BOISE, IDAHO, Aug 01, 2013 (Marketwired via COMTEX) — U.S. Geothermal Inc., (nyse mkt:HTM) CA:GTH -1.96% a leading renewable energy company focused on the development, production, and sale of electricity from geothermal energy, announced () that Final Completion of the 22 megawatt (net) Neal Hot Springs Project has been achieved.
Duane Tilden‘s insight:
>The Neal Hot Springs Project was the first geothermal project to obtain a loan guarantee under the DOE’s Title XVII loan guarantee program, which was created by the Energy Policy Act of 2005 to support the deployment of innovative clean energy technologies. The DOE loan guarantee, guarantees a loan from the U.S. Treasury’s Federal Financing Bank. The project was authorized for a loan guarantee of up to $96.8 million.
The Neal Hot Springs project deployed a first of its kind binary cycle process, utilizing a supercritical cycle that uses R134a refrigerant as the working fluid, as well as pre-fabricated modular construction of major plant components. […]
The project is selling electricity to Idaho’s largest utility, Idaho Power Company, under a previously signed 25-year power purchase agreement for up to 25 megawatts of power per year. Beginning in 2012, the base energy price is $96 per MW Hour and escalates annually. The calculated 25-year levelized price is $117.65 per MW hour.<
Thomas B. Gibbons takes a look at the Conventional Rankine Cycle’s application in the cement sector
Duane Tilden‘s insight:
>The first major waste heat recovery (WHR) system in a cement plant was the 15 MW unit installed by Kawasaki Heavy Industries for Taiheiyo Cement in 1982. This was a conventional Rankine Cycle using heat from both the kiln and the clinker cooler. As the benefits became generally recognised within the industry, WHR units, the vast majority of which involved the conventional Rankine Cycle, were installed to provide up to about 30% of the power requirements of the plant. The main sources of waste heat were the exhaust from both the preheater and the clinker cooler and, in some of the developing countries where power outages are not unusual, the WHR system may be the only source of reliable power available to the plant operator.
Improvement in the overall efficiency of cement manufacture has resulted in lower exhaust gas temperatures and this development has provided opportunities for alternative technologies, notably the Organic Rankine Cycle (ORC) and the Kalina Cycle, which are more effective in recovering waste heat from lower temperature gases.<