National Approaches to Electrification – Technology
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![National Approaches to Electrification – Technology Page.png]]](/images/thumb/0/0c/National_Approaches_to_Electrification_%E2%80%93_Technology_Page.png/800px-National_Approaches_to_Electrification_%E2%80%93_Technology_Page.png) |
Technology: The physical means by which electricity is generated, transmitted and distributed
Grid-connected mini-grids and distribution systems share characteristics with both Grid Extension and Isolated Mini-grids – They are linked to the grid system and are able to import electricity from and export electricity to it, so technically they have more in common with Grid Extension. However, in that they are owned and managed independently they are more similar to Isolated Mini-grids. These differences call for different policy and regulatory approaches, so a separate Technology category has been established.
Grid Extension
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Definition: |
Establishment and extension to new users of a system that connects electricity generation plants to consumers via a transmission and distribution network across the country. Grid systems draw on a variety of generation sources, from nuclear and hydro-power to coal, oil and combined-cycle gas turbines and solar- and wind-power. Each form of generation has different characteristics in terms of flexibility, reliability and costs. A mix of generation sources is required to match generation to demand, with over-reliance on any one form of generation risking lengthy outages (for example, a drought can significantly affect a predominantly hydro-powered grid system). Technology advances, combined with environmental concerns, have led to an increasing focus over recent years on Renewable Energy based generation. Transmission and distribution system designs also vary, with low-cost distribution technologies such as Single Wire Earth return (SWER) being used to reduce costs in remote areas. |
Internactions wiht other NAE Categories:
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Delivery Model
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The national grid system may be publically or privately owned or combine both in a public-private partnership. Common public-private models for grid systems include:
(Where individual distribution areas are separately owned, eg by municipalities or regional bodies, these may be regarded as grid-connected distribution systems and are discussed under that category). | |
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Legual Basis
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Grid systems almost always act as monopoly concessions (because of the need to balance demand and supply across the system in real-time, and the substantial investment required to establish and maintain the infrastructure). As a result, the right to transmit and sell electricity is often reserved to the national grid utility or company (at least within the area reached by the grid system). | |
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Price/Tariff Regulation
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In line with the nature of the national grid as a single coherent system, uniform tariffs are almost invariably charged across the system (though often with different tariffs for different classes of user and levels of usage, or in some cases time-of-use pricing). Electricity prices are a highly political issue in almost every country, and therefore there is almost always some oversight of these tariffs. Without explicit regulation there is a risk of political pressure leading to tariffs which fail to cover costs, and hence system deterioration. | |
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Finance
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Almost all national grid systems (including those in developed countries) are constructed using public funding, drawing on government funds sometimes supplemented by concessionary loans and grants from international agencies. Where the grid system is (wholly or partially) privately owned (often as the result of a privatisation process), private investment in infrastructure may be leveraged by subsidies (egfor connection charges). User charges are the other main source of grid system funding, and uniform tariffs mean that some element of cross-subsidy is inherent in grid-based electricity provision, with users who are more expensive to supply being subsidized by those who can be supplied more cheaply. | |
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Non-Financial Interventions
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National energy planning is key to establishing the economically optimum extent of the grid. Institutional restructuring, regulatory reform and policy and target setting may all be beneficial in creating the institutional and policy basis for grid extension. Capacity building or technical assistance may be needed where the key actors involved in grid extension lack capacity. Technology development/adoption and adoption of appropriate technical standards can enable grid extension at lower cost (as shown in the NAE Case Study:Tunisia where adoption of standards allowing MALT (Mise A La Terre) distribution lowered costs), while demand promotion may be needed to increase revenues and make it economically sustainable. |
Advantages and Disadvantages (Including Level of Electricity Provided)
|
