$RID vs $TCAI: Weighing Established Smart Grid Exposure Against Emerging AI Infrastructure GRID is a passive ETF tracking the NASDAQ OMX Clean Edge Smart Grid Infrastructure Index, providing diversified exposure to global companies in smart grid, meters, networks, and energy storage with an expense ratio of 0.56%. TCAI is an actively managed ETF launched in August 2025, targeting AI infrastructure including data centers, energy, and enabling technology, with a higher expense ratio of 0.65% and fewer holdings (approximately 45).