Utilities ETF (XLU) versus alternative energy ETF (VPU) compared as AI data center boom drives competitive positioning in power supply.
The AI data-center power crunch has transformed utilities from bond proxies into growth stocks, with two funds now central to this trade: the Utilities Select Sector SPDR Fund (NYSEARCA:XLU) and the Vanguard Utilities Index Fund ETF (NYSEARCA:VPU). While they appear nearly identical on a screener, they make fundamentally different bets on who will capture the hyperscaler power boom. One concentrates on a handful of mega-cap operators with signed data-center deals, while the other spreads across the entire utility complex, including mid-caps and water utilities with minimal AI exposure.
XLU tracks a subset of S&P 500 utilities, holding roughly 30 names on a cap-weighted basis. NextEra Energy accounts for 13.59%, Constellation Energy for 6.11%, and Vistra for 3.36%, with the top five holdings representing 39.30% of assets. This concentrated positioning is a deliberate bet that the largest generators—particularly the nuclear-heavy independents signing hyperscaler contracts—will continue repricing higher as AI load forecasts rise.
VPU tracks the MSCI US Investable Market Utilities 25/50 Index, which includes mid- and small-cap utilities alongside large caps. With more than 65 holdings, the fund dilutes exposure to AI-focused power names. Constellation and Vistra still rank near the top, but with meaningfully smaller weightings because the index extends into regulated water utilities, smaller gas distributors, and regional electric operators without data-center pipelines. VPU represents a bet on the utility sector broadly, while XLU concentrates on its largest players.
Concentration has paid, though modestly. From January 3, 2023 through July 6, 2026, XLU returned 42.75% versus VPU's 42.05%. Over five years, the gap widens slightly, with XLU up 62.63% compared to VPU's 60.64%. Year to date in 2026, XLU leads with 7.53% gains against VPU's 7.11%.
XLU's overweight to Constellation and Vistra during the 2023-2025 AI-utility rally added return, but VPU's broader roster of regulated utilities kept pace because those names also re-rated on the same theme. The concentration advantage is real, though not enormous.
The one-basis-point expense difference is trivial. What matters is that XLU's construction rules force it to concentrate in the exact names driving the AI-power narrative, while VPU's methodology deliberately spreads exposure into utilities untouched by the theme.
For investors specifically betting on the AI data-center power buildout, XLU offers cleaner exposure. Its combined 9.47% weighting in Constellation and Vistra, plus a heavy NextEra position, provides direct access to generators signing hyperscaler contracts and pursuing nuclear restarts. VPU is the better choice for investors seeking defensive utility exposure without concentrating on independent power producers. Its water and mid-cap holdings dampen both upside and downside from the AI theme.
The calculus shifts if regulatory or grid-connection setbacks specifically punish independent power producers. In that scenario, VPU's diversification into regulated utilities would cushion drawdowns that XLU's concentration would amplify.