Grid extension (combined with construction of additional generation capacity) is particularly appropriate for densely populated areas with higher demand levels, close to the existing grid system. Grid systems provide the ability to build large, efficient generating plants in optimum locations, and make use of economies of scale. These economies may, however, be overwhelmed by the costs of the transmission and distribution infrastructure needed for smaller, more remote communities where mini-grid and off-grid technologies may provide better solutions. Significant extension of the grid also calls for a series of major infrastructure projects, requiring planning, procurement and project management capabilities and is therefore often a lengthy exercise, meaning that other solutions, even if more expensive, may merit consideration as a means to achieve electrification more quickly. Grid systems are usually designed to provide a high level of electricity, suitable to serve all household, commercial, industrial and community requirements (Tier 51). However, where generation is inadequate (or liable to interruption); or transmission and distribution systems are insufficiently robust or poorly maintained; reliability and quality of supply may deteriorate. Thus while users have a physical connection to the grid, they may not in fact have reliable access to electricity (bringing the supply Tier 3 or lower). It is therefore important to couple grid extension with development of additional generation capacity to support the resulting additional demand. |
Further Informaiton and Guidance
|
Relevante Case Studies:
- Rwanda, Sector-Wide Approach to Planning
- South Africa, Integrated National Electrification
- Tunisia, Low Cost Distribution Technology
Grid-Connected Mini-Grids/Distributed System
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Definition: |
An electricity system connected to, but owned and/or separately managed from, the main grid system which supplies electricity to users within a local area. Grid-connected mini-grids and distribution systems exist at a wide range of scales from those supplying a few households to systems covering entire districts or regions. The term “grid-connected mini-grid” is most frequently used to refer to systems built around their own, usually small-scale (diesel, bioenergy, biomass, hydro, solar, wind or hybrid) generation and connected to the grid to allow import and export of electricity. While these include fossil-fuel based generation, technology advances combined with environmental concerns mean that policy-makers are increasingly focussing on encouraging Renewable Energy based generation. A “distribution system” generally refers to a larger system designed primarily to distribute electricity from the main grid system to users. However distribution systems often also include their own generation and there is no clear distinction between grid-connected mini-grids and distribution systems (and the term “grid-connected mini-grid” is used to refer to both in the description below). At the larger end of the scale, distribution systems may be closely integrated into the main grid system, and the distinction between electrification through grid extension and through grid-connected distribution system expansion is one of ownership and management rather than technology. |
Internactions wiht other NAE Categories:
|
Delivery Model
|
The national grid system may be publically or privately owned or combine both in a public-private partnership. Common public-private models for grid systems include:
(Where individual distribution areas are separately owned, eg by municipalities or regional bodies, these may be regarded as grid-connected distribution systems and are discussed under that category). | |
|
Legual Basis
|
Grid systems almost always act as monopoly concessions (because of the need to balance demand and supply across the system in real-time, and the substantial investment required to establish and maintain the infrastructure). As a result, the right to transmit and sell electricity is often reserved to the national grid utility or company (at least within the area reached by the grid system). | |
|
Price/Tariff Regulation
|
In line with the nature of the national grid as a single coherent system, uniform tariffs are almost invariably charged across the system (though often with different tariffs for different classes of user and levels of usage, or in some cases time-of-use pricing). Electricity prices are a highly political issue in almost every country, and therefore there is almost always some oversight of these tariffs. Without explicit regulation there is a risk of political pressure leading to tariffs which fail to cover costs, and hence system deterioration. | |
|
Finance
|
Almost all national grid systems (including those in developed countries) are constructed using public funding, drawing on government funds sometimes supplemented by concessionary loans and grants from international agencies. Where the grid system is (wholly or partially) privately owned (often as the result of a privatisation process), private investment in infrastructure may be leveraged by subsidies (egfor connection charges). User charges are the other main source of grid system funding, and uniform tariffs mean that some element of cross-subsidy is inherent in grid-based electricity provision, with users who are more expensive to supply being subsidized by those who can be supplied more cheaply. | |
|
Non-Financial Interventions
|
National energy planning is key to establishing the economically optimum extent of the grid. Institutional restructuring, regulatory reform and policy and target setting may all be beneficial in creating the institutional and policy basis for grid extension. Capacity building or technical assistance may be needed where the key actors involved in grid extension lack capacity. Technology development/adoption and adoption of appropriate technical standards can enable grid extension at lower cost (as shown in the NAE Case Study:Tunisia where adoption of standards allowing MALT (Mise A La Terre) distribution lowered costs), while demand promotion may be needed to increase revenues and make it economically sustainable. |
