To determine factors controlling permeability variations within and adjacent to a fault-hosted geothermal reservoir at Dixie Valley, Nevada, we conducted borehole televiewer observations of wellbore failure (breakouts and cooling cracks) together with hydraulic fracturing stress measurements in six wells drilled into the Stillwater fault zone at depths of 2-3 km. Measurements in highly permeabl...

In order to face the growing energy demands, renewable energy sources can provide an alternative to fossil fuels. Thus, low-enthalpy geothermal plants may play a fundamental role in those areas— such as the Province of Viterbo—where shallow groundwater basins occur and conventional geothermal plants cannot be developed. Thismay lead to being fuelled by locally available sources. The aim of the ...

The Hellisheidi geothermal power plant, located in Iceland, is a combined heat and double-flash plant with an installed capacity of 303.3 MW electricity 133 hot water. This study aimed to elucidate the environmental impacts production from this plant. In vein, firstly, most updated inventory was generated, secondly, life-cycle assessment approach based on exergy allocation factor carried out in...

The scarcity of water resources on the island Gran Canaria (Canary Islands, Spain) is such that 88% supply for human consumption comes from seawater desalination plants. This type process has a high specific energy consumption. an isolated electrical system low robustness. In this paper, geothermal plant designed and integrated into already non-dispatchable renewable generation (wind photovolta...

The Queensland Government recently awarded A$15 million to the University of Queensland to establish a new “hot rocks” research and development centre, called the Queensland Geothermal Energy Centre of Excellence. The vision for the Centre is to provide urgent, forward looking research, development and support for establishment of geothermal energy as a clean energy option through a program of ...

Ungaran volcano is located in the Central Java, Indonesia. Numerical analysis has performed in order to assess the geothermal potential of Ungaran volcano using a 3-D finite difference simulator HYDROTHERM Ver2.2. A conceptual model constructed based on the results of geophysical studies such as gravity, spontaneous-potential, microearthquake, infrared imagery and shallow ground temperature. De...

Background (Ba,Sr)SO4 solid-solutions range among the most important scaling minerals, not only in geothermal energy production, but generally in applications involving hydrothermal brines, e.g. including petroleum production [e.g. (Todd and Yuan 1990, 1992; Kühn et al. 1997)]. Besides the general difficulties related to scale formation, like blockage of pipes, related decrease of well producti...

This research is concerned with the design and analysis of a geothermal based multi-generation system by applying both conventional and advanced exergy and exergoeconomic concepts. The proposed energy system consists of a dual-organic Rankine cycle (ORC) to vaporize liquefied natural gas (LNG) and produce electricity. A proton exchange membrane(PEM) electrolyzer is employed to produce hydrogen ...

Editorial Topic 4 of the Renewable Energy Program of the Helmholtz Association focusses inter alia on the sustainable and cost-efficient use of geothermal reservoirs for base-load supply of heat and electricity by EGS. Current EGS projects show the limitations of such systems. Firstly, the localization of a potential reservoir prior to drilling still remains a major challenge. Secondly, the min...