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Consultants tell Bainbridge Island council community emissions down since 2014, electricity shift is main driver
Summary
A Cascadia Consulting Group update to the city's greenhouse gas inventory found a 14% drop in total emissions and a 21% drop in per-capita emissions since 2014, driven largely by cleaner electricity; transportation and aviation remain important sources and municipal operations saw a 71% decline.
City consultants told the Bainbridge Island City Council on April 21 that community greenhouse gas emissions have fallen since 2014, with the utility fuel mix change the largest driver of reductions.
“So my name is Andrea Martin with Cascadia Consulting Group. I led this effort, the greenhouse gas inventory update,” the lead consultant said as she introduced the 2023 inventory, which reports both municipal government operations and community-wide emissions for calendar year 2023. The consultants said they used standard protocols and the ClearPath platform consistent with earlier inventories.
The report shows a 14% decrease in overall community emissions and a 21% decline in per-capita emissions since 2014, Andrea Martin said. Much of that change is tied to the electricity sector: “The largest driver of that is just the transition to cleaner electricity sources between those years,” she told council.
The inventory breaks emissions into sectors. Residential electricity accounted for roughly one-third of community emissions in 2023. Transportation remained the other major source: on-road emissions have fallen modestly as vehicles become cleaner, but total vehicle miles traveled increased, while air travel-related emissions rose sharply — the consultants estimated a 49% increase in aviation emissions since 2014 based on county- and airport-level downscaling.
On municipal operations, the consultants reported a pronounced drop: the city's government-operations inventory fell about 71% since 2014. "Facility electricity emissions decreased very substantially due to that green power purchase," Andrea Martin said, noting the city purchases green power for its facilities. Fleet and employee commute emissions have also declined.
Council members pressed consultants on methods and uncertainty. Haley Weinberg, Andrea Martin's colleague, described the approach used to estimate aviation: downscaling SeaTac fuel consumption and passenger surveys to county and then municipal levels, an approach the consultants flagged as approximate. "So it definitely is fairly downscaled," Weinberg said, calling the result an estimate.
Several council members asked whether the trends reflect local policies or broader state and utility changes. "A lot of these reductions we're seeing were maybe due to things outside of your control, like the electricity mix," one council member said. Andrea Martin pointed to state-level mandates and utility programs, including the Clean Energy Transformation Act, as drivers that affect local emissions trends as well as local actions such as green power purchases and teleworking.
Why it matters: The inventory gives the city updated baseline data to track progress toward the climate action plan and to identify the sectors where local policy and programs — such as building electrification, transportation planning, and waste management — can most productively focus future efforts.
What happens next: Councilmembers and staff said the city's climate manager will follow up with program-level analysis and that consultants will provide more technical detail on request. The council deferred a fuller discussion with the climate action manager until that staff member can present.
(Reporting note: Quotes are from the council meeting transcript and are attributed to the speakers who appear in the official meeting record.)
