Maintenance, inspection and ageing assets
240 lessons from 221 energy incidents, newest first, grouped by technology. Each is taken from the entry it links to, which has what happened and the sources.
Battery storage 10
Spare PCS units kept on site allow fast replacement after short-circuit faults.
A clamp failure in a Tesla Megapack led to a coolant leak, so operators should inspect clamps on identical units before full reactivation after shutdown.
Repeat fires at sites run by the same operator are a reason for independent inspection and for sharing root-cause findings once they are known.
Maintenance agencies must finish a full technical check after any battery fire before systems restart.
Home storage already covered by a replacement campaign can still be involved in a fire, so outstanding exchanges should keep being tracked.
Operators should plan for long lead times on specialised battery replacements, given that units for defective Centipede models were unavailable until late 2024.
Open a lithium iron phosphate battery container door only under controlled conditions, because a sudden inrush of air can cause flash ignition.
Lithium-ion battery storage at a solar site needs a dedicated operations and maintenance budget and named inspection responsibility.
Inspect all identical units when water intrusion is found in one Megapack, since 88 units on site had the same defect.
Liquid cooling system leaks in Megapack units can cause arcing in power electronics, so pressure test and inspect every circuit after installation before energisation.
Solar PV 78
After a vegetation fire, affected cabling should be inspected before equipment is returned to service.
Early acreage figures for a vegetation fire at a solar farm should be treated as provisional until crews can inspect control lines in daylight.
Where the cause is unknown, operators should not assume the fire began in electrical equipment, and should still inspect the site once it is safe.
Keep vegetation beneath and around solar arrays managed so it does not become a ready fuel load.
After a tornado warning, solar farms on the reported track need a prompt inspection, because panels can be torn out and left as debris.
Record an accidental finding and share it so operators can review inspection of warehouse rooftop arrays.
Leave the cause to the fire investigation and preserve the installation for inspection.
A short closure for inspection after a fire supports a safer reopening.
Solar systems require the same design, installation and maintenance standards as other household electrical equipment.
Homeowners should use licensed installers, ensure fire code compliance and schedule post-installation inspections.
A later fire at the same array is a reason to review earlier repairs and the condition of cabling, not only the panels that were replaced.
Vegetation in a photovoltaic field can burn even when the electrical installation is not damaged, so fuel management around panels still matters.
Inverter replacement on rooftop arrays must use only qualified staff, or an electrical fault can start a fire.
Operators must check qualifications before electrical maintenance, to stop unqualified work on live equipment.
A small fire at a home with solar equipment may be put out by the owner, yet the system must be inspected before reuse to confirm no hidden damage.
A vegetation fire on a road beside a solar plant can reach plant grounds even when the equipment is not damaged.
Where the ignition cause is unknown, operators should record conditions at the site boundary for later review.
Rooftop solar panels on occupied buildings need regular inspection to spot electrical or thermal faults before ignition.
Before reenergising a solar array after a fault, identified connector and wiring defects should be remediated and independently verified.
A grass fire on solar farm land may affect panels or cabling even after it is put out, so post-incident inspection of all equipment is required.
Four to five inch grass around solar panel rows can fuel fires, so operators should cut vegetation to keep fuel loads low.
A vegetation fire near solar arrays needs coordinated forestry and fire rescue response to stop it reaching equipment.
Operators of off-grid solar plants should ensure documented maintenance and on-site presence to limit fire risk.
Roads around a solar farm act as firebreaks, so site plans should use them to speed containment of vegetation fires.
Solar sites with pylons need a response plan that covers vegetation and electrical fire together.
Wind load design and attachment methods for carport solar installations require verification against local conditions.
Review and update site-specific risk assessments for routine maintenance tasks in dry or grassy areas.
No cause was reported, so a similar event should be investigated before any design or maintenance change is assumed.
Review and act on inspection findings from solar panel incidents without delay.
Maintain a programme of proactive inspections for installations predating current standards.
Regular inspection and maintenance of roof-mounted solar arrays can help identify wear that leads to electrical faults.
A vegetation fire on a solar farm can cover a large area even when damage to panels or other equipment is not reported.
