The federal government has finished its examination of the potential environmental impacts of 31 ways Hawaii is trying to become more energy-efficient and utilize more renewable energy technologies.

After a nearly five-year review process, the U.S. Department of Energy on Thursday released its final programmatic environmental impact statement, or PEIS. The 1,500-page report looks at everything from seawater air conditioning and photovoltaics to inter-island cables and liquefied natural gas.

The information is to be used by decision-makers, developers and regulators in determining the best activities and technologies to meet future energy needs and to help the public better understand the potential impacts associated with the various technologies.

The Kaheawa wind farm on Maui.

Forest and Kim Starr/Flickr

The report is timely, given the uncertain future of the electric utility monopoly that provides power to Oahu, the Big Island, Maui, Lanai and Molokai. State regulators expect to decide by June whether to approve the proposed $4.3 billion sale of Hawaiian Electric Industries to NextEra Energy.

In 2008, Hawaii set a goal of meeting 70 percent of the state’s energy needs by 2030 through energy efficiency and renewable energy. The state has since set mandates on the electricity generation front to help achieve that goal, most recently targeting 100 percent renewable energy by 2045.

There’s been significant debate over how Hawaii might use LNG, geothermal, solar, wind or other technologies to kick its oil addiction. The state relies on petroleum products for 85 percent of its energy needs.

“Roughly equal amounts of petroleum are used for electricity generation, ground transportation, and commercial aviation (about 28 percent each), with the rest used for marine transport, military, and other uses,” according to the PEIS.

When it comes to electricity generation, Hawaii relies on imported oil to generate 74 percent of its energy needs whereas the mainland uses less than 1 percent, the report says, noting that Hawaii’s electric rates are triple the national average.

Read the full report below.