Advantages and Disadvantages (Including Level of Electricity Provided)
|
Grid extension (combined with construction of additional generation capacity) is particularly appropriate for densely populated areas with higher demand levels, close to the existing grid system. Grid systems provide the ability to build large, efficient generating plants in optimum locations, and make use of economies of scale. These economies may, however, be overwhelmed by the costs of the transmission and distribution infrastructure needed for smaller, more remote communities where mini-grid and off-grid technologies may provide better solutions. Significant extension of the grid also calls for a series of major infrastructure projects, requiring planning, procurement and project management capabilities and is therefore often a lengthy exercise, meaning that other solutions, even if more expensive, may merit consideration as a means to achieve electrification more quickly. Grid systems are usually designed to provide a high level of electricity, suitable to serve all household, commercial, industrial and community requirements (Tier 51). However, where generation is inadequate (or liable to interruption); or transmission and distribution systems are insufficiently robust or poorly maintained; reliability and quality of supply may deteriorate. Thus while users have a physical connection to the grid, they may not in fact have reliable access to electricity (bringing the supply Tier 3 or lower). It is therefore important to couple grid extension with development of additional generation capacity to support the resulting additional demand. |
Further Informaiton and Guidance
|
Relevante Case Studies:
- Rwanda, Sector-Wide Approach to Planning
- South Africa, Integrated National Electrification
- Tunisia, Low Cost Distribution Technology
Isolated Mini-Grids
|
Definition: |
A system for generation and distribution of electricity to multiple users which is not connected to the main grid system. |
Internactions wiht other NAE Categories:
|
Delivery Model
|
The national grid system may be publically or privately owned or combine both in a public-private partnership. Common public-private models for grid systems include:
(Where individual distribution areas are separately owned, eg by municipalities or regional bodies, these may be regarded as grid-connected distribution systems and are discussed under that category). | |
|
Legual Basis
|
Grid systems almost always act as monopoly concessions (because of the need to balance demand and supply across the system in real-time, and the substantial investment required to establish and maintain the infrastructure). As a result, the right to transmit and sell electricity is often reserved to the national grid utility or company (at least within the area reached by the grid system). | |
|
Price/Tariff Regulation
|
In line with the nature of the national grid as a single coherent system, uniform tariffs are almost invariably charged across the system (though often with different tariffs for different classes of user and levels of usage, or in some cases time-of-use pricing). Electricity prices are a highly political issue in almost every country, and therefore there is almost always some oversight of these tariffs. Without explicit regulation there is a risk of political pressure leading to tariffs which fail to cover costs, and hence system deterioration. | |
|
Finance
|
Almost all national grid systems (including those in developed countries) are constructed using public funding, drawing on government funds sometimes supplemented by concessionary loans and grants from international agencies. Where the grid system is (wholly or partially) privately owned (often as the result of a privatisation process), private investment in infrastructure may be leveraged by subsidies (egfor connection charges). User charges are the other main source of grid system funding, and uniform tariffs mean that some element of cross-subsidy is inherent in grid-based electricity provision, with users who are more expensive to supply being subsidized by those who can be supplied more cheaply. | |
|
Non-Financial Interventions
|
National energy planning is key to establishing the economically optimum extent of the grid. Institutional restructuring, regulatory reform and policy and target setting may all be beneficial in creating the institutional and policy basis for grid extension. Capacity building or technical assistance may be needed where the key actors involved in grid extension lack capacity. Technology development/adoption and adoption of appropriate technical standards can enable grid extension at lower cost (as shown in the NAE Case Study:Tunisia where adoption of standards allowing MALT (Mise A La Terre) distribution lowered costs), while demand promotion may be needed to increase revenues and make it economically sustainable. |
Advantages and Disadvantages (Including Level of Electricity Provided)
|
Grid extension (combined with construction of additional generation capacity) is particularly appropriate for densely populated areas with higher demand levels, close to the existing grid system. Grid systems provide the ability to build large, efficient generating plants in optimum locations, and make use of economies of scale. These economies may, however, be overwhelmed by the costs of the transmission and distribution infrastructure needed for smaller, more remote communities where mini-grid and off-grid technologies may provide better solutions. Significant extension of the grid also calls for a series of major infrastructure projects, requiring planning, procurement and project management capabilities and is therefore often a lengthy exercise, meaning that other solutions, even if more expensive, may merit consideration as a means to achieve electrification more quickly. Grid systems are usually designed to provide a high level of electricity, suitable to serve all household, commercial, industrial and community requirements (Tier 51). However, where generation is inadequate (or liable to interruption); or transmission and distribution systems are insufficiently robust or poorly maintained; reliability and quality of supply may deteriorate. Thus while users have a physical connection to the grid, they may not in fact have reliable access to electricity (bringing the supply Tier 3 or lower). It is therefore important to couple grid extension with development of additional generation capacity to support the resulting additional demand. |