Roof-mounted solar arrays should be inspected for animal intrusion, which can damage wiring and create a fire risk.
A vegetation fire on a solar farm should be recorded separately from damage to the arrays, because panels can remain undamaged.
Mowing equipment on solar farms can strike rocks and create sparks that ignite dry vegetation.
Mutual aid from several fire agencies allows quick containment of vegetation fires at solar sites.
Keep installation and maintenance records so damage and cause can be checked after a fire.
Maintain clear vegetation management zones around solar arrays to reduce ignition risk from external fires.
Ensure vegetation management plans account for drought and wind conditions at solar sites.
Inspect for wildlife or debris under arrays during maintenance.
After a vegetation fire, operators should inspect arrays and access routes rather than relying only on a first visual check.
After a rooftop solar fire, keep power to the array off until the system has been inspected.
Do not restart generation until the installer has inspected the array and confirmed it is safe.
Electrical faults in photovoltaic systems require specific inspection regimes beyond standard building maintenance.
An abnormal electrical event that is not yet specified still warrants inspection of the array and associated wiring after a fire.
Install and maintain fire breaks around and within solar arrays where dry vegetation is present.
Treat modules as still able to produce electricity in sunlight, and keep combustible vegetation away from equipment that can fail hot.
Rooftop solar on occupied medical buildings should be included in fire risk assessments and routine inspection.
Regular inspection and maintenance of rooftop solar installations can identify faults before they lead to fire.
Roof-mounted solar cabling should be inspected so electrical faults can be found before they ignite.
Vegetation work beside solar arrays should be planned so that mowers and other equipment do not ignite dry grass.
After a grass fire, modules and nearby electrical equipment should be inspected before the array is returned to service.
Connectors and wiring are a known origin of photovoltaic fires, so inspection of those parts should be planned.
High rates of cell cracks across a site can accompany junction box faults, so use EL imaging at commissioning to find defects that visual inspection misses.
Review vegetation management where panel damage is already known.
The array and the roof should be inspected before the system is put back into use.
After a roof fire involving solar equipment, the roof structure should be inspected before the building is treated as safe to use.
Poor installation and lack of maintenance are leading causes of ignition in photovoltaic systems, so operators should check installation records and maintenance logs for rooftop arrays.
Roof-mounted solar connectors should be inspected regularly for damage, looseness and overheating.
A later fire in the same area is a reason to review site vegetation and previous investigation findings once they are released.
The newest 60 of 78 shown. The rest are on each solar pv entry.
Wind (onshore) 30
A staged return after inspection limits the chance that a similar defect remains in service.
A prompt technical assessment can show whether similar turbines need inspection before they return to service.
Take the affected turbine out of service until the cause and the condition of the machine are known.
Heavy plant routes at wind developments on unstable terrain must be inspected for edge risks.
Insurers should require checks on turbines after 15 years in service, as ageing fleets need targeted inspection.
After a fatal fall, the task, harness use and conditions should be recorded so the cause can be established.
Site owners must maintain auditable certification of equipment used by contracted maintenance crews independent of their own systems.
Log and investigate third party noise reports as potential condition data for changes in noise or vibration.
Owners of GE 5.X platform turbines should review inspection needs while the cause remains unknown.
Keep landowners and local councils updated while inspection and repair plans are still forming.
Operators should inspect elevator shaft guarding on all turbines after any entrapment report.
Earlier fires at the same plant warrant targeted inspection of similar machines.
Keep a record of gust conditions and any video so a later check can test the reported trigger.
Ageing turbines no longer serviced by the manufacturer need a clear maintenance plan for safety-critical parts such as brakes.
Start a cause investigation and further inspections while evidence is still available.
Secure movable plant parts, including bale arms, before cleaning or maintenance starts.
Assess the risks of every task involving plant, including routine cleaning.
Label all high-voltage cabinets clearly and unambiguously before maintenance begins.
A precautionary shutdown can limit further damage while repair or replacement is arranged.
Elevated wind and low humidity should prompt heightened readiness where turbines stand in dry vegetation.
Burning debris from a turbine can ignite ground vegetation, so vegetation management and containment around the base matter.
Crane repairs for elevated turbine damage must allow for seasonal ground conditions that can delay access until spring.
