REP Cheat Sheet 2026

The 30 highest-yield REP facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. How does life cycle assessment (LCA) benefit sustainability? → By assessing environmental impacts throughout the product life cycle
2. How do energy efficiency standards impact buildings? → They reduce energy use and increase performance
3. Why are renewable portfolio standards (RPS) significant? → They promote renewable energy adoption
4. What is the primary purpose of energy policy? → To ensure a reliable, affordable, and sustainable energy system
5. Which of the following is a primary challenge associated with integrating large-scale renewable energy into traditional power grids? → Reduced system inertia
6. What is a primary benefit of using solar photovoltaic (PV) systems? → They provide renewable, clean energy with minimal emissions
7. How can a sensitivity analysis benefit a renewable energy project? → By evaluating financial impact of variable changes
8. When designing a solar PV system, the term 'solar insolation' is a critical factor in performance estimates. What does this term measure? → The amount of solar radiation energy received per unit of area over a given time
9. Which technology is most commonly used to generate electricity from wind? → Wind turbines
10. What is the main environmental advantage of renewable energy? → They reduce air pollution and greenhouse gas emissions
11. Why is risk assessment important during financial analysis? → To better predict and mitigate potential negative impacts
12. A manufacturing plant reduces its peak demand charge on its electric bill by staggering the startup times of its large motors. This strategy is an example of: → Load management or peak shaving to reduce demand charges
13. Which agency primarily regulates energy policy in the U.S.? → Department of Energy
14. Which factor most affects capital cost estimates? → Technology type and location factors
15. What role does a financial model play in energy project planning? → It forecasts economic performance and viability
16. What is a key benefit of sustainable building practices? → Lower operational costs and energy use
17. What role do green certifications play in sustainability? → They verify compliance with sustainable design and operations
18. What is the main advantage of geothermal energy? → It provides consistent and reliable energy output
19. Which factor is most critical in siting a wind farm? → Consistent high wind speeds
20. Which sector typically accounts for the largest share of total U.S. energy consumption, making it a major target for efficiency programs? → Industrial
21. What is a compliance audit in energy regulation? → An inspection of energy usage and adherence to laws
22. Which of the following is considered the primary rate-limiting step in the anaerobic digestion of fibrous or complex solid organic waste? → Hydrolysis
23. What does the term 'negawatt' refer to in energy efficiency discussions? → A unit representing electricity saved through conservation or efficiency measures
24. Which of the following is a significant socio-environmental impact that must be carefully managed when developing large-scale reservoir hydropower projects? → Displacement of communities and habitat fragmentation
25. When comparing pumped-hydro storage (PHS) with battery energy storage systems (BESS) for grid-scale applications, what is a key advantage of PHS? → Longer operational lifespan and lower levelized cost of storage
26. Which regulation addresses emissions from power plants in the U.S.? → Clean Air Act
27. In a horizontal-axis wind turbine (HAWT), what is the primary function of the yaw control system? → To orient the rotor to face directly into the wind.
28. What is a primary purpose of a feasibility study in renewable energy projects? → To evaluate project viability across multiple factors
29. What is a project milestone in energy project planning? → Completion of key phases or deliverables
30. Which of the following is the correct sequence of the four primary stages in the anaerobic digestion process for biogas production? → Hydrolysis, Acidogenesis, Acetogenesis, Methanogenesis