Backup Power, Renewable Diesel and Data Centers

Technical information about standby generators, renewable diesel and responsible fuel management

Communities are asking important questions about the growth of data centers and their effects on electricity demand, water use, utility costs, noise, land use, emissions, tax policy, transparency and trust. Those conversations involve many stakeholders, including utilities, developers, regulators, elected officials, environmental organizations and local communities.

ESI Total Fuel Management’s expertise is more specific. For decades, ESI has designed, manufactured, installed, serviced and supported mission critical fuel systems that keep critical facilities operating when commercial power is unavailable. Our role is to help customers maintain safe, reliable backup power while supporting responsible fuel management and environmental stewardship.

Our goal is not to persuade readers toward a particular conclusion about data center development, but to provide technically accurate, transparent information that helps customers, communities and policymakers better understand the role of backup fuel systems.

At-a-Glance

  • Standby generators provide emergency power during utility outages and are routinely operated for testing and maintenance.
  • Generator operation is governed by federal, state and site specific regulations.
  • Diesel generators produce nitrogen oxides (NOx), particulate matter and other regulated emissions.
  • Renewable diesel (HVO) can reduce lifecycle greenhouse gas emissions compared with conventional petroleum diesel.
  • Lifecycle greenhouse gas reductions are different from local air quality impacts.
  • Renewable diesel meeting ASTM D975 may be suitable for existing diesel infrastructure when supported by engineering review, manufacturer guidance and operational validation.
  • Mission-critical facilities must balance environmental objectives with operational reliability.
  • Fuel quality, storage, maintenance and emergency availability are just as important as fuel selection itself.

Our Approach

ESI believes technical discussions should be grounded in engineering, publicly available information and transparent communication. When information falls outside our expertise, we will say so. When scientific or regulatory topics are evolving, we will acknowledge that uncertainty. Our recommendations are based on engineering practice, operational experience and verified technical information—not marketing claims.

Backup generators exist to provide reliable electrical power when normal utility service is unavailable. For data centers, hospitals, emergency communications facilities and other critical infrastructure, standby generators protect operations during power interruptions. They are also operated during scheduled testing and maintenance to verify emergency readiness.

These systems are not designed to operate continuously. Actual operating hours vary depending on:

  • Utility reliability
  • Emergency events
  • Scheduled testing
  • Maintenance requirements
  • Site specific permits

Federal and Virginia regulations distinguish emergency operation from testing and other nonemergency activities, and facilities are generally required to maintain operating records consistent with applicable permit requirements.

This context is important when discussing emissions. Meaningful evaluations should consider actual operating hours, engine technology, installed emissions controls, operating conditions and site specific factors rather than assuming generators operate continuously throughout the year.

Intermittent operation does not eliminate community concerns. Local impacts depend on numerous engineering and operational variables, including the engine, fuel, emissions control equipment, maintenance practices, facility design and proximity to surrounding communities.

Hydrotreated Vegetable Oil (HVO), commonly called renewable diesel, is a hydrocarbon fuel produced from renewable feedstocks such as:

  • Used cooking oil
  • Animal fats
  • Vegetable oils
  • Other renewable organic materials

Unlike conventional biodiesel, renewable diesel is refined into a hydrocarbon fuel that is chemically similar to petroleum diesel. Renewable diesel meeting ASTM D975 may be used in many existing diesel systems. However, “drop-in fuel” does not mean implementation requires no engineering review. Before adopting renewable diesel, operators should evaluate:

  • Fuel specifications
  • Equipment manufacturer recommendations
  • Storage compatibility
  • Fuel quality
  • Emergency supply availability
  • Fuel testing requirements
  • Documentation
  • Operational readiness

Every facility should validate these factors before transitioning fuels.

Renewable diesel may:

  • Reduce lifecycle greenhouse gas emissions compared with petroleum diesel.
  • Support organizational greenhouse gas reduction strategies.
  • Operate within existing diesel infrastructure when properly specified and validated.
  • Extend the usefulness of existing backup power assets while alternative technologies continue to develop.
  • Help organizations pursue sustainability objectives without replacing installed backup power systems.

Renewable diesel does not:

  • Eliminate generator emissions.
  • Produce identical air quality results under every operating condition.
  • Replace emissions control equipment.
  • Replace permitting requirements.
  • Replace emissions monitoring or reporting.
  • Resolve broader issues involving electricity demand, water use, land use, zoning, tax policy or community planning.
  • Ensure emergency reliability without proper fuel management and lifecycle support.