Turbine fires can readily ignite dry vegetation beneath and around the structure.
Treat crane work on a wind construction site as a high-risk lift, with a written plan, exclusion zones and a stop rule if conditions change.
A turbine fire in a six-turbine park requires temporary shutdown of co-located turbines for inspection.
Repeat turbine fires at sites in the same fleet within days should prompt a review of common causes such as component design or maintenance.
A fire in one Nordex Gamma turbine forced shutdown of all 44 turbines at Midtfjellet until inspection confirmed safety.
After a turbine fire, the manufacturer must inspect the full site before restart to rule out shared faults across N90 and N100 units.
A turbine explosion can ignite vegetation, so sites must plan for both asset and ground fire response.
A single confirmed failure in a start-up system can affect a whole fleet, so owners should replace the component across all units of that model.
Wind (offshore) 3
Collision investigations should record the vessel track, conditions and the turbine identity so operators can judge whether navigation or marking failed. The cause of this collision has not been reported.
Temporary limits on generation may be needed in high winds so that an alternative route is not overloaded.
Operators must hold environmental contingency plans for offshore maintenance, ready for debris in the sea or on shorelines.
Grid infrastructure 107
Inspect and maintain street-level transformers so faults are found before a failure.
Treat a suspected overload as a reason to check loading and take the asset out of service until it is safe.
Vegetation near overhead lines should be managed on a cycle that matches the growth risk, and resident reports of overhanging limbs should be checked rather than deferred without a site look.
Where the cause is unknown, inspect the affected cabinets and similar nearby units before they are returned to service.
Until the cause is known, operators should treat similar plant as needing inspection before it is returned to service.
Treat a single on-site account of the cause as provisional until the failed equipment is inspected.
Inspection and repair of distribution poles and wiring in busy market areas can reduce the chance of a repeat.
After power returns, crews should still inspect the transformer and pole, because a brief interruption does not show that the asset is undamaged.
Verify substation safety conditions thoroughly before allowing personnel to commence post-incident repairs.
Immediate technical investigation after cell fires supports timely replacement and network restoration.
After a fatal transformer blast, the failure mode must be recorded before replacement to avoid repeat events at the same site.
A pole-top fire on distribution equipment may leave the transformer intact, so operators should inspect before ordering replacement parts to limit downtime.
Repeated fire or explosion events at one substation require a full condition review, because reactive repairs have not stopped recurrence.
Mini-transformers and feeders at distribution substations need targeted inspection when general failure descriptions are given.
Ageing substation infrastructure needs targeted inspection where damage patterns suggest possible interference beyond normal wear.
A distribution transformer explosion can send high voltage into nearby homes and damage meters and wiring, so operators should inspect all properties within the affected area after such an event.
Visible damage to substation equipment after a fault requires inspection before return to service.
Utilities need rapid access to replacement transformers and cabling to limit multi-day outages after substation fires.
Restoration after a substation transformer failure requires a plan to replace the unit and verify when linked services recover.
Substation transformers near rated capacity risk catastrophic failure when ageing infrastructure is present.
Ageing infrastructure and poor maintenance raise the chance of overload faults leading to fire.
Substation equipment failure can trigger repeated outages, so operators should inspect for stress after the first event rather than wait for another.
Root cause checks must include external interference as well as equipment condition and maintenance history.
Pole-mounted transformer faults can ignite nearby vegetation, so operators should maintain hedgerow clearance around substations.
Overhead lines feeding substations must be inspected for wear, as a break can drop the conductor and create arcs that start fires.
Ground-mounted distribution transformers should be checked for thermal overload when serving buildings during heat waves above 100 degrees Fahrenheit.
Insulating oil can intensify a transformer fire, so owners should inspect oil condition and seals on distribution transformers as part of routine maintenance.
Transformer explosions at extra-high-voltage substations can ignite nearby vegetation, so operators should maintain firebreaks and clear vegetation around the site.
Substation fire leaves some maintenance outstanding after initial repair, so operators should schedule follow-up work to restore full redundancy.
Shortage of replacement transformers across the grid delays repair of substation damage and extends outages.
