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Flywheels can respond in milliseconds, making them ideal for frequency regulation. Lithium-ion batteries (A) are fast but slower than flywheels, pumped hydro (B) and compressed air (D) have slower response times. Certified Energy Managers select storage technologies based on application requirements.

Repairing leaks prevents energy waste and improves system efficiency. Increasing pressure (A) and larger compressors (C) raise energy use. Continuous operation (D) is inefficient. Certified Energy Managers prioritize leak management for energy and cost savings.

The Simple Payback Period (SPP) is calculated by dividing the initial investment by annual savings, showing how many years are needed to recover costs. It is straightforward but does not account for time value of money, escalation, or project lifespan. ROI (A) expresses profitability as a percentage, NPV (B) incorporates discounted cash flows, and IRR (C) identifies the break-even discount rate. For Certified Energy Managers, SPP is a common metric for quick screening of projects, but candidates must understand its limitations compared to more advanced methods like NPV or IRR.

A deaerator removes dissolved gases (primarily oxygen and carbon dioxide) from boiler feedwater, preventing corrosion in boiler and steam distribution systems. Preheating with flue gases (A) is done by economizers, while blowdown losses (C) are controlled with blowdown systems. Combustion air supply (D) is managed separately. For Certified Energy Managers, deaerators are critical for maintaining system efficiency and longevity, reducing maintenance costs, and ensuring safe boiler operation.

Biomass energy harnesses organic material such as wood, crop residues, or waste to produce electricity or thermal energy via combustion, gasification, or anaerobic digestion. Wind (A), geothermal (C), and solar PV (D) use non-organic resources. For Certified Energy Managers, biomass represents a flexible renewable option, particularly in rural or industrial settings with abundant organic waste streams.