耗资 is a formal verb-object compound meaning 'to spend a large sum of money' on a project, construction, or event. It's typically used in news, reports, or official contexts — not in casual conversation about everyday expenses. Because it's a separable verb (离合词), you can insert measure words or modifiers between 耗 and 资, like 耗巨资 ('spend a huge amount of money') or 耗了多少资 ('how much money was spent').