Data Centers & Server Farms
Backup Energy for Data Centers — Diesel, Refueling and Maintenance With No Single Point of Failure
In a data center, power continuity is not a goal — it is a contractual commitment. Dolek Energy supplies the entire fuel envelope behind your backup generators: quality-assured diesel, scheduled and 24/7 emergency refueling, ongoing polishing and filtration, and tank cleaning — so when the grid goes down, your SLA stays up.
Years of experience · Nationwide coverage · 24/7 emergency response
[Hero image — row of backup diesel generators in a data-center power hall]
The Challenge: In an SLA, Fuel Is the Failure Point No One Is Watching
A data center is measured in nines. An availability target of 99.99% leaves roughly 52 minutes of downtime a year; 99.999% narrows that to about 5 minutes. Every second beyond that budget is an SLA breach against your customers — penalties, credits, and reputational damage that is hard to undo. To hold that target, a server farm is built in redundant layers: a UPS bridges the first instants, and diesel generators carry the load for the full length of the outage. Yet while the UPS, the PDUs and the cooling are monitored relentlessly, the link that holds the entire backup chain on its feet — the diesel sitting in the tank — is too often left off the monitoring screen.
That is an expensive blind spot. A generator is only potential; diesel is what turns it into power. And most real-world backup failures do not come from a fault in the engine, but from the fuel that feeds it: diesel that aged while it waited in the tank, water that condensed out of humidity and pooled at the bottom, sludge and microbial growth that clog the filters at the exact moment of start-up, or a tank that dropped too close to reserve precisely as the outage stretched on. In a critical system there is no second run — the UPS bridged the opening seconds, and now everything depends on the generator running for hours straight, clean and stable.
A data-center manager accountable for an SLA needs certainty at exactly this point. Not a promise that fuel will arrive "soon," but a fuel chain that is planned, monitored and maintained like every other critical component in the facility. That is precisely the certainty Dolek Energy is built to deliver.
Our Solution: A Complete Fuel Envelope for the Server Farm — From Supply to Filtration
Dolek Energy approaches a data center's backup generators as one complete system, not as a one-off diesel order. We take responsibility for the full energy chain — from the first drop that enters the tank to the filtration that returns it to spec — so that fuel stops being the unknown in your SLA equation.
Generator Diesel — Quality Assured for Long-Term Storage
Dedicated diesel supply for backup generators, meeting the relevant diesel standards and suited to long dwell time in the tank. Fuel in a backup system is not consumed quickly the way it is in a vehicle — it may sit for months, which makes both its starting quality and the ability to preserve it critical. We plan supply so fuel quality is held over time, with documentation on request.
Scheduled + 24/7 Emergency Refueling — So the Tank Never Drops Below Reserve
Routine refueling on a pre-coordinated plan, based on tank volume, consumption rate and the reserve defined for the facility — alongside a pre-defined emergency track available around the clock. In a prolonged outage, the generator shifts from standby to continuous duty and the diesel burn rate jumps. Our emergency desk is built for exactly that scenario: urgent refueling that arrives on time, so the tank does not run dry in the middle of an event.
Ongoing Fuel Polishing & Filtration — Keeping Diesel In-Spec Over Time
Diesel left standing in a tank degrades. Water condenses out of humidity, sludge and sediment settle, and microbes develop at the interface between fuel and water. Periodic polishing and filtration remove water, sludge and contaminants and return the diesel to spec — so at the moment of start-up the fuel delivered to the generator is clean, dry and reliable, and does not clog a filter at the critical second.
Tank Cleaning — Thorough Removal of Sludge and Sediment
When contamination builds beyond what ongoing filtration can handle, a thorough tank cleaning is needed: draining, removing sludge and sediment from the walls and bottom, and treating water and microbial growth. In a data center this is not merely routine maintenance — it is an action that directly protects the generator's ability to start.
Transformer Oil for Substations — IEC 60296
Large data centers hold substations and transformers inside their power layout. We also supply high-quality dielectric transformer oil meeting the IEC 60296 standard, with COA and SDS on request — so the facility's energy envelope stays under one provider, from generator to transformer.
A Scenario: Friday Evening, a Heatwave, and the Grid Drops for Two Hours
A server farm in central Israel. 21:40 on a Friday evening, in the middle of a heatwave, and the regional grid collapses. The UPS instantly catches the opening seconds, and three diesel generators ramp to full load within tens of seconds. So far — exactly as designed.
