KOOSKIA NATIONAL FISH HATCHERY

Recirculation incubation chiller system

Reservoir

Reuse water aeration column

Well water make up column

Two stage chiller unit

Recirculation pumpsInput well water

1,000 gal

Controller for the two 7 1/2 hp motors Flow meter

Average cost per month to operate the large chiller and hatchery power is $12,368.19Average cost per month to operate the small chiller and hatchery power is $4,710.28

The Difference in cost per month is $7,657.91The large chiller is operated four months of the year by itself and three months in conjunction with the small chiller. The small chiller is operated five months of the year by itself.Cost saving calculated by Avista Power

• Monthly energy savings with new system 94,107 kW hr/month• Monthly demand savings with new system 129 kW/month• Monthly energy cost Savings $5,866/month• Monthly demand cost savings $612/monthBased on the Avista cost savings estimations, the new system saves us approximately……..

$29,330/year

First year of full incubation at Kooskia National Fish Hatchery

Total eggs on station 764,546

Total eyed-eggs on station 729,476 Percent eye-up 95.4

Total hatch 716,077 Percent hatch 93.66

Advantages• Water is recirculated• Only 10 gallons/min is added into the system at all times• Going to a smaller chiller system has saved us $$$$$• Ability to control water temperature to the Heath stacks

Disadvantages• Having to be more diligent in making sure that chemicals are discharged

out of the system• More time consuming for personnel to perform egg treatments• Inability to adjust individual stack temperatures