IEC TS 62257-1:2003

Recommendations for small renewable energy and hybrid systems for rural electrification - Part 1: General introduction to rural electrification

Introduces general considerations on rural electrification and the IEC 62257 series. This series intends to provide to different players involved in rural electrification projects specifications for the setting up of low voltage renewable energy and hybrid systems.

General Information

• Status: Published
• Publication Date: 10-Aug-2003
• ICS: 27.160 - Solar energy engineering
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Current Stage: DELPUB - Deleted Publication
• Start Date: 14-Oct-2013
• Completion Date: 14-Feb-2026

Relations

• Revised: IEC TS 62257-1:2013 - Recommendations for small renewable energy and hybrid systems for rural electrification - Part 1: General introduction to IEC 62257 series and rural electrification
• Effective Date: 05-Sep-2023

Overview

IEC TS 62257-1:2003 provides critical guidance for stakeholders involved in rural electrification through small renewable energy and hybrid systems. Developed by the International Electrotechnical Commission (IEC), this Technical Specification is the introductory document of the IEC 62257 series. It outlines the fundamental considerations for rural electrification, particularly in cases where connection to the national or regional electrical grid is impractical due to distance, cost, or low electricity demand.

The document targets a wide range of professionals such as project developers, implementers, planners, and installers who are focused on deploying low-voltage electrification systems (below 500 V AC, 50 V DC, and 50 kVA power) for underserved rural areas, with an emphasis on developing countries. By offering a foundation for system selection, design, operation, and maintenance, IEC TS 62257-1 supports the reliable integration of renewable energy technologies and hybrid solutions into rural infrastructure.

Key Topics

• Rural Electrification Strategy: Emphasizes the importance of a master plan that balances long-term goals with cost-effectiveness, sustainability, and local community needs.
• Grid and Off-grid Assessment: Explores decision-making criteria for using either national/regional grids or autonomous off-grid solutions based on technical, economic, and sociological factors.
• Decentralized Systems: Introduces two main models:
  • Individual Electrification Systems (IES): Stand-alone systems for single households or isolated users.
  • Collective Electrification Systems (CES): Microgrids serving multiple users or entire villages.
• System Topologies: Describes key components such as micropower plants (generation), microgrids (distribution), and end-user subsystems.
• Energy Efficiency: Recommends the use of low-consumption appliances and efficient loads, such as high-efficiency lighting, for enhanced sustainability and cost control.
• System Selection: Provides guidance on evaluating long-term demand, demographic growth, and economic development to determine appropriate technologies and delivery models.

Applications

The practical utility of IEC TS 62257-1 extends across diverse rural electrification initiatives:

• Project Planning: Enables developers and policymakers to assess, plan, and prioritize electrification efforts using comprehensive data, including socio-economic and geographic information.
• System Design: Assists engineers and implementers in selecting suitable renewable energy or hybrid configurations tailored to specific local requirements.
• Deployment: Supports the implementation of microgrid solutions or stand-alone systems where grid extension is unfeasible.
• Operation and Maintenance: Outlines best practices for the sustainable management and maintenance of decentralized energy systems in rural contexts.
• Community Development: Facilitates improved access to reliable electricity, bridging gaps in healthcare, education, entrepreneurship, and overall quality of life in rural populations.
• Cost Management: Promotes the adoption of low power equipment and scalable solutions that optimize life cycle cost and operational efficiency.

Related Standards

IEC TS 62257-1:2003 serves as the foundation for the broader IEC 62257 series, each focusing on specific aspects of small renewable and hybrid systems for rural electrification:

• IEC 62257-2: From requirements of users to a range of electrification systems
• IEC 62257-3: Project development and management
• IEC 62257-4: System selection and design
• IEC 62257-5: Safety rules
• IEC 62257-6: Acceptance, operation, maintenance, and replacement
• IEC 62257-7 to IEC 62257-12: Technical specifications for subsystems (generators, batteries, converters, integrated and grid-connected systems, and more)

Conclusion:
IEC TS 62257-1:2003 is an essential reference for effective rural electrification. By providing a structured methodology for planning, selecting, and deploying low-voltage renewable energy and hybrid systems, it supports sustainable development and the expansion of energy access in off-grid and remote regions. Leveraging the entire IEC 62257 series ensures best practices for safety, efficiency, and long-term success in rural energy projects.

