Caldwell said Oahu generates about 1.2 million tons of trash each year, with only 71,000 tons of municipal solid waste ending up in the landfill. The bulk of what is sent there now is ash from the burning of garbage at H-POWER. The mayor wants to continue to divert trash from Waimanalo Gulch and find ways to re-use the ash, eventually eliminating the need for an everyday landfill.