The Impact of Soil Hydrothermal Properties on Geothermal Power Generation (GPG): Modeling and Analysis

Geothermal power plants have become the main application that utilizes geothermal energy. The utilization of deep geothermal energy adheres great importance to the soil condition. One of the biggest challenges faced by geothermal power plant designers is to reduce the risk of soil exploration. To solve this problem, forecasting by modeling has proven to be an important tool to address the problem. In this research, a geo-model was established by modeling three geological layers with different hydraulic and thermal properties to solve the above dilemma. The layers, elevation, and fault zones were simulated using interpolation functions from an artificial dataset. The coupled porous media flow and heat transfer problem using Darcy’s law, as well as heat transfer in porous media interfaces, were studied. The evolution of the flow field, hydrothermal performance, and temperature gradient were also analyzed for a period of 10 years. The results showed the recoverable thermal energy area gradually moved downwards during the 10-year simulation time. When the distance between the recharge well and the production well exceeded 200 m, the collection efficiency was significantly decreased. After 5 years of extraction, the power generation efficiency of the heat source will be less than 9.75%. These results effectively avoided the exploration cost of geothermal power plant site selection, which is significant for the efficiency improvement of geothermal energy.

Konservasi Energi Panas Sisa Proses Geothermal Power Plant

Kemajuan pesat teknologi berbanding lurus dengan kebutuhan akan energi listrik namun tidak sejalan dengan ketersedian sumberdaya penghasil energi listrik tersebut, untuk itu diperlukan konservasi energi untuk meningkatkan efisiensi dan optimalisasi dari sebuah pembangkit listrik sehingga dapat menunjang peningkatan kebutuhan akan energi listrik. jurnal ini memberikan analisa kelayakan pemanfaatan energi panas sisa proses dari pembangkit listrik geothermal yang menjadi pembangkit utama, Dengan menggunakan System Organic Rankine Cycle (ORC) dengan fluida kerja Iso-Butene, dengan cara menghitung heat balance dari siklus ORC, hingga didapatkan nilai enthalpi dan entropy dari system tersebut sehingga dapat dihitung energi yang dapat dihasilkan oleh turbin ekspansi yang menggerakan Generator, dengan hasil akhir ini tambahan energi yang dihasilkan oleh system ORC

Analysis of Indonesia and New Zealand geothermal regulation

Regulation is the important things as the framework and reference for developer to conduct a business such as geothermal development legally in line. Geothermal regulation is needed in developing geothermal power plant as renewable energy from green energy for cleaner environment. The purpose of this research was to analyse the geothermal regulation in Indonesia and compare with New Zealand regulation. This research was conducted using a qualitative descriptive research method. The data used in this study were taken through in-depth interviews with an expert and literature study from various relevant sources data related with Indonesia and New Zealand geothermal regulation. One of geothermal regulation in Indonesia is related to the Geothermal Working Area (GWA), where basically issued from two regimes of geothermal law, that are GWA formed prior Act No. 27/2003 and GWA formed afterward Act No. 27/2003, those geothermal regulations was changed time by time. While New Zealand has regulations namely Resource Management Act (RMA) 1991 which is the main environmental law in New Zealand. Therefore, from this research was analysed that clear regulation is needed to conduct geothermal development which is more applicable and provide benefits to geothermal developers who are fully supported by the government and stakeholders.

Should drill or shouldn’t drill? Urban and rural dwellers’ acceptance of geothermal power plant in Mount Slamet protection forest, Indonesia

Geothermal is one of the new renewable energy, which is more environmentally friendly than the existing fossil energy and has great potential to become an alternative source of energy in the future. However, the level of social acceptance of geothermal power plants operating in forest areas has not been widely studied. This study aims to reveal the social acceptance of affected residents toward the exploration of Baturaden geothermal power plant, operating in the protection forest area of ​​Mount Slamet. The survey was conducted online to indirectly affected residents living mostly in Banyumas urban areas, while the offline face-to-face survey was administered to the directly affected residents in Sambirata and Karang Tengah villages. A total of 286 samples were analyzed. It was found that the majority of respondents preferred not to continue the establishment of the geothermal power plant, but both rural and urban dwellers have distinctive responses and reasonings. The rural tended to have stronger rejection compared to the urban residents. The acceptance of the project in both groups combined was motivated mainly by the prospect of electricity from more environmentally friendly energy sources and compliance to government policy. Those who refused tend to see from the negative impacts on the disruptions of the daily livelihood in rural areas and environmental damages. Three attitude factors significantly affect the continuation of drilling operation of GPP, namely: economic prospects of geothermal utilization in protection forests, technological optimism to migate the engative impacts, and perceived environmental concerns. To increase the social acceptance, it is suggested that policy makers and energy industry players should integrate the mitigation measures by using more proper technology within the project budget and act harmoniously to increase public awareness of the use of renewable and cleaner energy as well as pay attention to the health, welfare and culture of the local community