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2.1 Greenhouses at Chena Hot Springs Resort Chena installed a small test greenhouse in 2004, which has operated year-round and is heated entirely with water from the geothermal resource. The resort was able to maintain greenhouse temperatures of 78°F while outside temperatures dropped to a low as -56°F, which is typical for Interior Alaskan winters. The 134°F temperature differential recorded was the largest temperature difference for any controlled environment production facility in the U.S. In 2006, CHSR constructed a new 4,320ft2 hydroponic production greenhouse and in 2007 a 1,680ft2 add on to provide the resort’s restaurant with a greater variety of fresh produce on a year-round basis. Heat for the 6,000 ft2 greenhouse is supplied through 155°F geothermal water pumped from a shallow well as part of an extensive district heating system. Electricity is provided by the geothermal power plant. The reduction in electricity cost combined with geothermal heating made the greenhouse expansion possible. The greenhouse has been expanded from a collaborative three year project with the University of Alaska Fairbanks to assess the feasibility of local onsite food production at remote and semi- remote sites in Alaska. It is the only year-round production greenhouse facility in Interior Alaska. The greenhouse was built using a Poly-Tex, Inc. (Castle Rock, Minnesota) structure 60ft x 72ft in size. The crop production takes place hydroponically, using a nutrient film technique, where the water is constantly flowing through the hydroponic system and the rock wool, allowing the plants to absorb nutrients and water through the roots. The greenhouse environment is computer controlled with temperature and humidity adjusted automatically. The water is monitored for pH and nutrient concentration to provide the lettuce plants with optimal amounts. The 60ft x 28ft add on is used as a nursery to start seedlings, and as an air mixing zone in the winter to pre-warm the cold outside air before it enters the main greenhouse. The greenhouse is divided into two sections with lettuce (Figure 1) and tomatoes (Figure 2). Production is sufficient to meet the demand of the resort’s kitchen year-round. 3PDF Image | ECONOMICS OF GREENHOUSE PRODUCTION IN ALASKA
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