Test relays and cables for defects
Hook test sets and meters to relays, cables, insulation and circuits, using wiring diagrams to spot defects.
Career profile
Powerhouse, Substation, and Relay Technician
Substation and relay technicians test, troubleshoot and repair power-control equipment in generating stations and substations.
Enjoy following a fault from a drawing to the actual part, then proving your answer before power returns? Here that methodical logic gets hands-on.
A day in the life
Narrow down the likely fault
Set your readings against earlier results, operating conditions, manuals and schematics to locate the probable fault.
Isolate equipment, then repair it
Arrange a shutdown or open switches first when required, then clean, adjust, calibrate, reconnect or replace faulty parts.
Work on protective relay systems
You build, maintain, repair or test the relay and control systems that watch conditions and trigger protective responses.
Log readings, repairs and equipment status
Record test values, cable results, repairs, maintenance and equipment status so later decisions start from trustworthy information.
Quick facts
Medium preparation
United States · O*NET updated 2026
$103,020 median
United States · May 2025
10% growth
United States · 2025-2035
Quick orientation
Preparation, pay & outlook
Preparation
Medium preparationVocational training, related experience, or an associate degree is common. Specific preparation and post-hire training vary by employer and route.
Pay
$103,020 medianNational median annual wage for powerhouse, substation, and relay repairers; the corresponding hourly median was $49.53. A median is not a starting wage or guaranteed offer.
Outlook
10% growthBLS projects employment in this work to rise from 20,900 to 22,900. Projections describe a national estimate, not local hiring.
Fit, tradeoffs & changing tools
You might like this if…
- You like finding faults by combining diagrams, measurements, and physical inspection.
- You can follow exact procedures without treating them as mindless steps.
- You stay patient when a first test does not reveal the answer.
- You are comfortable coordinating closely with coworkers around safety-sensitive work.
Things to weigh
- Protective equipment is routine, and some assignments involve high voltage, hazardous equipment, noise, weather, heights, or awkward spaces.
- Small mistakes can have serious consequences, so careful verification matters even when equipment needs to return to service quickly.
- The work can include standing, climbing, lifting, kneeling, and handling tools or components—not only reading screens and diagrams.
Where AI may help
Test-analysis software can organize readings, SCADA can show system status, digital records can preserve results, and drones can extend visual inspection to hard-to-reach equipment.
What people still lead
Technicians still plan safe isolation, interpret readings in context, choose and complete repairs, coordinate shutdowns, and verify equipment before return to service.
What we can’t predict yet
Tool adoption will differ by employer and equipment. Current BLS projections still show growth for the occupation, but they cannot predict which tools or task mixes a particular workplace will adopt.
Pay in context
Earnings
The clearest national benchmark is the occupation-specific median, which describes the middle worker—not a beginner's expected offer.
National median
The median was $49.53 an hour, or $103,020 a year. Half of workers in this occupation earned more and half earned less.
The national spread
In May 2025, the 10th-percentile annual wage was $65,730 and the 90th-percentile wage was $129,920. These are wage percentiles, not starting and senior salaries.
Getting started
Paid substation apprenticeship
One current utility example is a four-year program; other sponsors set their own length and progression rules.Paid
- What the route involves
- Work and study under a substation technician, moving through safety, electrical theory, substation equipment, relays, automation, and equipment testing.
- What it can lead to
- At Fort Pierce Utilities Authority, completing the program and its required evaluations is designed to qualify an employee as a Substation Relay SCADA Technician.
- What to check
- This is one Florida utility example, not a national admission rule. FPUA lists a high school diploma or equivalent, computer knowledge, a valid Florida operator's license, and a Class A CDL or the ability to obtain one within three months; basic electrical knowledge is preferred.
Electronics certificate or associate degree
Usually a postsecondary certificate or two-year program; verify the actual curriculum and lab access.
- What the route involves
- Study AC and DC electronics, electronic devices, controls, and microcontrollers, preferably in a program with hands-on labs.
- What it can lead to
- Builds an electronics foundation that employers may prefer and matches the certificate or associate-level preparation commonly reported for this work.
- What to check
- BLS does not present this credential as a universal requirement. After hiring, training still varies by position and employer.
Related electrician experience
- What the route involves
- Build experience installing, maintaining, and troubleshooting electrical systems before applying to power-equipment or relay roles.
- What it can lead to
- Supplies related work experience that BLS identifies as one possible bridge into powerhouse, substation, and relay repair.
- What to check
- This is a possible route, not a universal prerequisite, and employers may still require specialized relay or substation training.
Entry requirements differ by employer. Compare a paid apprenticeship with building an electronics foundation or bringing related electrician experience.
After entry
Career paths
This starts where the entry routes leave off: early work, growing capability, and advancement or specialization.
Get established
After hiring, learn the employer's safety rules, equipment, drawings, test methods, and records through formal instruction, hands-on work, and shadowing an experienced technician.
Develop capability
Take on more testing, fault isolation, component work, and post-repair verification across the systems used at your site.
Advance or specialize
Deepen your work in protective relays and controls, substation equipment, generating-station systems, calibration, or coordination of complex tests and repairs.
- Move toward planning, supervising, or teaching specialized testing and maintenance work.
Where you can work
Generating stations
Maintain and test electrical equipment within operating power facilities, where coordination, noise control, protective gear, and precise shutdown procedures matter.
- Indoors
- Outdoors
- Physical demands
- Safety-sensitive
Substations
Inspect and repair transformers, breakers, regulators, cables, and related equipment at field sites that may expose you to weather and require travel.
- Outdoors
- Field work
- Travel
- Physical demands
- Safety-sensitive
Relay and control spaces
Test protective relays, wiring, control systems, and recorded signals in equipment rooms, shops, or lab-like spaces where detailed diagrams and test data drive the work.
- Indoors
- Lab
- Safety-sensitive
Try the reasoning
Trace a worked fault
Ask an electrical instructor for a beginner circuit or relay worksheet that includes a diagram, labeled readings, and a worked answer. Before viewing the answer, spot the first reading that differs from the expected value, trace its path to the likely fault, and write a two-sentence handoff naming the result and next check. Notice whether you enjoy both the fault tracing and the careful record.
Stay safe: Keep this exercise to paper or simulation. Do not open or test real electrical equipment.
Sources
- O*NET OnLine. Electrical and Electronics Repairers, Powerhouse, Substation, and Relay (49-2095.00). Accessed 2026-09-23.
- U.S. Bureau of Labor Statistics. Electrical and Electronics Installers and Repairers. Accessed 2026-09-23.
- U.S. Bureau of Labor Statistics. Occupational Employment and Wage Statistics Frequently Asked Questions. Accessed 2026-09-23.
- Fort Pierce Utilities Authority. Apprentice Substation I-IV Class Specification. Accessed 2026-09-23.