Last updated: 22. september 2026
Diesel generators continue to provide backup power for critical infrastructure where power must remain available during an outage. At the same time, emissions requirements, fuel alternatives and new energy technologies are changing the conditions for how these systems are designed and operated.
This article looks at the future role of diesel generators, including regulatory requirements, HVO and other fuel options, maintenance and the potential use of natural gas and battery energy storage.
Key Takeaways
- Diesel generators continue to provide reliable backup power for critical infrastructure, particularly where extended runtime is required.
- Emissions requirements affect fuel choices, operation and the planning of new emergency power systems.
- HVO can provide an alternative to conventional diesel where the engine manufacturer has approved its use.
- Maintenance and system upgrades can extend the operational life of existing generator infrastructure.
- Natural gas and battery energy storage can be relevant alternatives or complementary technologies, depending on the application and local infrastructure.
Do diesel generators still have a role in emergency power?
Diesel generators continue to play an important role in emergency power where high power output, extended runtime and reliable backup are required. They can support critical loads for extended periods when sufficient fuel is available and the system is properly maintained.
Battery energy storage and renewable energy can cover some power requirements, but their suitability for emergency power depends on factors such as required runtime, load profile, available capacity and the design of the overall power system.
- Diesel generators can support extended operation when sufficient fuel is available.
- They are widely used in critical infrastructure such as hospitals, data centers and telecommunications.
- Internal combustion engine-based generator systems can provide high power output and long operating periods when designed and maintained for the required duty.
Discover: Diesel generator brochure
What regulatory requirements apply to diesel generators?
The regulatory requirements that apply to diesel generators depend on the location, engine type, installation and operating conditions. Relevant areas can include emissions and environmental requirements, fuel storage, maintenance and testing, installation requirements and local permits.
For emergency power systems, areas to consider include:
- Applicable emissions and environmental requirements
- Fuel storage practices and documentation
- Maintenance and testing procedures required to maintain system availability
- Requirements related to installation, operation and local permits
Existing generator infrastructure may also be suitable for upgrades or life extension. Where technically appropriate, replacing individual components, updating control systems or changing fuel can reduce the need to replace equipment that still meets the operational requirements.
Can HVO be used as an alternative to conventional diesel?
HVO can be used as an alternative to conventional diesel in engines that are approved for the fuel. It can reduce lifecycle greenhouse gas emissions compared with fossil diesel, depending on the feedstock and production process.
Hydrotreated vegetable oil (HVO) is a renewable fuel produced from feedstocks such as waste oils and animal fats. For compatible generator systems, it can provide an option for reducing emissions from existing infrastructure without replacing the generator itself.
Compatibility and applicable fuel specifications should be verified for the specific engine before changing fuel. Where the existing generator still meets operational requirements, HVO can therefore provide an option for reducing the environmental impact associated with fuel use.
Check out: (Case Study) EcoDataCenter - embracing sustainability with HVO100
How can maintenance extend the life of an emergency power system?
Regular maintenance can extend the operational life of an emergency power system by identifying developing issues before they lead to equipment failure. Routine inspections, fluid checks, load testing and condition monitoring also provide information that can support decisions about service, component replacement and system upgrades.
Condition monitoring and other predictive maintenance methods can provide additional information about equipment condition and help determine when components require service or replacement.
For existing installations, maintenance data can also support decisions about life extension. Components such as control systems can often be updated without replacing the complete generator installation.
Maintenance practices can also affect the environmental footprint of the system. This includes how consumables such as lubricating oil are managed and how service intervals are planned.
See what others have done: References
When can natural gas be used for emergency power?
Natural gas can be used for emergency power where a reliable gas supply is available and the solution meets the required response time, load profile, runtime and redundancy. Its suitability also depends on installation requirements, local regulations and site-specific conditions.
Where a reliable gas supply is available, gas generator sets may offer lower emissions of some pollutants compared with conventional diesel systems. The technical and economic case will depend on the installation and operating profile.
Factors to evaluate include:
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Fuel supply: Availability, capacity and reliability of the local gas infrastructure
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Installation: Space, connection requirements, permitting and site-specific conditions
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Operational requirements: Required response time, load profile, runtime and redundancy
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Regulatory requirements: Applicable emissions, safety and installation requirements
A feasibility assessment should cover the technical requirements, available infrastructure, regulatory conditions and expected operating profile before natural gas is selected for emergency power.
Read also: Secure critical operations - gas generator set
How can battery energy storage be combined with generator sets?
Battery Energy Storage Systems (BESS) can be combined with generator sets in hybrid configurations to cover different power requirements. Depending on the system design, battery storage can support shorter-duration loads or peak loads and reduce generator runtime in suitable operating scenarios.
Generator capacity can remain available for longer outages or higher loads. The appropriate configuration depends on factors such as load profile, required runtime, battery capacity and the operating requirements of the facility.
- Battery storage can support shorter-duration power requirements or peak loads.
- Generator runtime can be reduced in operating scenarios where battery capacity can cover part of the demand.
- Generator capacity can remain available for longer outages or higher loads.
Summary
Diesel generators continue to have a role in emergency power systems where reliability, high power output and extended runtime are required. How they are used will increasingly be influenced by emissions requirements, fuel options and developments in energy storage and other power technologies.
For existing installations, maintenance, control system upgrades, life extension and approved alternative fuels can provide ways to adapt the system without replacing equipment that still meets operational requirements.
The appropriate approach depends on the required load, runtime, local infrastructure, regulatory requirements and the condition of the existing system.
