Four companies, Amazon, Meta, Google, and Microsoft, bought nearly half of all corporate clean energy contracts globally in 2025. Meanwhile, everyone else pulled back, with overall volumes declining for the first time in eight years. What looks like a sustainability win is actually a story about market concentration, economic fragility, and what happens when the clean energy transition and the U.S. economy both depend on the same handful of companies making the same massive bets. In this discussion, we break down the data and explain why CIOs, energy leaders, and policymakers should be paying close attention.