Nigeria’s Energy Challenge: The Carbon Cost of Power Reliability

 

Nigerian commercial building with rooftop solar panels and a diesel backup generator, illustrating a hybrid energy system for reliable and lower-carbon business operations.

By Dr. Juliana Philip Ndalnamu

Research Tips with Dr. Juliana

Imagine a busy hotel in Lagos or a commercial office in Abuja. The lights are on, air conditioners are running, guests are checking in, and staff are processing payments. Then the grid supply fails. Within moments, a diesel generator started, allowing business to continue.

For many Nigerian organisations, this is a familiar part of daily operations. Reliable electricity supports productivity, customer service, food safety, comfort, and business continuity. When grid supply is interrupted, stopping operations may not be realistic.

Yet the cost of keeping the lights on extends beyond fuel bills, generator servicing, and equipment maintenance. There is also an environmental cost: the greenhouse gas emissions associated with the energy an organisation uses.

Understanding this carbon cost of power reliability does not mean blaming businesses for using generators. It means measuring energy use accurately so organisations can identify waste, make informed investment decisions, and reduce emissions without compromising essential services.

1. Why generator dependence persists in Nigeria

Nigeria has substantial installed electricity-generation capacity, but installed capacity is not the same as the electricity available and delivered at a given time. The Nigerian Electricity Regulatory Commission reported installed capacity of approximately 12,721 megawatts and average generation of about 4,191 megawatts in 2023. These historical figures illustrate the gap between installed capacity and actual generation; they are not current real-time statistics.

Power supply challenges affect organisations differently, depending on location, equipment, operating hours, and the need for continuous electricity. For energy-dependent businesses, an interruption can have immediate consequences:

• Hotels and restaurants: Outages can disrupt air conditioning, lighting, refrigeration, laundry, water pumping, and guest services.
• Offices and small businesses: interruptions may affect internet access, digital payments, communications, and service delivery.
• Healthcare and cold-chain facilities: dependable power is essential for equipment, storage, and safe operations.
• Manufacturing and processing: interruptions can cause downtime, production delays, and material losses.

Petrol and diesel generators therefore remain an important source of backup—and, for some organisations, routine—electricity. A realistic sustainability strategy must recognise that businesses need dependable power. The aim is to reduce unnecessary fuel consumption and emissions while maintaining the reliability their operations require.

2. The carbon cost of backup power

When petrol or diesel is burned in a generator, combustion releases carbon dioxide (CO₂). Smaller quantities of other greenhouse gases, including methane (CH₄) and nitrous oxide (N₂O), may also be emitted. Generator exhaust can contain air pollutants such as particulate matter, nitrogen oxides, and carbon monoxide, which affect local air quality. These pollutants are important health concerns, although they are not all greenhouse gases.

For carbon accounting, organisations should distinguish between emissions that occur directly on their premises and emissions associated with electricity or fuels supplied by others.

Understanding Scope 1, Scope 2, and Scope 3

• Scope 1 — direct emissions: emissions from sources owned or controlled by the organisation. Diesel or petrol burned in an on-site generator is generally Scope 1.
• Scope 2 — purchased electricity: indirect emissions associated with the generation of electricity purchased and consumed by the organisation. These emissions usually occur at the electricity-generation source.
• Scope 3 — other value-chain emissions: other indirect emissions in the organisation’s value chain. Examples may include emissions from extracting, refining, and transporting fuels before combustion, as well as applicable transmission and distribution losses for purchased electricity.

The precise treatment depends on the organisation’s reporting boundary and the accounting standard it follows. Scope 3 fuel- and energy-related activities cover emissions not already included in Scope 1 or Scope 2. Organisations should document their methods and avoid double-counting the same emissions across categories.

3. How organisations can measure energy-related emissions

A practical carbon inventory starts with two basic inputs: activity data and an appropriate emission factor.

