Master Your Electric Power Engineer Interview
Explore real-world questions, expert answers, and actionable tips to showcase your expertise and land the role.
- Understand core technical concepts and how to articulate them
- Learn proven STAR‑based responses for behavioral scenarios
- Identify key competencies hiring teams evaluate
- Practice with timed mock rounds to build confidence
Technical Knowledge
While planning a new substation for a growing industrial park, the utility needed to assess voltage profiles across the network.
Perform a comprehensive load flow study to determine if existing infrastructure could support the added demand.
Used PSS/E to model the network, inputting forecasted loads, line impedances, and generator settings; iterated to achieve convergence and evaluated voltage drops and line loading.
Identified a 5 % voltage drop at the farthest bus, prompting the recommendation of a capacitor bank and a line upgrade, which prevented future reliability issues and saved the client $250k in unplanned outages.
- Which software tools have you used for load flow studies?
- How do you handle convergence problems in large networks?
- Can you describe a time when load flow results led to a design change?
- Clarity of explanation
- Depth of technical detail
- Use of specific tools/methods
- Demonstrated impact on project decisions
- Vague description without mentioning voltage or line loading
- No reference to software or methodology
- Missing outcome or business impact
- Define load flow (power flow) study
- List required data (bus types, impedances, loads, generation)
- Describe typical software/tools (PSS/E, PowerWorld)
- Explain solution method (Newton‑Raphson, Gauss‑Seidel)
- Interpret key results (voltage magnitude, line loading, losses)
- Connect results to planning decisions
During a design review for a wind farm integration project, the team debated generator types for the new turbines.
Explain the operational and construction differences between synchronous and induction generators to guide the selection.
Outlined that synchronous generators produce a constant frequency output, require excitation systems, and can operate as voltage sources; induction generators are slip‑ring or squirrel‑cage, rely on external reactive power, and act as current sources, often simpler and cheaper but need reactive support.
The team chose induction generators for the wind turbines due to lower cost and reduced maintenance, while planning capacitor banks for reactive support, aligning with project budget and performance goals.
- In which applications would you prefer a synchronous generator?
- How do you provide reactive power to an induction generator?
- Accurate technical distinctions
- Relevance to real‑world applications
- Clear comparison format
- Confusing terminology
- Omitting reactive power aspect
- Construction: rotor design (field winding vs. squirrel‑cage)
- Excitation: external source needed vs. self‑excited via slip
- Voltage regulation: constant voltage vs. variable
- Starting method: direct on line vs. using converters or external supply
- Applications: large hydro/thermal plants vs. wind/industrial drives
The utility required a new 138 kV line to connect two substations in a flood‑prone region, with strict NERC reliability standards.
Develop a comprehensive protection scheme that ensures rapid fault clearance while meeting coordination and selectivity requirements.
Conducted a fault study using ETAP to calculate prospective fault currents; selected distance relays (48 %/67 % zones) at both ends, added a pilot protection (line differential) for high‑speed clearance; coordinated settings with adjacent line and transformer protections; incorporated reclosing logic per NERC PRC‑005‑2; added ground fault detection with zero‑sequence relays and integrated communication via IEC 61850 for remote tripping.
The scheme achieved a clearing time under 30 ms for phase faults and under 100 ms for ground faults, met all coordination margins, and passed the utility’s reliability audit, reducing expected outage duration by 40 % compared to legacy protection.
- What software do you use for protection coordination?
- How do you handle protection for series compensation?
- Explain the role of reclosing in transmission protection.
- Methodical approach
- Inclusion of standards (NERC, IEEE)
- Clear coordination strategy
- Quantified performance metrics
- Skipping fault study
- No mention of coordination or standards
- Perform fault level calculations
- Select primary protection (distance relays) and backup (over‑current)
- Add pilot protection for high‑speed clearance
- Coordinate settings with adjacent equipment
- Incorporate ground‑fault detection
- Ensure compliance with NERC/IEEE standards
- Validate via simulation and field testing
Project Management
In 2022 I led a $12 M upgrade of a 115 kV substation that involved civil engineers, protection engineers, and procurement specialists.
Ensure the project stayed on the critical path, meet the utility’s deadline before the summer peak, and stay within budget.
Implemented a detailed Gantt chart, held weekly cross‑functional stand‑ups, used a RACI matrix to clarify responsibilities, and introduced a risk register that flagged supply‑chain delays; negotiated fast‑track shipping for critical transformers and secured an alternate vendor for surge arresters.
The upgrade was completed two weeks ahead of schedule, under budget by 3 %, and passed the post‑commissioning reliability test with zero defects, contributing to a 5 % reduction in outage frequency during the peak season.
- How did you handle a conflict between civil and electrical teams?
- What tools did you use for schedule tracking?
