09:17.

  Feeder F12 steps up three kilowatts and holds.

  Erik sees the rise in the lower quadrant of his primary display. The edge is vertical, clean against the baseline. No ramp, no jitter. The plateau stabilizes immediately.

  He waits through it.

  At twelve seconds the trace drops back to its prior level.

  No alarms trigger. No breaker indicators flash. The control room remains evenly lit, the air-handling unit moving a steady volume above the grid of workstations. Two operators at the far end are discussing a scheduled switching window on another feeder.

  Erik scrolls back three minutes.

  Another identical step appears.

  Across from him, Linda angles her chair slightly without removing her headset.

  “F12?” she asks.

  “Third in ten minutes,” he says.

  He overlays regulator tap position. The tap increment trails the spike by a fraction of a second, compensating for the voltage dip during the hold.

  “Reactive,” he says.

  Linda pulls up adjacent feeders and aligns them in time. Their traces remain level.

  Another rise begins while they are watching.

  The line climbs three kilowatts and holds.

  Erik counts silently.

  At nine seconds, voltage margin on the side panel narrows further than during previous plateaus. Still inside tolerance, but closer to lower bound.

  “Margin’s tighter,” Linda says.

  At twelve seconds the line drops.

  Erik widens the time window to one hour. The pattern repeats irregularly-no strict interval-but the amplitude and duration remain consistent.

  “Tag it?” Linda asks.

  He does not answer immediately.

  The next interval approaches. The trace remains flat.

  Five seconds.

  Eight.

  At nine seconds the line rises again.

  He studies the edge.

  A small indicator on Linda’s console blinks.

  “Customer call,” she says, glancing to the side channel. “Short flicker reported. Branch F12.”

  Erik looks back to the voltage margin column.

  “Duration?” he asks.

  “Less than a second. Lights dipped.”

  The plateau ends.

  Linda types briefly.

  “That auto-generates a minor disturbance report,” she says. “Anything above threshold voltage deviation plus customer confirmation.”

  He nods once.

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  The trace remains steady.

  “If we tag it as oscillatory,” she says, “it escalates to upstream review.”

  Another step forms.

  He watches the regulator tap count increase again during the hold.

  “Let’s confirm locally,” he says. “I’ll go out.”

  The turnout to Substation F12 sits off a narrow two-lane road bordered by dormant fields. Frost persists in shaded gravel. A line of spruce trees shields the fence from wind.

  Erik parks and retrieves his handheld meter and insulated gloves. He unlocks the chain-link gate and steps inside, letting it swing closed behind him.

  The yard is compact and orderly: transformer on concrete plinth, switchgear cabinet aligned along the pad, conduit emerging cleanly from below.

  He pauses near the transformer, listening.

  The hum is steady.

  At 09:34 his handheld meter jumps. Three kilowatts. The digits hold.

  He places his gloved hand against the cabinet skin. Through the insulation he feels a slight increase in vibration, subtle but distinct from baseline.

  He watches the digits until they fall.

  The yard settles back into its ordinary hum.

  He checks the cabinet lock. Paint around the hasp is intact. Hinges sit square. He traces the conduit entries visually, scanning for disturbed sealant or fresh tool marks.

  Another spike begins while he is standing near the plinth. The transformer’s tone deepens fractionally during the hold.

  He waits through it before moving.

  At the conduit junction he lowers himself to one knee.

  The seam where conduit meets housing is narrow and even.

  Just below it, against the base plate, a small object interrupts the regular geometry.

  It is matte and angular, roughly the size of his palm. No visible fasteners. No labeling. A thin filament extends from its body and disappears into the seam at the conduit entry. The line is drawn tight.

  He keeps his hands clear.

  The meter rises again. Three kilowatts.

  The cabinet vibrates faintly under his glove.

  The object remains motionless. No indicator lights. No audible change beyond the transformer’s hum.

  At twelve seconds the digits drop.

  He stands and steps back.

  The yard is undisturbed-gravel flat, fence upright, no bent mesh or disturbed ground rods.

  He takes out his phone.

  Linda answers on the first ring.

  “I have a device,” he says.

  “Describe.”

  “Hand-sized. Matte. At conduit seam. Thin line into housing. Lock intact. No visible tampering.”

  “Spike in five seconds,” she says.

  They wait together.

  The meter climbs.

  “Confirmed,” she says.

  Voltage margin tightens again during the hold.

  “Still within tolerance,” she adds.

  The spike drops.

  “I’m adding duty,” she says.

  There is a delay before the supervisor joins the call.

  During it, another interval approaches.

  They wait through eight seconds of flat trace.

  At nine seconds the line rises again.

  The supervisor’s voice enters mid-plateau.

  “Status.”

  Erik repeats the description without embellishment-dimensions, placement, filament tension, intact lock.

  “Voltage?” the supervisor asks.

  “Within tolerance,” Linda says. “Approaching lower bound during hold.”

  “Customer impact?”

  “One flicker reported,” she says. “Auto-filed disturbance.”

  “Critical loads?”

  “None on branch.”

  The plateau ends.

  Silence holds across the line.

  “If left energized,” Linda says carefully, “we can observe additional cycles.”

  “And if margin collapses?” the supervisor asks.

  “No upward trend in amplitude,” she says.

  “Not yet,” Erik adds.

  Another interval approaches.

  Seven seconds.

  Nine.

  The line rises again.

  Erik watches the digits stabilize at three kilowatts.

  “If energized,” he says during the hold, “unknown equipment remains coupled to feeder.”

  “And if isolated?” the supervisor asks.

  “Disturbance ceases. Branch offline.”

  The digits remain fixed.

  The supervisor does not speak immediately.

  At twelve seconds the load drops.

  “Proceed per protocol,” the supervisor says. “Open feeder. Verify zero. Document object. Maintain distance.”

  Erik stands and moves to the switchgear cabinet.

  He secures his gloves and announces the action.

  “Opening F12.”

  He grips the handle and pulls. The mechanism resists slightly before yielding. The internal separation completes with a contained mechanical shift.

  In the control room, Linda watches the trace.

  “Load dropping,” she says. “Zero.”

  Erik checks his handheld meter. The digits sit at baseline.

  They wait through the next expected interval.

  Five seconds.

  Eight.

  Ten.

  Twelve.

  No rise.

  They wait through a second interval.

  Nothing.

  The transformer hum remains steady.

  The object remains at the seam, unchanged.

  “Spikes ceased,” Linda says.

  “Copy,” Erik replies.

  “Disturbance file remains open,” she adds. “Brownout logged. Oscillation flagged.”

  He nods, though she cannot see it.

  He retrieves barrier tape from the truck and stretches it between fence posts around the cabinet, marking a perimeter. The tape tightens under his hands.

  He steps outside the gate and locks it behind him.

  Beyond the spruce line, the branch downstream sits unpowered.

  He remains standing by the fence through one more full interval.

  Five seconds.

  Eight.

  Twelve.

  No movement.

  On his phone, a notification arrives from the operations system:

  Minor Disturbance - F12

  Status: Under Review.

  He lowers the phone and looks once more through the mesh at the small, motionless object against the cabinet base.

  The feeder remains open.

  The file remains active.

  The yard returns to its ordinary configuration, except for the bright tape marking a boundary that was not there that morning.