High summer demand in tourist areas raises fire risk in ageing grid assets, so maintenance must be completed before the peak season.
Instrument transformers on the lower-voltage side of inter-bus transformers need regular inspection, because a fault there can damage the main transformer.
A further substation failure in the same town within days is a reason to inspect similar equipment, even when the cause of the first event is not yet known.
Operators should check doors and entry mechanisms during routine inspections.
Keep the failed unit available for inspection so the failure mode can be identified when more information appears.
Stocktaking of spare parts across locations aids quicker deployment of replacement equipment.
Restoration estimates should be updated as site conditions become clearer.
Sparking from pole mounted equipment can ignite vegetation, so operators should improve vegetation management around distribution poles.
Control room fire investigations must check both internal condition and external load factors before naming a root cause.
High voltage cabling at substations must be fully inspected after a fire, as three metres were destroyed in the repeat event.
A transformer explosion can ignite vegetation fires, so operators should plan for rapid multi-agency response to secondary blazes.
Transformer failures at nearby sites can coincide with substation fires, so utilities must inspect all local assets under high load.
A pole-mounted transformer fire can throw burning debris onto nearby cars, so operators should clear vegetation and enforce vehicle exclusion zones around such units.
Remote sites need pre-positioned spares, as arranging a replacement from Imphal takes up to five days.
An electrical substation that fails soon after repair needs checks for network overload before further use.
Overloading during peak tourist periods can lead to substation explosion, so operators should review seasonal capacity.
Equipment over 30 years old in distribution systems should be inspected and replaced to avoid sudden failure.
Sites with prior current transformer or transformer explosions need extra condition checks because repeat failures extend repair time.
Substation equipment failure can trigger wide outages without external triggers. Operators should inspect and maintain substation assets on a routine schedule.
Basic maintenance on the unit last took place in 2018, outside policy intervals, so operators should avoid repeated deferral of invasive maintenance on critical ageing assets.
A second transformer fire in the same area within weeks is a prompt to inspect nearby equipment, even when neither cause has been reported.
Prompt assessment of damage to cabling and control units supports faster restoration while avoiding overload on remaining equipment.
Maintain regular vegetation management around substation perimeters to reduce external fire exposure.
Plan phased restoration after a substation fire so remaining plant is not overloaded.
Do not state a cause until inspection distinguishes an equipment defect from other ignition sources.
Distribution operators should track local load growth from air conditioning and other new appliances and reinforce transformers before ratings are breached.
Inspect distribution transformers for oil leaks before peak summer load, as an oil leak led to a transformer fire.
Vegetation contact on 400 kV overhead lines can start an N-2 condition, so operators must survey and clear growth on high voltage corridors on a risk-based cycle.
Accelerate predictive and preventative maintenance so ageing substation plant is less likely to fail in service.
Assets with no reported prior faults can still fail, so inspection regimes must not be relaxed on a clean record.
The newest 60 of 107 shown. The rest are on each grid infrastructure entry.
Data centre 8
After a fire at a data centre, keep the affected facility shut until safety assessments and technical inspections are complete.
Inspections of electrical wiring in meter rooms need controls that keep a short circuit from injuring the people doing the work.
Ensure regular inspection and maintenance of electrical systems in data centre facilities.
A binding checklist before recommissioning can catch steps missed after maintenance.
Test disaster recovery under realistic failure conditions, including loss of power at the primary site.
Water paths near electrical equipment should be inspected so a leak cannot reach live gear.
Until an inspection reports, treat a server-room fire as an electrical event of unknown cause and do not assume a single trigger.
Routine maintenance in data centres can produce conditions that activate safety shutdowns.
Hybrid co-located 3
Ageing lithium-ion units need closer degradation checks, as normal end-of-life should not produce fire.
Joint police and fire inspections after an ESS fire help determine root cause when the origin is inside the battery unit.
Temperature and humidity controls in battery enclosures must match local climate conditions.
Other 1
Maintenance for large fields of moving mirrors needs to account for the number of individual components.
Behind these lessons. Of the 221 incidents these lessons come from, the paid record names the root cause for 168 and the part that failed for 148, with the companies involved and every source. See what a subscription opens or read a complete record.