Activity data measure the activity that causes emissions—for example, litres of diesel consumed or kilowatt-hours (kWh) of electricity purchased.

An emission factor converts a unit of activity into an estimated quantity of greenhouse gas emissions. The factors should match the fuel or energy source, unit, reporting boundary, and gases being counted as closely as possible.

Basic carbon-accounting formula

Emissions = Activity data × Emission factor

For example: litres of diesel consumed × a factor expressed in kg CO₂e per litre = estimated emissions in kg CO₂e.

Illustrative example: a diesel generator

Suppose a commercial facility records diesel consumption of 25,000 litres over 12 months. To calculate emissions, the organisation must select a suitable, documented emission factor for the diesel used and the accounting boundary adopted.

For illustration only, if the selected factor were 2.68 kg CO₂e per litre, the calculation would be:

25,000 litres × 2.68 kg CO₂e/litre = 67,000 kg CO₂e

Dividing by 1,000 gives 67 tonnes CO₂e.

Important: this factor is illustrative, not a verified Nigeria-specific factor or a universal value for all diesel generators. For formal reporting, use the most appropriate available factor from a credible source, record its publication year and units, and check whether it covers combustion emissions alone or includes upstream fuel-cycle emissions. Do not combine factors with different boundaries without adjusting the calculation.

What records should businesses keep?

• Petrol and diesel: purchase receipts, delivery records, fuel-store records, and generator logbooks showing fuel use and operating hours.
• Grid electricity: electricity bills and meter readings, preferably recorded in kWh rather than inferred only from payment amounts.
• Solar electricity: inverter or monitoring-system records showing electricity generated and, where available, electricity self-consumed or exported.
• Refrigerants: maintenance records showing refrigerant type and quantity added or removed during servicing, where available.

Consistent records make it easier to establish a baseline, compare periods, investigate unusual increases, and assess whether energy-saving measures are working.

4. What this means for Nigerian hotels and businesses

Energy use affects both operating costs and environmental performance. Heavy reliance on generators can increase expenditure on fuel, maintenance, and replacement parts, while fuel combustion adds to an organisation’s direct emissions. Tracking both cost and consumption helps managers see where operational changes may offer financial and environmental benefits.

Absolute emissions versus emissions intensity

Two indicators are particularly useful when assessing energy-related carbon performance:

• Absolute emissions: the total greenhouse gas emissions reported over a defined period, usually expressed in tonnes of carbon dioxide equivalent (tCO₂e) per year.
• Emissions intensity: emissions divided by a relevant measure of activity, such as occupied room-nights in a hotel, units produced in a factory, or floor area where that denominator is appropriate.

For a hotel, one possible indicator is:

Carbon intensity per occupied room-night = Hotel emissions (kg CO₂e) ÷ Occupied room-nights

These measures answer different questions. Absolute emissions show the overall emissions associated with the operation. Emissions intensity shows how emissions relate to the level of activity. A hotel’s total emissions may rise when occupancy increases, even if it becomes more efficient per occupied room-night. Conversely, a lower intensity does not necessarily mean total emissions have fallen.

For meaningful comparisons, hotels should define the emissions included, use consistent occupancy data, and apply the same calculation method across periods or properties. Intensity indicators support interpretation, but they do not replace reporting of absolute emissions.

5. Practical ways to reduce emissions without sacrificing reliability

There is no single solution suitable for every organisation. The right combination depends on the site’s load profile, operating hours, available capital, maintenance capacity, and need for uninterrupted supply. A staged approach can help businesses prioritise practical measures.

Stage 1: Measure energy use and manage demand

• Record generator fuel consumption, running hours, and grid electricity use consistently.
• Identify major energy loads, such as air conditioning, refrigeration, laundry, pumps, and water heating.
• Maintain generators according to manufacturer guidance and assess whether their capacity is suitable for the loads they serve.
• Where operationally possible, schedule flexible tasks for periods when grid supply or on-site solar generation is available.

