One petawatt-hour (1 PWh) is a unit of energy equivalent to one quadrillion watt-hours. It represents the amount of energy consumed or produced at a rate of one petawatt over the course of one hour. This measurement is often used in large-scale energy production and consumption contexts, such as in the analysis of national energy grids or global energy usage. To put it in perspective, 1 PWh is enough to power approximately 33 billion 30-watt light bulbs for one hour. This vast amount of energy is relevant in discussions about renewable energy sources like solar power and wind energy, as well as in the context of climate change and energy sustainability.