Renewable diesel should be viewed as one component of a broader operational and environmental strategy—not as a complete solution.

One of the most common misunderstandings surrounding renewable diesel involves the difference between lifecycle greenhouse gas emissions and direct exhaust emissions.

When ESI discusses lower lifecycle greenhouse gas emissions, we are referring to emissions associated with the fuel’s entire lifecycle, which may include:

  • Feedstock production
  • Transportation
  • Fuel refining
  • Distribution
  • Fuel use

Lifecycle assessments vary depending on feedstock source, production pathway, transportation distance and analytical methodology. These measurements are different from emissions measured directly at a generator exhaust stack. Local air quality, by contrast, depends on additional variables, including engine technology, emissions control equipment, maintenance, operating load and site specific conditions.

For these reasons, ESI avoids broad statements suggesting renewable diesel “reduces emissions” without explaining which measurement is being discussed. We view renewable diesel as a lifecycle greenhouse gas reduction tool—not a substitute for site specific air quality analysis.

Although renewable diesel production continues to grow, adoption within stationary backup power remains limited. Several factors contribute to this:

  • Higher cost than petroleum diesel in many markets.
  • Uneven supply across North America.
  • Limited emergency supply infrastructure in some regions.
  • Transportation costs, particularly along the East Coast.
  • Market incentives that do not consistently benefit stationary backup power users.
  • Broader adoption will require continued collaboration among fuel producers, distributors, equipment manufacturers, infrastructure operators, policymakers and end users.

Responsible Adoption Requires More Than Changing Fuel

For mission-critical facilities, fuel selection is only one part of operational readiness. Changing fuel affects an entire operating system—sourcing, quality, storage, testing, filtration and conditioning, transfer equipment, monitoring, maintenance, emergency replenishment, documentation and regulatory compliance—all of which must work together under both routine and emergency conditions.

At ESI, responsible fuel management means ensuring renewable diesel can be sourced, tested, stored, monitored, maintained and delivered with the same reliability customers expect from conventional diesel.

Decisions Should Be Based on Measured Information

Engineering decisions are strongest when supported by measured information rather than assumptions. Understanding actual:

  • Generator runtime
  • Fuel consumption
  • Fuel quality
  • Operating conditions
  • Maintenance history

provides a stronger basis for environmental reporting, operational planning and engineering decisions than generalized estimates—supporting better operational, regulatory and sustainability outcomes.

How ESI Supports Customers

ESI supports customers through an integrated lifecycle approach that may include:

  • Fuel quality management
  • Fuel testing and sampling
  • Engineered fuel management equipment
  • Fuel filtration and conditioning
  • Monitoring technologies
  • Emergency fuel planning
  • Environmental compliance support
  • Operational validation
  • Long term maintenance and service

Our objective is straightforward: support measurable environmental progress without compromising operational resiliency.

Questions Communities and Customers Can Ask

Thoughtful questions help create more productive conversations.

  • How often do standby generators operate?
  • What activities require generator operation?
  • What permits govern generator use?
  • Is renewable diesel being used?
  • How has fuel compatibility been evaluated?
  • How is fuel quality maintained during long-term storage?
  • How is emergency fuel availability ensured?
  • What methodology supports lifecycle greenhouse gas claims?
  • What emissions control equipment is installed?
  • How are local air quality impacts evaluated?
  • How is operational data measured and documented?

Our Commercial Role

ESI provides conventional diesel and renewable diesel, manufactures and services fuel management equipment, and advises customers on mission critical fuel systems. As renewable diesel adoption expands, ESI may benefit commercially. That makes transparency especially important.

We believe customers should understand not only the potential benefits of renewable diesel, but also its limitations, implementation requirements and operational considerations. Our responsibility is to provide technically grounded recommendations that prioritize safety, reliability and operational readiness.

Independent Resources

We encourage readers to review information from government agencies and independent technical organizations in addition to the information presented here.

Continue the Conversation

If you have questions about standby generators, renewable diesel, fuel quality or mission-critical fuel systems, we welcome the opportunity to discuss them. If your question involves another aspect of data center development, we will do our best to point you to an appropriate public resource—and to give you technically accurate information grounded in engineering, transparency and operational experience.

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