Methods to evaluate flow and scaling in geothermal systems with reference to the case: Aluto Langano power plant, Ethiopia

Abstract

The Aluto Langano geothermal power plant in Ethiopia was constructed in 1998 and is the first and only one in the country. There have been problems with the wells and plant equipment that have resulted in the shutdown of the installation. The main problem relates to insufficient steam pressure compared to the original design parameters. To tackle such problems and to maintain stable production, the first step should be thorough re-evaluation of the well output, temperature and pressure profiles in the wells and scaling conditions. It is beyond the scope of this paper to do so. The paper will, however, focus on measurements and calculations that can be applied to such an evaluation. As the training took place in Iceland, data from local wells was used, but with reference to the case of the Aluto Langano power plant. Moreover, this paper tries to identify different approaches to solve the existing and other related problems. The Ethiopian Electric Power Corporation is making an effort to return the plant to its specified output, and operate the field on a sustainable basis; and also to assess the potential for increased power generation from the field.