Overview
IEC TS 62257-2:2015 - "Recommendations for renewable energy and hybrid systems for rural electrification - Part 2: From requirements to a range of electrification systems" is a technical specification that provides a methodological approach for carrying out socio-economic and preliminary studies within decentralized rural electrification projects. Published by the IEC (Edition 2.0, 2015), the document links user needs and energy demands to a practical range of electrification architectures (individual and collective systems), helping project teams select appropriate renewable energy and hybrid system solutions.
Key updates in this edition:
- Maximum AC voltage redefined from 500 V to 1 000 V
- Maximum DC voltage redefined from 750 V to 1 500 V
- Removal of the 100 kVA system size limitation
Key topics and requirements
- Methodology for non‑technical preliminary studies: guidance on scope, data collection (socio-economic, technical, financial, organizational) and stages of a socio‑economic study.
- User requirements analysis: qualitative (type of use, availability, supply quality) and quantitative demand typologies for households, public services, and productive uses.
- Classification of electrification systems: typologies and selection criteria for individual and collective systems, including isolated systems and microgrids.
- Electrification system architecture: modular presentation of production, distribution and demand/application subsystems; functional diagrams and limits between subsystems.
- Assisted selection of production subsystems: tables and decision logic to match renewable, diesel or hybrid production options to service availability and duration.
- Supply quality indicators and functional diagrams: annexes with examples (REN-only, REN + storage, diesel gensets, micropower plants) and symbols for system design.
Practical applications
- Translate community energy needs into technically and economically feasible electrification options.
- Design decentralized renewable and hybrid systems (solar, wind, hydro, diesel hybrids) and microgrids adapted to rural contexts.
- Define service levels, availability targets and supply-quality indicators for project proposals, tender documents and feasibility studies.
- Support financial analysis, organizational planning and stakeholder engagement for rural electrification programs.
Who should use this standard
- Project teams and field practitioners working on rural electrification
- Socio‑economic study experts and energy planners
- Renewable energy and microgrid system designers and engineers
- NGOs, development agencies, utilities and funders evaluating decentralized electrification options
Related standards
- Read in conjunction with the IEC 62257 series for broader recommendations on renewable energy and hybrid systems for rural electrification, and other IEC standards referenced within the technical specification.
Keywords: IEC TS 62257-2:2015, rural electrification, renewable energy, hybrid systems, decentralized electrification, socio-economic studies, microgrid, electrification system architecture.