Further Informaiton and Guidance
|
Relevante Case Studies:
- Rwanda, Sector-Wide Approach to Planning
- South Africa, Integrated National Electrification
- Tunisia, Low Cost Distribution Technology
Standalone Systems
|
Definition: |
A system for generating and supplying electricity to a single user (separate from any distribution system). |
Internactions wiht other NAE Categories:
|
Delivery Model
|
The national grid system may be publically or privately owned or combine both in a public-private partnership. Common public-private models for grid systems include:
(Where individual distribution areas are separately owned, eg by municipalities or regional bodies, these may be regarded as grid-connected distribution systems and are discussed under that category). | |
|
Legual Basis
|
Grid systems almost always act as monopoly concessions (because of the need to balance demand and supply across the system in real-time, and the substantial investment required to establish and maintain the infrastructure). As a result, the right to transmit and sell electricity is often reserved to the national grid utility or company (at least within the area reached by the grid system). | |
|
Price/Tariff Regulation
|
In line with the nature of the national grid as a single coherent system, uniform tariffs are almost invariably charged across the system (though often with different tariffs for different classes of user and levels of usage, or in some cases time-of-use pricing). Electricity prices are a highly political issue in almost every country, and therefore there is almost always some oversight of these tariffs. Without explicit regulation there is a risk of political pressure leading to tariffs which fail to cover costs, and hence system deterioration. | |
|
Finance
|
Almost all national grid systems (including those in developed countries) are constructed using public funding, drawing on government funds sometimes supplemented by concessionary loans and grants from international agencies. Where the grid system is (wholly or partially) privately owned (often as the result of a privatisation process), private investment in infrastructure may be leveraged by subsidies (egfor connection charges). User charges are the other main source of grid system funding, and uniform tariffs mean that some element of cross-subsidy is inherent in grid-based electricity provision, with users who are more expensive to supply being subsidized by those who can be supplied more cheaply. | |
|
Non-Financial Interventions
|
National energy planning is key to establishing the economically optimum extent of the grid. Institutional restructuring, regulatory reform and policy and target setting may all be beneficial in creating the institutional and policy basis for grid extension. Capacity building or technical assistance may be needed where the key actors involved in grid extension lack capacity. Technology development/adoption and adoption of appropriate technical standards can enable grid extension at lower cost (as shown in the NAE Case Study:Tunisia where adoption of standards allowing MALT (Mise A La Terre) distribution lowered costs), while demand promotion may be needed to increase revenues and make it economically sustainable. |
Advantages and Disadvantages (Including Level of Electricity Provided)
|
Grid extension (combined with construction of additional generation capacity) is particularly appropriate for densely populated areas with higher demand levels, close to the existing grid system. Grid systems provide the ability to build large, efficient generating plants in optimum locations, and make use of economies of scale. These economies may, however, be overwhelmed by the costs of the transmission and distribution infrastructure needed for smaller, more remote communities where mini-grid and off-grid technologies may provide better solutions. Significant extension of the grid also calls for a series of major infrastructure projects, requiring planning, procurement and project management capabilities and is therefore often a lengthy exercise, meaning that other solutions, even if more expensive, may merit consideration as a means to achieve electrification more quickly. Grid systems are usually designed to provide a high level of electricity, suitable to serve all household, commercial, industrial and community requirements (Tier 51). However, where generation is inadequate (or liable to interruption); or transmission and distribution systems are insufficiently robust or poorly maintained; reliability and quality of supply may deteriorate. Thus while users have a physical connection to the grid, they may not in fact have reliable access to electricity (bringing the supply Tier 3 or lower). It is therefore important to couple grid extension with development of additional generation capacity to support the resulting additional demand. |
Further Informaiton and Guidance
|
Relevante Case Studies:
- Rwanda, Sector-Wide Approach to Planning
- South Africa, Integrated National Electrification
- Tunisia, Low Cost Distribution Technology
