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In this article, we explore the sustainability potential of an alternative commons-based mode of production called cosmolocalism. Cosmolocal production combines global knowledge production with local physical production. Such a production mode has been applied across the globe for locally manufacturing small wind turbines (SWTs) for rural electrification. We assess the sustainability of such cosmolocal SWTs in a case study of electrifying a rural community in Ethiopia. In this context, the life cycles of five SWT alternatives have been compared, ranging from conventional industrially produced turbines to open-source locally manufactured and maintained ones. Our case study indicates that the local manufacturing and maintenance of SWTs offer significant advantages and may redeem small wind turbines as a sustainable component for rural electrification. Specifically, the fully cosmolocal alternative (A1) performs better than any other alternative in technical, environmental, and social criteria, while it is close to the best-performing alternative with regard to economic objectives. For this solution to be implemented, the institutional burden cannot be neglected, but can rather be considered a sine qua non condition for locally manufactured and maintained SWTs. A set of generic institutional interventions to create favourable conditions for cosmolocal production is proposed, which needs to be elaborated in a context-specific manner. [ABSTRACT FROM AUTHOR]

During the last decade, the local manufacturing of small wind turbines has become a common approach in rural electrification applications, especially among international networks of renewable energy practitioners. Locally manufactured small wind turbines (LMSWTs) used in off-grid battery based renewable energy systems, typically utilize coreless axial flux permanent magnet generators (AFPMGs) due to their simple manufacturing. Typically, low cost three phase uncontrolled diode bridge rectifiers are used for the direct coupling of the AFPMG to the battery bank, which increases significantly the total harmonic distortion (THD) content in the stator current. LMSWT users have occasionally reported AFPMG noise as contributing to the overall acoustic noise emissions of the small wind turbine, especially during low wind speeds. In this paper the relation between current harmonics and acoustic noise emissions in AFPMGs is investigated and verified experimentally, while appropriate passive filtering techniques are utilized in order to reduce their effect. Furthermore, the overall acoustic noise emissions of a LMSWT are measured experimentally in the field and are compared to noise standards for residential areas. Finally, electromagnetic and aerodynamic sources of acoustic noise are investigated experimentally in the field, while design recommendations are developed for LMSWTs towards the reduction of acoustic noise emissions. [ABSTRACT FROM AUTHOR]