- Leadership and coordination examples
- Quantifiable results
- Risk management approach
- Vague team description
- No measurable outcome
- Define project scope and objectives
- Establish schedule and critical path
- Set up communication cadence
- Identify and mitigate risks
- Track budget and adjust as needed
- Deliver results and measure outcomes
During a month when three substation retrofits were slated for commissioning, each had overlapping resource demands.
Determine which tasks to address first to avoid bottlenecks and ensure all projects met their go‑live dates.
Applied the Eisenhower matrix to categorize tasks by urgency and impact, consulted stakeholder impact analyses, and used a weighted scoring model (impact × deadline × resource availability) to rank activities; communicated the priority list to all teams and re‑allocated resources accordingly.
All three retrofits were completed on time, with no overtime costs, and stakeholder satisfaction scores improved by 15 %.
- Can you give an example of a scoring formula you used?
- How do you handle last‑minute changes?
- Structured prioritization method
- Stakeholder focus
- Outcome orientation
- No systematic approach
- Assess urgency vs. importance
- Gather stakeholder impact data
- Use a scoring or matrix method
- Communicate priorities
- Adjust resources
Mid‑project on a 33 kV feeder automation rollout, material costs for smart switches rose 18 % due to supply shortages.
Contain the budget overrun while maintaining project scope and timeline.
Conducted a variance analysis to isolate cost drivers, renegotiated contracts with the vendor for volume discounts, identified alternative suppliers for non‑critical components, and re‑sequenced work to defer non‑essential items to the next fiscal year; presented a revised budget and mitigation plan to senior management with clear ROI justification.
Reduced the projected overrun from $500 k to $120 k, secured approval for the adjusted plan, and completed the automation rollout within the revised budget, delivering a 12 % improvement in fault detection speed.
- What metrics do you track to detect overruns early?
- How do you gain stakeholder buy‑in for scope changes?
- Analytical rigor
- Negotiation skills
- Clear communication
- Blaming external factors without mitigation
- Identify cause of overrun
- Analyze cost breakdown
- Negotiate with vendors
- Find alternative solutions
- Re‑plan schedule and scope
- Communicate with stakeholders
Safety & Compliance
Our region was preparing for the annual NERC compliance audit for the transmission fleet.
Implement processes that guarantee ongoing adherence to NERC PRC‑005‑2 and PRC‑010‑2 standards.
Established a compliance calendar mapping each standard to quarterly self‑assessments, integrated automated monitoring of key reliability metrics (SAIDI, SAIFI) into the SCADA system, conducted training workshops for operations staff, and performed internal audits with corrective action tracking in a centralized database.
The audit resulted in zero non‑compliance findings, and the region earned a commendation for proactive reliability management, contributing to a 3 % improvement in overall system availability.
- How do you handle a finding that requires immediate corrective action?
- What tools do you use for metric tracking?
- Understanding of specific NERC standards
- Proactive process design
- Evidence of successful audit
- General statements without NERC references
- Create compliance schedule
- Automate metric monitoring
- Conduct staff training
- Perform internal audits
- Track corrective actions
During the erection of a new 230 kV tower, I noticed that the grounding rods were installed with insufficient depth, posing a shock risk for crews.
Mitigate the hazard before work resumed and ensure compliance with OSHA and IEEE grounding standards.
Immediately halted work, documented the issue with photos, convened a safety toolbox talk with the crew, coordinated with the contractor to redesign the grounding layout to meet the required 10 ft depth, and updated the site safety plan; performed a follow‑up inspection before resuming work.
The corrected grounding prevented any electrical incidents, the project stayed on schedule, and the incident was logged as a zero‑recordable event in the quarterly safety report.
- What documentation do you keep for safety incidents?
- How do you ensure contractors adhere to safety protocols?
- Prompt hazard identification
- Effective communication
- Corrective action implementation
- Continuing work despite hazard
- Identify hazard
- Stop work and document
- Communicate with crew and contractors
- Implement corrective action
- Verify and resume work
The IEEE 1547 standard for interconnection was revised, affecting our distributed generation projects.
Ensure our design team incorporates the latest requirements without project delays.
Subscribe to IEEE and NEMA newsletters, attend the annual IEEE PES conference, participate in the local utility’s code‑update webinars, and maintain a shared knowledge base where updated clauses are logged; I also schedule quarterly review meetings to disseminate changes to the engineering team.
Our next DG project was completed with full compliance to the 2023 IEEE 1547 revision, avoiding re‑work and earning positive feedback from the client for proactive code adherence.
- Which standards have the biggest impact on your daily work?
- How do you verify that a design meets the latest code?
- Active learning habits
- Knowledge sharing mechanisms
- Passive reading without application
- Subscribe to professional bodies
- Attend conferences/webinars
- Maintain internal knowledge repository
- Regular team briefings
- load flow
- grid modernization
- NERC compliance
- protective relaying
- project management
- power system analysis
- safety engineering