Northwest Arctic Borough, Alaska · 66.85°N · 162.60°W

Kotzebue: wind turbines on warming permafrost

Operating wind
1.8 MW
2 × EWT DW54 (2012)
First on tundra
1997
AOC 15/50, 21-yr lifespan
Ground temps
−3.5 to −0.8 °C
N. Seward Peninsula (Debolskiy 2020)
Projected thaw
up to 70%
discontinuous-PF zone with taliks by 2030

Will my wind turbine fall over due to permafrost thaw?

No*

* Not today. The thermosyphon design should keep the ground frozen based on current temperatures.

Turbine foundations
Engineered
Engineered for warming permafrost. KEA uses freeze-back pilings paired with passive thermosyphons that hold foundation soils colder than ambient permafrost. Foundation sensors were installed; no public record of measured temperatures or foundation distress has been released.
Surrounding infrastructure
Watch
On the rest of the wind-farm site, access roads are sinking and on-site buildings are heaving. KEA has had to relocate connection boxes to keep slack in buried cables (Bergan, RADWIND case study).
30-year operational outlook
Material risk
The foundations are robust only as long as the thermosyphons keep working and KEA can keep cooling the ground faster than the climate warms it. Far-western Alaska air temperatures stepped up 3 °C in 2014–2019 vs. the 30-yr baseline.

How do the thermosyphons work?

KEA pairs each freeze-back piling with a passive thermosyphon, a sealed two-phase heat pipe with a refrigerant inside.

In winter, when the air is colder than the surrounding soil, refrigerant at the buried evaporator absorbs ground heat and rises as vapor. It condenses against the radiator fins exposed to cold air, falls back as liquid, and the cycle drives heat out of the ground.

In summer, when the air is warmer than the ground, the cycle stops on its own. The ground is aggressively cooled every winter and rides on that stored cold through the next thaw season.

The same approach appears in AVEC's Kasigluk and Toksook Bay turbines.

Foundation sensors can monitor thermosyphon effectiveness over time.

Thermosyphon heat pipes along the Trans-Alaska Pipeline
Trans-Alaska Pipeline thermosyphons near Donnelly Dome. Beeblebrox, CC BY-SA 3.0.

Where should I site the next turbine?

Permafrost zone
  • ContinuousNSPF > 90%
  • DiscontinuousNSPF 50 to 90%
  • SporadicNSPF 10 to 50%
  • IsolatedNSPF < 10%
NSPF, Near-Surface PermaFrost probability. MAGT, Mean Annual Ground Temperature.

Source: circumpolar.ai permafrost API.

“You cannot dig a hole in the tundra. You are just going to develop a lake.”

Matt Bergan, former KEA Project Engineer

Background: Seward Peninsula tundra, USGS / Dan Ruthrauff, public domain

How is the air temperature changing?

Kotzebue's mean annual air temperature warmed about 2.7 °C between the 1951 to 1980 baseline (-6.2 °C) and the 2014 to 2023 decade (-3.4 °C).

0 °C-10 °C-8 °C-6 °C-4 °C-2 °C0 °C2 °C4 °C19501975200020252050207521001951 to 1980 baseline (-6.2 °C)todayRCP 4.5 · -0.6 °CRCP 6.0 · 0.4 °CRCP 8.5 · +3 °CAnnual mean air temperature
observed annual (10 yr smoothed) · NOAA NCEI station USW00026616RCP 4.5RCP 6.0RCP 8.5 · SNAP CMIP5 5-model average (decadal)

SNAP / UAF earthmaps.io CMIP5 5-model-average downscaled product (decadal era means).

How big can storm surges get?

Kotzebue Sound only got its own continuous tide gauge in 2003, but the record since then plus the 1974 Bering Sea storm at Nome shows the upper edge keeps moving. The October 2024 event was the first to breach the Kotzebue seawall.

0 ft3 ft6 ft9 ft12 ft197019751980198519901995200020052010201520202025seawall breached above ~4.7 ft (Oct 2024)13.04.14.32.74.24.7Peak surge above MHHW
Red Dog Dock gauge (continuous since 2003, NOAA 9491094)Nome / historicalfederal disaster declared

Peak water levels above MHHW, NOAA Tides & Currents stations 9491094 Red Dog Dock and 9468756 Nome. Disaster declarations from FEMA. 1974 surge per NWS Anchorage.

Is the coast still there?

The Kotzebue waterfront is stable today because of the seawall. The Chukchi-facing coast around the wind-farm corridor is not. BELA barrier islands averaged 1.5 m/yr of erosion 2003 to 2014, and Shishmaref 60 miles west is moving the entire village.

-2.0-1.5-1.0-0.50.0+0.5+1.0stablemean shoreline change, meters per year (negative = erosion)Kotzebue waterfront0.0 m/yrKotzebue airport spit+0.50 m/yrCape Krusenstern-0.13 m/yrCape Espenberg area-0.68 m/yrBELA barrier islands-1.50 m/yrShishmaref (regional reference)-1.60 m/yr

Mean shoreline-change rates from Farquharson et al. 2018 (Marine Geology) and Alaska DGGS RI 2021-3.

What is the wind doing right now?

Live wind forecast from the European Centre for Medium-Range Weather Forecasts (ECMWF).

What else should I be watching?

Access roads and on-site buildings
Kotzebue Sound coastal erosion
Blade icing and extreme cold cutoffs
Barge-season window
Wind resource drift over 30 years
Wind-induced vibrations

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