Megavolt‑ampere reactive (MVAR) is the standard unit for measuring reactive power in alternating‑current (AC) systems, representing one million volt‑ampere reactive and symbolized as MVAR. Unlike real power (measured in megawatts), MVAR quantifies the energy that oscillates between inductive and capacitive components without performing useful work, making it essential for assessing power factor, sizing transformers, and designing compensation equipment. Engineers and utilities use MVAR calculations to optimize grid stability, reduce losses, and ensure efficient load balancing in industrial, commercial, and renewable‑energy applications. Understanding and managing megavolt‑ampere reactive values is therefore critical for reliable power delivery, cost‑effective operation, and compliance with electrical standards worldwide.