Looking further ahead - The largest gains in landfill diversion will be achieved by way of increased throughput at the City's H-POWER waste-to-energy operations. Expansions to H-POWER in 2012 increased the plant’s capacity by an additional 300,000 tons per year. A new sewage sludge receiving station began operation in May 2015 effectively diverting 20,000 tons of sewage sludge and an additional 20,000 tons of bulky waste that had been used to properly settle the sewage sludge in the landfill. All non-hazardous medical waste is now processed through H-POWER. The City is working to redirect additional wastes from the landfill to H-POWER, including Auto Shredder Residue (ASR) (25,000 tons) and special wastes such as bar screenings from the wastewater treatment plants and sludge from rendering plants. The City is also evaluating proposals to reuse H-POWER ash and residue that would divert these materials from the landfill. (H-POWER video and PowerPoint)
How we manage our island’s waste will affect generations to come. The ultimate goal is to minimize the use of landfills to the absolute smallest practical level. Currently on Oahu, both recycling and waste-to-energy divert a majority of the waste from the landfills. Recycling remanufactures waste products into new products. On Oahu, our waste-to-energy facility (H-POWER) enables us to convert garbage into energy, which contributes to our island's energy sustainability. In order to further increase landfill diversion, we must consider how best to utilize our garbage as a resource - to remanufacture new products or generate additional power.
Each Hawaii county is required to submit an Integrated Solid Waste Management Plan (ISWMP) to the State Department of Health every 10 years, and to provide an interim status update report on the implementation of that plan five years after it is submitted.  The City and County of Honolulu finalized the ISWMP in 2018 and will be working on the interim report to submit by 2023.  The City's 2008 ISWMP, the 2013 interim report and the technical studies that contributed to the development of the plan are posted online in the Resource Library, along with previous master plan documents, studies and annual recycling rate data for 1988 to present.

© 2005 City & County of Honolulu's Department of Environmental Services.