Stage 2: Improve equipment and building efficiency

• Replace inefficient lighting with suitable LED fittings.
• Maintain air-conditioning and refrigeration systems, and select efficient equipment when replacements are due.
• Use appropriate temperature settings and controls, and reduce unwanted heat gain through shading, roof improvements, or other suitable building measures.
• Switch off equipment when it is not needed, while preserving safety, refrigeration, and essential service requirements.

Stage 3: Assess cleaner and hybrid energy options

• Assess solar photovoltaic systems for loads that can be served reliably by daytime generation.
• Consider battery storage where the load profile, system design, safety requirements, and cost justify it.
• Evaluate hybrid systems that coordinate grid electricity, solar generation, batteries, and generators.
• Compare options using realistic assumptions about capital cost, fuel price, maintenance, expected equipment life, and reliability requirements.

Solar panels and batteries do not automatically eliminate all emissions or guarantee uninterrupted electricity. Outcomes depend on system design, usage, equipment, and the source of any backup power. Organisations should measure performance after installation rather than assume projected savings have been achieved.

6. How carbon accounting supports better business decisions

Carbon accounting turns fuel and electricity records into information that managers can use. A well-documented energy inventory can help an organisation:

1. Identify emission hotspots: determine whether the main contributors are generator fuel, purchased electricity, vehicles, or other energy-related sources.
2. Prioritise improvements: direct attention towards measures likely to reduce avoidable energy use and operating costs.
3. Assess investments: compare the financial and emissions implications of efficiency upgrades, solar systems, batteries, and other options using transparent assumptions.
4. Track progress: compare fuel consumption, electricity use, absolute emissions, and relevant intensity indicators over time.
5. Improve reporting: provide clearer evidence for management decisions, sustainability disclosures, and requests from customers or business partners.

Good carbon accounting does not depend on complicated software at the outset. For many small organisations, a well-maintained spreadsheet, reliable utility records, documented emission factors, and a consistent method provide a useful starting point.

Conclusion: Reliability and sustainability must advance together

For Nigerian organisations, dependable electricity is essential. But the methods used to secure that reliability also have financial and environmental consequences. Measuring energy use makes those consequences more visible and gives businesses a stronger basis for deciding where to improve.

Reducing generator dependence may require investment and careful planning, but organisations can begin by recording what they consume, understanding the emissions associated with that consumption, and identifying practical opportunities to improve efficiency. The goal is not to compromise reliable service; it is to deliver that service with less waste and, where feasible, lower emissions.

Three actions business managers can take this month

1. Start an energy log: Record generator fuel use, operating hours, and grid electricity consumption.
2. Establish a baseline: calculate energy-related emissions using suitable, documented emission factors and clearly defined boundaries.
3. Identify three priority loads: Review the largest energy-consuming systems and assess realistic efficiency improvements.

Discussion question: How much does unreliable electricity supply and generator dependence affect your organisation’s energy costs and sustainability efforts? Share your experience in the comments.

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References and further reading

1. Department for Energy Security and Net Zero (DESNZ). (2024). Greenhouse gas reporting: Conversion factors 2024. UK Government. Read the guidance. These factors are a reference source; users should select factors appropriate to their activity and reporting boundary.
2. GHG Protocol. (2004). Corporate Accounting and Reporting Standard, Revised Edition. World Resources Institute and World Business Council for Sustainable Development. Read the standard.
3. GHG Protocol. Scope 3 Calculation Guidance: Fuel- and Energy-Related Activities. Read the guidance.
4. Intergovernmental Panel on Climate Change (IPCC). (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories. Read the guidelines.
5. Nigerian Electricity Regulatory Commission (NERC). (2024). Nigerian Electricity Market 2023: Market Competition Report. Read the report.

About the author: Dr Juliana Philip Ndalnamu writes about research methods, carbon accounting, sustainability, and practical approaches to evidence-informed decision-making.