Standards Content (Sample)

IEC/TS 62257-1 ®
Edition 1.0 2003-08
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for small renewable energy and hybrid systems for rural
electrification –
Part 1: General introduction to rural electrification

IEC/TS 62257-1:2003(E)
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IEC/TS 62257-1 ®
Edition 1.0 2003-08
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for small renewable energy and hybrid systems for rural
electrification –
Part 1: General introduction to rural electrification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
L
ICS 27.160; 27.180 ISBN 2-8318-7162-X

– 2 – TS 62257-1  IEC:2003(E)
CONTENTS
FOREWORD . 3
INTRODUCTION .5
1 Scope and overview . 6
2 Normative references. 6
3 Terms, definitions and abbreviations . 7
4 Rural electrification: which solution to choose?. 8
5 Decentralized electrification requires a range of systems . 9
Figure 1 – Example of electrification progress following a master plan methodology. 9
Table 1 – Some advantages and disadvantages of the proposed single and multiple
user systems.10

TS 62257-1  IEC:2003(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY
AND HYBRID SYSTEMS FOR RURAL ELECTRIFICATION –
Part 1: General introduction to rural electrification
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62257-1, which is a technical specification, has been prepared by IEC technical committee
82: Solar photovoltaic energy systems. It was developed in cooperation with other IEC
technical committees and subcommittees dealing with renewable energies and related matters,
namely technical committee 21 ("Secondary cells and batteries"), subcommittee 21A
("Secondary cells and batteries containing alkaline or other non-acid electrolytes"), technical
committee 64 ("Electrical installations and protection against electric shock"), technical
committee 88 ("Wind turbines"), and others.

– 4 – TS 62257-1 © IEC:2003(E)
This document is based on IEC/PAS 62111; it cancels and replaces the relevant parts of
IEC/PAS 62111.
This technical specification shall be used in conjunction with the other documents of the
IEC 62257 series.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
82/300/DTS 82/318/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2006.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this publication using a
colour printer.
TS 62257-1  IEC:2003(E) – 5 –
INTRODUCTION
Rural electrification is one of the predominant policy actions designed to increase the well-
being of rural populations together with improved healthcare, education, personal advancement
and economical development.
The present document introduces general considerations on rural electrification and the
IEC 62257 series. This series intends to provide to different players involved in rural
electrification projects documents for the setting up of low voltage renewable energy and
hybrid systems.
– 6 – TS 62257-1  IEC:2003(E)
RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY
AND HYBRID SYSTEMS FOR RURAL ELECTRIFICATION –
Part 1: General introduction to rural electrification
1 Scope and overview
Rural electrification is one of the predominant policy actions designed to increase the well
being of rural populations together with improved healthcare, education, personal advancement
and economical development. Rural electrification can be completed through connection to a
national or regional electrification grid. This document applies to cases where the grid is too far
away (too costly) or the individual demand centres are too small to make grid access
economic, where autonomous power systems may be used to supply these services.
This series of documents intends to provide to different players involved in rural electrification
projects (such as project developers, project implementers, installers, etc.) documents for the
setting up of renewable energy and hybrid systems with AC voltage below 500 V, DC voltage
below 50 V and power below 50 kVA.
These documents are recommendations:
a) to choose the right system for the right place,
b) to design the system,
c) to operate and maintain the system.
These documents are focused only on rural electrification concentrating on but not specific to
developing countries. They must not be considered as all inclusive to rural electrification. The
documents try to promote the use of renewable energies in rural electrification; they do not
deal with clean mechanisms development at this time (CO emission, carbon credit, etc.)
Fu
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