Growing waves of wind turbine and solar panel retirements starting in the 2030s will expose the massive physical nightmare of continuous renewal and replacement. Cumulative waste is projected to reach 78 million tonnes for solar panels and up to 200 million tonnes for wind turbines by mid-century. Because wind and solar have low capacity factors and finite lifespans (15–25 years), generating firm power requires significant overbuilding, backed by battery storage, transmission and costly backup energy. Replacing this fleet on a continuous cycle guarantees an endless demand for raw materials, mining, and manufacturing. It creates a replacement loop that will multiply mining throughput for steel, copper, aluminum, silicon, silver, rare earths and composite blade materials. Expanding to multi-terawatt scales will exacerbate existing critical mineral shortages. Closed-loop recycling at this scale remains largely aspirational as blade composites are notoriously difficult to recycle, with large volumes historically sent to landfills. Decommissioning, and recycling infrastructure lag far behind deployment, most likely leaving behind significant unfunded liabilities. Ultimately, these challenges will become physical, logistical and economic, reflecting the massive reality behind the ambition of the buildout.