ORC Prime Power in Alaska

Application: Engine, Remote Power Generation
Net Output: Three units producing 75 kWe

ElectraTherm commissioned three Power+ Generators to produce fuel-free, emission-free electricity from diesel prime power gensets at the Dutch Harbor power plant in the remote Aleutian islands of Alaska. ElectraTherm’s Organic Rankine Cycle (ORC) generators capture the waste heat from the jacket water of two Wartsila W12V32 and one CAT C280-16 at temperatures as low as 165°F to generate approximately 75 kWe net for the site. The power generated is sent to the grid, where residential costs of power are some of the highest in North America at $.45/kW. The City of Unalaska and the Alaska Energy Authority purchased the three ORC generators to utilize an untapped, existing resource at the power plant. The City of Unalaska estimates approximately $250,000 annual fuel savings.

The Power+ Generators offset the radiators on the gensets significantly; radiator power consumption is reduced by an estimated 8,000 kWh per month, equating to 6,000 gal of fuel saved per year. The reduction of cooling loads is an additional benefit to the electricity generated for profit, equating to a “radiator with a payback.”

The installation in Unalaska is ElectraTherm’s first application on diesel prime power, and ElectraTherm anticipates repeatable opportunities in remote locations where there are diesel reliant rural populations. At the site, hot water enters the Power+ Generators, where it heats a working fluid into pressurized vapor. As the vapor expands, it drives ElectraTherm’s patented twin screw power block, which spins an electric generator and produces power. All three ORC generators utilize one cooling loop, sea water with an input temperature of 45°F.

“I left ElectraTherm [training] with a 100% satisfaction in the product that we have received and the support that comes along with the purchase. ElectraTherm is taking a business approach that tends to have been forgotten today: quality and service first. ElectraTherm’s upfront approach, product quality, customer service and attention to detail far exceed any industry standard.”
-Matthew Scott, Electrical Engineering Technician for City of Unalaska

Read more about the application and ORC waste heat recovery technologies in our feature in POWER Magazine here. or from the official release here.

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