Rebound Effect (Energy Economics)

The rebound effect in energy economics is the partial or full offset of energy savings from efficiency improvements that occurs because the improvement lowers the effective price of energy services. Lower effective price increases demand, recovering some of the engineering-estimated savings. Economists typically distinguish three components. The direct rebound effect occurs in the same service: an efficient furnace makes heating cheaper, so households set thermostats higher or heat more rooms. The indirect rebound effect occurs when money saved on one service is spent on others that consume energy — a household saving on lighting may take an extra flight. Economy-wide rebound effects (sometimes called macroeconomic or general-equilibrium rebound) capture longer-run structural changes: lower input costs make energy-intensive industries more competitive, shifting the composition of output. Empirical estimates of rebound vary widely by sector. Direct rebound for household energy services in developed economies is commonly estimated in the 10-30% range, meaning roughly two thirds of engineering savings are realized. Transport rebound estimates are higher, and for productive uses of energy in industry, full or backfire rebound (>100%) is plausible. When economy-wide rebound exceeds 100%, the situation matches the original Jevons Paradox, generalized by Harry Saunders in 1992 as the Khazzoom-Brookes postulate. Rebound is contested in policy debates. Critics of efficiency mandates argue rebound erodes their climate value; defenders counter that even partial rebound leaves substantial net savings and that rebound is welfare-positive — people are consuming more useful services, not just more energy. The mainstream position is that rebound is real, sector-specific, and rarely zero or 100%, but matters most when efficiency improvements are large and unlock new use cases rather than just cheapen existing ones.