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 key facts
- The AEE REP exam is all multiple choice, and the number of questions per topic follows the weightings in the REP Body of Knowledge. Source
- The AEE REP certification exam is a four-hour, open-book exam. Source
- The AEE Certified Renewable Energy Professional (REP) certification application and examination fee for US candidates is $400 and is nonrefundable. Source
- Candidates who fail the AEE REP exam must wait at least 60 days after their previous exam date before retaking it. Source
- An AEE REP certification is valid for 3 years, the same as every AEE certification. Source
📋 REP Exam Format at a Glance
📚 REP Topics to Study (29)
✍️ 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. What term describes the practice of charging storage systems during low-price periods and discharging during high-price periods to capture wholesale electricity price spreads?
Energy arbitrage exploits time-of-use price differentials by storing cheap off-peak energy and selling it back during expensive peak hours.
3. When comparing direct-drive wind turbines to traditional geared-drive turbines, what is a significant advantage of the direct-drive design?
Direct-drive turbines eliminate the need for a gearbox, which is a complex mechanical component prone to wear and failure. By connecting the rotor directly to the generator, these turbines have fewer moving parts, leading to increased reliability, reduced maintenance requirements, and lower operational noise.
4. Which grid service involves an energy storage system automatically responding within seconds to stabilize grid frequency deviations?
Frequency regulation requires fast-responding assets (often within 4 seconds) to correct imbalances between generation and load, maintaining grid frequency near 60 Hz.
5. What is the primary function of a bypass diode in a photovoltaic module?
Bypass diodes allow current to flow around shaded or damaged cells, preventing hotspot damage and maintaining power output.
6. A battery energy storage system (BESS) has a round-trip efficiency of 85%. If 100 MWh is stored, how many MWh are available for discharge?
Round-trip efficiency represents energy out divided by energy in, so 100 MWh × 0.85 = 85 MWh delivered to the grid.
🎯 Free REP Practice Tests
📖 REP Guides & Articles
What Practice Test Geeks adds beyond an AI chat for REP
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length REP mock exam — 100 questions in 240 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed REP question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable REP cheat sheet you can print or save as a PDF.
- REP flashcards built from the same question bank.
- Free REP practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- education.aeecenter.org — Registration deadline · verified Oct 2026
- aeecenter.org — Test delivery, exam dates, fees, renewal, retake fee, exam format, retake policy, score release, score validity · verified Oct 2026
- portal.aeecenter.org — Time limit · verified Oct 2026