The Beluga River rises at Beluga Lake, fed largely by meltwater from the Triumvirate Glacier, and flows roughly 30 miles (48 km) southeast to Cook Inlet, about 46 miles (74 km) north-northeast of Kenai and 35 miles (57 km) west of Anchorage, Alaska. The name was recorded in 1898 by the U.S. Geological Survey and derives from the Russian “byeluga”, meaning “white whale,” after the beluga whales that frequent Cook Inlet. Nearby stood the Tanaina (or Dena’ina) village of Beluga, now reduced to a handful of buildings, about 4 miles (6.5 km) southwest of the river’s mouth and 8 miles (13 km) northeast of Tyonek.
The Beluga River gas field, a shallow accumulation roughly 7.5 miles (12 km) long and 2.5 miles (4 km) wide, was discovered in 1962 while explorers were drilling for a deeper oil prospect. Its trap is a north-northeast-trending fault-propagation fold enclosing a thick basin of sandstone, siltstone, mudstone, and coal. Production began in 1968, and the field has since yielded well over a trillion cubic feet of gas. It is now in late-stage commercial development: many reservoir sandstones have been depleted to less than 40% of their original pressure, and most down-structure wells face water encroachment, a significant operational challenge.
Anchorage Municipal Light and Power (ML&P), then a city-owned utility, bought a one-third stake in the Beluga field in 1996. In 2013 it partnered with Chugach Electric Association to build the Southcentral Power Project, a 183-megawatt gas-fired plant, having earlier expanded its own George M. Sullivan Power Plant in East Anchorage by 120 megawatts. In 2016 ML&P and Chugach Electric jointly bought ConocoPhillips‘s one-third interest in the field; Hilcorp Energy holds the remaining third and operates it on the utilities’ behalf. Combining efficient new generation with utility-owned gas reserves has helped keep power costs down. In October 2020 Chugach Electric completed its acquisition of ML&P for about $986 million, folding Anchorage’s former municipal utility, and its Beluga field stake, entirely into Chugach Electric Association. Read more here and here. Explore more of Beluga River and Cook Inlet here: