Project – The Application of Solar Energy Systems in Improving Electricity Reliability in Residential Buildings: A Case Study of Selected Communities in Nasarawa State.

CHAPTER ONE

THE APPLICATION OF SOLAR ENERGY SYSTEMS IN IMPROVING ELECTRICITY RELIABILITY IN RESIDENTIAL BUILDINGS: A CASE STUDY OF SELECTED COMMUNITIES IN NASARAWA STATE

1.1 Background to the Study

Electricity is an essential requirement for comfortable living, household productivity and socioeconomic development. In residential buildings, electricity is needed for lighting, refrigeration, cooking-related appliances, water pumping, communication devices, entertainment, security systems and other domestic activities. The availability of a reliable electricity supply also supports education, healthcare at household level, small-scale economic activities and the general wellbeing of residents. However, access to electricity should not be measured only by whether a building is connected to the national grid; the consistency, quality, affordability and duration of electricity supply are equally important. A residential building may have a grid connection but still experience frequent interruptions, low voltage and unpredictable power availability. The United Nations Sustainable Development Goal 7 recognises the importance of ensuring access to affordable, reliable, sustainable and modern energy for all, thereby placing electricity reliability at the centre of sustainable development (International Energy Agency [IEA], International Renewable Energy Agency [IRENA], United Nations Statistics Division [UNSD], World Bank, & World Health Organization [WHO], 2023). In Nigeria, the challenge of unreliable electricity has encouraged many households to seek alternative sources of power to supplement public electricity supply. Oseni (2017), in a study of Nigerian households, established that self-generation is widely used to reduce the negative effects of unreliable electricity services. This situation makes the search for dependable and sustainable electricity alternatives particularly important for residential buildings.

Nigeria’s electricity supply system has continued to face challenges associated with generation capacity, transmission limitations, distribution infrastructure, maintenance difficulties and increasing electricity demand. These challenges affect the ability of electricity consumers to receive consistent and adequate power supply. Even households connected to the national grid may experience frequent outages and interruptions that affect domestic activities and increase dependence on alternative energy sources. The World Bank (2023) observed that households and businesses in Nigeria have experienced unreliable and insufficient electricity supply, with many relying on petrol and diesel generators to fill the gap. Oseni (2017) also demonstrated that households engage in self-generation because unreliable public electricity provision imposes economic and welfare costs on consumers. Such dependence on generators creates additional household expenditure through fuel purchases, servicing and repairs, while also contributing to noise and environmental pollution. The National Policy on Renewable Energy and Energy Efficiency recognises renewable energy as an important means of diversifying electricity supply, improving energy access and strengthening the reliability of electricity services in Nigeria (Federal Ministry of Power, 2015). Consequently, alternative energy technologies, particularly solar energy systems, have become increasingly relevant to discussions on improving electricity reliability in Nigerian residential buildings.

Solar energy is a renewable source of energy derived from sunlight and converted into usable electricity through technologies such as photovoltaic panels. A typical residential solar photovoltaic system consists of solar panels, a charge controller, an inverter, batteries where storage is required, mounting structures, protective devices and associated electrical connections. Solar panels convert sunlight into direct-current electricity, while an inverter converts the electricity into alternating current suitable for most household appliances. Battery storage allows electricity generated during periods of sunshine to be stored for use at night or during periods of inadequate sunlight. Solar systems may be installed as standalone systems, grid-connected systems or hybrid systems that combine solar panels, battery storage and the national grid or other backup sources. Their application in residential buildings depends on household electricity demand, available roof or installation space, system capacity, sunlight availability and financial resources. The International Energy Agency et al. (2023) identify decentralised renewable energy technologies, including solar home systems, as important options for expanding access to modern electricity services. Similarly, the Federal Ministry of Power (2015) recognises the potential of solar photovoltaic technology for household applications and for supplying electricity to communities that are not adequately served by conventional grid infrastructure.

The application of solar energy systems can improve electricity reliability in residential buildings by providing an alternative or supplementary source of electricity when public power supply is unavailable. In a grid-connected building, a properly designed solar-battery system can supply selected household appliances during grid outages, thereby reducing dependence on generators and improving the continuity of domestic electricity services. In buildings with standalone solar installations, the system can provide electricity independently of the national grid, subject to its installed capacity and the availability of sunlight and stored energy. The effectiveness of a solar system depends on appropriate system sizing, the quality of its components, battery capacity, energy consumption patterns and proper installation. A study by Owebor et al. (2025) on solar energy and electricity access in rural households in Isoko South, Nigeria, found that households experienced electricity access challenges and demonstrated willingness to adopt cleaner and more reliable energy solutions. Similarly, the World Bank (2021), in its assessment of distributed solar photovoltaic systems in urban Nigeria, examined the viability of rooftop solar systems as an option for improving household electricity services. These studies indicate that solar energy can contribute to improved electricity reliability, although its actual benefits depend on the technical and economic suitability of the system for individual households.

Another important consideration is the economic and environmental implication of adopting solar energy systems in residential buildings. Many households in Nigeria depend on petrol or diesel generators to provide electricity during grid interruptions, but generator use involves recurring expenditure on fuel, maintenance and repairs. Solar energy systems may require substantial initial investment, particularly where households need high-capacity solar panels, inverters and battery storage. However, once properly installed, solar systems can reduce dependence on fuel-powered generators and lower recurring energy expenditure, depending on the household’s electricity demand, system design and maintenance requirements. A techno-economic study by Olatomiwa et al. (2021) on residential rooftop solar-battery systems in Lagos, Nigeria, found that solar-battery systems could provide an economically attractive alternative for households that rely on backup generators to obtain more reliable electricity services. The study also reported potential reductions in household air emissions following the adoption of solar-battery systems. In addition, Ugulu (2016), in research on decentralised photovoltaic adoption in urban Nigeria, identified frequent power outages and the desire to reduce generator-related costs among the factors motivating households to adopt solar photovoltaic systems. These findings suggest that the application of solar energy may offer both reliability and environmental benefits, although affordability and access to finance remain important considerations.

Despite the potential benefits of solar energy, the successful application of solar systems in residential buildings may be affected by several technical, financial and institutional challenges. The initial cost of purchasing and installing solar panels, inverters and batteries may discourage households with limited financial resources. Other challenges include inadequate technical knowledge, poor-quality components, improper system installation, battery degradation, insufficient maintenance and limited access to competent solar technicians. The capacity of a solar installation may also be insufficient where the system is poorly designed or where household electricity consumption exceeds the amount of energy the system can generate and store. Anugwom, Anugwom and Eya (2020), in their study of solar home system adoption among urban households in southeastern Nigeria, identified limited awareness, concerns about system reliability and restrictions in the amount of electricity generated as factors affecting adoption. Ugulu (2016) similarly identified high capital costs, lack of finance and low awareness as major barriers to decentralised photovoltaic adoption in urban Nigeria. These challenges show that the availability of sunlight alone does not guarantee reliable electricity from solar installations. Effective application requires appropriate system selection, professional installation, proper maintenance, user awareness and adequate financial planning.

Nasarawa State provides a relevant geographical setting for examining the application of solar energy systems in residential buildings because electricity reliability is important to households across its urban, semi-urban and rural communities. Residential areas in the state include households with different income levels, building structures, appliance requirements and levels of access to electricity infrastructure. Some communities depend largely on public electricity supply, while others may supplement grid electricity with generators, rechargeable devices and other alternative sources. The suitability of solar energy systems in these communities may differ according to household energy demand, installation costs, access to solar equipment, technical support and the physical characteristics of residential buildings. The Federal Ministry of Power (2015) identifies solar energy as a renewable resource that can support electricity provision across different geographical locations in Nigeria, while the World Bank (2023) emphasises the importance of distributed renewable energy solutions in addressing electricity access and supply challenges. Therefore, investigating selected communities in Nasarawa State can provide useful evidence about household awareness, adoption, utilisation and experiences with solar energy systems. It can also help establish whether the technology is adequately meeting residential electricity needs and what factors limit its contribution to electricity reliability.

Although solar energy has gained attention as an alternative source of electricity in Nigeria, its actual contribution to reliable electricity supply in residential buildings requires further examination at community level. The mere installation of solar panels does not automatically guarantee continuous electricity because system performance depends on installed capacity, battery storage, household consumption, maintenance and the availability of technical support. Some households may use solar energy only for lighting and charging small electronic devices, while others may operate larger systems capable of powering refrigeration, fans, televisions and other appliances. There may also be differences between households that use solar energy as their primary electricity source and those that use it as a backup to grid electricity. Existing Nigerian studies, including Ugulu (2016), Anugwom et al. (2020) and Olatomiwa et al. (2021), provide useful evidence on solar adoption, household energy use and the economic performance of residential solar systems. However, the experiences of households in selected communities in Nasarawa State require specific investigation. It is therefore necessary to examine the application of solar energy systems, assess their contribution to electricity reliability, identify the challenges affecting their use and determine measures for improving their effectiveness in residential buildings. This study is consequently designed to investigate the application of solar energy systems in improving electricity reliability in residential buildings in selected communities in Nasarawa State.

1.2 Statement of the Problem

The provision of reliable electricity remains a major concern for many households in Nigeria, particularly where public electricity supply is characterised by frequent interruptions, inadequate supply hours and inconsistent voltage. Residential buildings depend on electricity for essential domestic activities, including lighting, food preservation, water supply, communication, security and the operation of household appliances. When electricity supply is interrupted for extended periods, residents may experience inconvenience, disruption of domestic activities, additional expenses and reduced comfort. Although connection to the national grid provides access to public electricity infrastructure, it does not necessarily guarantee a continuous or dependable supply. The World Bank (2023) observed that Nigerian households with access to the national grid still face unreliable and insufficient electricity supply, while Oseni (2017) established that households resort to self-generation to reduce the effects of unreliable public electricity services. This situation creates a need for alternative electricity solutions capable of supporting residential energy requirements and reducing the effects of frequent power interruptions. Solar energy systems offer one possible solution, but their actual contribution to electricity reliability in residential buildings in selected communities in Nasarawa State requires investigation.

A further problem concerns the extent to which households in selected communities in Nasarawa State have adopted and effectively utilised solar energy systems. Although solar photovoltaic technology has become increasingly recognised as an alternative source of electricity, households may differ in their level of awareness, willingness to adopt the technology, financial capacity and understanding of the system requirements. Some residents may have installed solar panels but use them only for limited purposes such as lighting and charging mobile devices, while others may have systems capable of supporting several household appliances. In addition, some households may use solar energy as their primary electricity source, whereas others depend on it only when grid electricity is unavailable. Anugwom et al. (2020) found that awareness, perceived system reliability and the limited amount of electricity generated influenced the adoption of solar home systems among urban households in southeastern Nigeria. Ugulu (2016) also identified low awareness, high initial costs and limited access to finance as significant barriers to residential photovoltaic adoption in urban Nigeria. These findings raise questions about the level of solar energy adoption, the types of systems being used and the extent to which residents in the selected communities understand and utilise the technology to improve their electricity supply.

Another major concern is whether the solar energy systems available in residential buildings are technically adequate to provide the level of electricity reliability expected by households. The performance of a solar installation depends on several factors, including the capacity and quality of solar panels, inverter ratings, battery storage, household energy consumption, installation standards and regular maintenance. Where a system is undersized, poorly installed or inadequately maintained, it may fail to meet household electricity demand, particularly at night or during periods of reduced solar generation. Battery deterioration and faulty system components may also reduce the amount of electricity available to residents. Udeani, Jaramillo and Williams (2021), in their assessment of residential rooftop solar-battery systems in grid-connected households in Lagos, demonstrated the potential of solar-battery systems to improve electricity service reliability and reduce dependence on backup generators. However, the benefits of such systems depend on their technical and economic suitability for the households concerned. Therefore, it is necessary to examine whether the solar energy systems used in selected communities in Nasarawa State provide adequate electricity, reduce power interruptions and meet the essential energy needs of residential buildings.

Furthermore, the application of solar energy systems may be constrained by financial, technical and maintenance-related challenges. The high initial cost of acquiring solar panels, inverters, batteries and installation services may prevent many households from adopting systems with sufficient capacity to meet their electricity requirements. Other difficulties may include the high cost of replacing batteries, inadequate access to qualified technicians, poor-quality components, limited maintenance services and insufficient knowledge of appropriate system operation. Owebor et al. (2025), in their study of solar energy and rural household electricity access in Isoko South, Nigeria, identified the high upfront cost of solar solutions as an important consideration in household adoption. Ugulu (2016) similarly found that financial constraints and low awareness affected the adoption of decentralised photovoltaic systems in urban Nigeria. Although these studies provide useful evidence on solar energy adoption and household electricity needs, there is a need to establish how these challenges affect the application and performance of solar energy systems in selected communities in Nasarawa State. The problem, therefore, is not only whether solar energy systems are available in residential buildings, but whether households can afford, install, maintain and effectively utilise them to achieve improved electricity reliability.

1.3 Aim and Objectives of the Study

The aim of this study is to examine the application of solar energy systems in improving electricity reliability in residential buildings in selected communities in Nasarawa State.

The specific objectives are to:

1. Examine the level of adoption and types of solar energy systems used in residential buildings in selected communities in Nasarawa State.

2. Assess the contribution of solar energy systems to improving electricity reliability in residential buildings in the selected communities.

3. Examine the technical, financial and maintenance-related challenges affecting the effective application of solar energy systems in the selected communities.

4. Determine the measures that can enhance the effective application and performance of solar energy systems in improving residential electricity reliability in the selected communities.

1.4 Research Questions

The following research questions will guide the study:

1. What is the level of adoption and what types of solar energy systems are used in residential buildings in selected communities in Nasarawa State?

2. To what extent do solar energy systems contribute to improving electricity reliability in residential buildings in the selected communities?

3. What are the technical, financial and maintenance-related challenges affecting the effective application of solar energy systems in the selected communities?

4. What measures can enhance the effective application and performance of solar energy systems in improving residential electricity reliability in the selected communities?

1.5 Research Hypothesis

The following null hypothesis is formulated to guide the study:

H₀: The application of solar energy systems has no significant relationship with electricity reliability in residential buildings in selected communities in Nasarawa State.

1.6 Significance of the Study

This study is significant because it will provide information on how solar energy systems can contribute to improving electricity reliability in residential buildings. The findings will be useful to residents, homeowners, solar energy providers, government agencies, policymakers, electrical engineers, students and future researchers.

Residents and Homeowners: The study will help residents understand the potential benefits of solar energy systems as an alternative or supplementary source of electricity. It will provide information on the factors to consider when selecting solar systems, including household electricity demand, system capacity, battery storage, installation costs and maintenance requirements. The findings may also assist homeowners in making informed decisions about adopting solar energy to reduce their dependence on unreliable public electricity supply.

Solar Energy Companies and Service Providers: The findings will provide useful information to solar energy companies, installers and maintenance service providers on the needs and challenges of residential solar energy users. It may help them improve the quality of their products, installation procedures, after-sales services and maintenance support. The study may also provide insight into the types of solar systems that are more suitable for different residential electricity requirements.

Government and Policymakers: The study will provide information that may assist government institutions and policymakers in developing policies and programmes that encourage the adoption of renewable energy in residential buildings. The findings may support initiatives involving public awareness, access to affordable solar technology, technical training, quality standards and financial assistance for households.

Electrical Engineers and Technical Professionals: The study will help electrical engineers and other technical professionals appreciate the importance of proper system design, installation, maintenance and performance assessment. It may encourage the adoption of appropriate technical standards to ensure that residential solar systems are capable of meeting household electricity requirements safely and efficiently.

Environmental Sustainability: The study will provide useful information on the potential of solar energy systems to reduce household dependence on petrol and diesel generators. Greater use of solar energy may help reduce generator-related emissions, noise and environmental pollution, depending on the extent to which solar systems replace fuel-powered alternatives.

Students and Future Researchers: The study will serve as a reference material for students and researchers interested in renewable energy, electrical engineering, energy management, sustainable housing and electricity reliability. It may also provide a foundation for further studies on solar energy adoption, residential energy consumption and renewable energy development in Nigeria.

1.7 Scope of the Study

The study focuses on the application of solar energy systems in improving electricity reliability in residential buildings in selected communities in Nasarawa State, Nigeria. Its geographical scope is limited to the selected communities within the state.

The content scope covers the adoption and utilisation of solar energy systems in residential buildings, the types of solar systems installed, their contribution to electricity reliability and the challenges affecting their effective application. The study will consider solar photovoltaic panels, inverters, battery storage systems, charge controllers and other relevant system components.

The study will assess electricity reliability through indicators such as availability of electricity, reduction in power interruptions, duration of electricity supply, ability to power essential household appliances and residents’ satisfaction with electricity services. It will also examine technical, financial and maintenance-related challenges, as well as possible measures for improving the application of solar energy systems.

The respondents may include homeowners, tenants, household heads, residents using solar energy systems, solar installers and other individuals with relevant knowledge of residential electricity supply in the selected communities.

1.8 Limitations of the Study

The study may encounter certain limitations during data collection and analysis. One possible limitation is the difficulty of obtaining accurate information from some residents regarding the technical capacity, installation costs, battery condition and performance of their solar energy systems. Some respondents may not have detailed knowledge of the technical specifications of the systems installed in their buildings.

Another possible limitation is the unwillingness of some residents to disclose information concerning their household electricity expenditure, installation costs and maintenance expenses. This may affect the level of detail available for analysing the economic aspects of solar energy adoption.

Financial and time constraints may also limit the number of residential buildings and communities that can be covered during the research. Consequently, the study will concentrate on selected communities in Nasarawa State rather than every residential area in the state.

Despite these limitations, appropriate research procedures will be adopted to obtain relevant information from respondents. Efforts will also be made to ensure that the data collected are adequate for addressing the objectives of the study.

1.9 Operational Definition of Terms

Solar Energy: This refers to energy obtained from sunlight and converted into electricity or other useful forms of energy for residential and other applications.

Solar Energy System: This refers to an arrangement of solar panels, inverters, batteries, charge controllers and associated electrical components used to generate, store and supply electricity from solar energy.

Solar Photovoltaic System: This is a technology that converts sunlight directly into electrical energy through photovoltaic cells.

Residential Building: This refers to a building designed and used primarily for human habitation, including houses, flats, apartments and other domestic accommodation.

Electricity Reliability: This refers to the ability of an electricity supply system to provide consistent and dependable electricity with minimal interruptions and acceptable service quality.

Electricity Supply: This refers to the provision of electrical power to residential buildings for domestic activities and the operation of household appliances.

Solar Panel: This is a device containing photovoltaic cells that converts sunlight into direct-current electricity.

Inverter: This is an electrical device that converts direct-current electricity generated by solar panels or stored in batteries into alternating-current electricity suitable for household appliances.

Battery Storage: This refers to the storage of electricity generated by solar panels for use when sunlight is unavailable or insufficient.

Solar Energy Adoption: This refers to the decision and actual process of acquiring, installing and using solar energy systems to meet household electricity needs.

Power Interruption: This refers to an unexpected or scheduled break in electricity supply that prevents household appliances and electrical devices from operating.

Hybrid Solar System: This refers to a solar energy arrangement that combines solar panels and battery storage with another electricity source, such as the national grid or a generator.

1.10 Organisation of the Study

This research work is organised into five chapters.

Chapter One presents the general introduction to the study. It includes the background to the study, statement of the problem, aim and objectives, research questions, research hypothesis, significance of the study, scope of the study, limitations of the study and operational definition of terms.

Chapter Two reviews relevant literature on the application of solar energy systems and electricity reliability in residential buildings. It covers the conceptual review, theoretical framework, empirical review and research gaps.

Chapter Three presents the research methodology adopted for the study. It discusses the research design, area of the study, population, sample size, sampling techniques, sources of data, research instrument, validity and reliability of the instrument, methods of data collection and techniques of data analysis.

Chapter Four focuses on the presentation, analysis and interpretation of data collected from respondents. It also presents the findings in relation to the research questions and tests the formulated hypothesis.

Chapter Five presents the summary of findings, conclusion and recommendations based on the results of the study. It also provides suggestions for further research.

Project – The Application of Solar Energy Systems in Improving Electricity Reliability in Residential Buildings: A Case Study of Selected Communities in Nasarawa State.