The difference between a facility that holds its SLA and one that breaches it shows up in the hour that follows. A generator running on diesel that has been polished regularly, from a tank that is cleaned and maintained, simply keeps working — an hour, two hours, as long as it takes. In a facility where the fuel was neglected, that same full load is precisely what pulls the sludge and water up from the bottom into the filters, and a generator that ran for years on short "test runs" chokes exactly when it is finally asked to work for real.
The difference is not luck, and it is not decided at the moment of the fault. It is settled months earlier — in whether anyone treated fuel as a critical component. Dolek Energy's clients walk into that Friday evening with a planned reserve, filtered diesel, and an emergency desk that knows exactly where to go and when. And when the heatwave stretches longer than expected and the reserve starts to fall, the emergency refueling is already on the way — before the gauge gets close to red.
Standards and Reliability — Because an SLA Is Built From Documentation, Not Promises
The diesel we supply for backup generators meets the relevant diesel standards, and the transformer oil for substations meets IEC 60296 — with documentation (COA/SDS) on request. We work to the strictest standards in the industry and accompany every supply and service with full transparency: what was delivered, when, and at what quality.
For a data-center manager, that documentation is not a formality — it is part of the evidence set that proves SLA and uptime compliance to customers and auditors. A documented fuel chain, with quality control, periodic filtration and preventive treatment, is exactly what turns "we have generators" into "our backup chain is ready and provable." That is the advantage of a complete envelope: the same provider that supplies the diesel is the one who documents it, filters it and keeps it in-spec.
Why Dolek for Data Centers — One Envelope, Zero Points of Failure
Full lifecycle under one provider
Diesel supply, scheduled and emergency refueling, polishing, filtration, tank cleaning and transformer oil. Instead of coordinating between a fuel supplier and a maintenance specialist and hoping they talk to each other, you have one energy partner accountable for the entire link.
Real emergency availability
A 24/7 desk for urgent refueling and supply, designed for exactly the scenario where the generator shifts from backup to prolonged duty and the reserve falls faster than expected.
Proactive planning, not reaction
We do not wait for the tank to empty or the filter to clog. A supply plan, level monitoring, regular polishing and preventive treatment keep readiness constant — because in a critical system, maintenance has to come before the event.
How It Works
1. Facility profiling — we map the generator array, the power rating, tank volumes, consumption at full load, the SLA target and the level of criticality.
2. A fuel plan for the SLA — we build a scheduled refueling calendar and a reserve matched to the outage duration you commit to bridge, with a regular polishing plan and a pre-defined emergency track.
3. Execution and fuel maintenance — supply and refueling on plan, alongside filtration, polishing and tank cleaning as needed, with full documentation.
4. Continuous readiness — monitoring, reporting and 24/7 emergency response, so the backup chain is ready at every moment — and so you can prove it.
Frequently Asked Questions
How do you make sure the diesel won't fail the generator at the moment of truth?
Through a combination of quality and maintenance. We supply diesel that meets the standard and is suited to long-term storage, and complement it with periodic polishing and filtration that remove water, sludge and microbes. So when the generator has to shift from standby to continuous duty under full load, the fuel delivered to it is clean and dry and does not clog filters — exactly the scenario where neglected fuel fails.
Do you offer 24/7 emergency refueling for data centers?
Yes. Dolek's emergency desk is available around the clock for urgent refueling and supply. The service is built for precisely the prolonged-outage scenario — where the generator runs for hours straight and diesel consumption jumps — so the tank does not drop below reserve before the grid returns.
How often does a data center need fuel polishing and tank cleaning?
It depends on tank volume, storage conditions and consumption rate, but in a critical environment we recommend regular polishing and filtration and proactive tank cleaning — not waiting for a problem to surface. We build a fuel-maintenance plan tailored to your facility, so maintenance comes before the event instead of reacting after it.
Do you provide documentation that supports SLA and uptime compliance?
Yes. We accompany every supply and service with documentation on request — including COA and SDS for the diesel and the transformer oil — so you can present a documented, controlled fuel chain to customers and auditors, as part of proving the backup chain's readiness.
Do you also handle the transformer oil in the facility's substations?
Yes. We supply high-quality dielectric transformer oil meeting the IEC 60296 standard, with COA and SDS on request — so the data center's entire energy envelope, from generator to transformer, stays under one provider.
Do you operate nationwide?
Yes — Dolek Energy operates nationwide with a single service desk and a consistent customer experience, from central Israel to the north and south, including the industrial zones and technology parks where server farms are located.
Your SLA is only as strong as the diesel feeding your generators.
Talk to Dolek Energy and get a complete fuel plan for your data center — quality-assured diesel, scheduled and 24/7 emergency refueling, polishing, tank cleaning and transformer oil, with documentation that supports SLA compliance. So when the grid goes down, you simply keep working.