REP Study Guide 2026
Everything you need to pass the REP exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 REP Exam Format at a Glance
📚 REP Topics to Study (63)
✍️ Sample REP Questions & Answers
1. Which of the following is a primary challenge associated with integrating large-scale renewable energy into traditional power grids?
Traditional power grids rely on the rotational inertia of large, synchronized generators (like turbines in fossil fuel plants) to resist sudden changes in frequency. Renewable sources like solar PV and wind are often connected via inverters and do not inherently provide this inertia, making the grid more vulnerable to instability from supply or demand fluctuations.
2. In a grid-tied PV system, what happens to power generation when the utility grid goes down (without a battery backup)?
Grid-tied inverters are required to detect grid loss and shut down immediately (anti-islanding protection) to prevent energizing lines that utility workers might contact.
3. In geothermal energy, what is the function of a 'separator' in a flash steam plant?
In flash steam plants, the separator uses centrifugal force to separate steam from two-phase geothermal fluid after pressure is reduced, directing steam to the turbine and brine to reinjection or further flashing.
4. Which storage duration category is most appropriate for seasonal energy storage needed to balance renewable generation across months?
Seasonal storage addresses multi-week to multi-month imbalances between renewable generation and load, requiring technologies like hydrogen, synthetic fuels, or large pumped hydro.
5. The 'mitigation hierarchy' in environmental management follows which priority order?
Best practice requires first avoiding impacts, then minimizing unavoidable ones, restoring affected areas, and only then offsetting residual impacts.
6. What is the typical temperature coefficient of power (Pmax) for a standard crystalline silicon PV module?
Most crystalline silicon modules lose approximately 0.3–0.5% of rated power for every degree Celsius above 25°C (STC).