IESO interview process & guide 2026
Everything we know about interviewing at IESO: what each round tests and compensation by level.
How hard is the IESO interview?
Aggregated from 68 interview experiencesAbout 1 in 2 candidates with a known outcome convert.
What IESO actually tests for
How prominent each skill is across reported loopsFind the guide for your role
This is your next step: open the guide for the role you are interviewing for. Each one carries the questions IESO interviewers actually ask that position, the loop structure, and pay by level.
What IESO pays, by level
Estimated total compensation: base salary plus stock and annual cash bonus.
IESO interview FAQ
Answered from real candidate and workplace dataHow hard is the IESO interview?
Candidates most commonly rate IESO interviews as medium, based on 68 reported interviews. About 49% of candidates who interview go on to receive an offer.
How much does IESO pay?
Reported total comp across roles at IESO ranges from roughly $98k to $140k per year, varying by level, team, and location.
What topics does IESO test in interviews?
IESO interviews most often cover Reactive Power, Electricity sector knowledge (Ontario energy context), Explaining Complex Topics, Power grid operations (high-level), and Real Power vs Reactive Power. The exact emphasis depends on the specific role you apply for.
What roles can I prepare for at IESO?
Dataford has interview guides for 3 roles at IESO, including Business Analyst, Research Analyst, and Software Engineer.
Ready for your IESO interview?
Practice the exact questions from this guide with AI feedback, and walk into your loop knowing what to expect.