Professional engineering and contracting companies EMCOR Group and Quanta Services reported strong second-quarter 2026 results, indicating robust demand for artificial intelligence (AI) infrastructure construction. EMCOR's Q2 revenue increased by 19.8% year-over-year to $5.15 billion, significantly exceeding analyst expectations; diluted earnings per share reached $9.06, surpassing estimates by 25.3%; and remaining performance obligations (backlog) grew by 44% year-over-year to a record $17.14 billion. Boosted by these results, EMCOR's stock price jumped 18%. Quanta Services' Q2 revenue increased by 41.1% year-over-year to $9.56 billion, exceeding expectations by 12.1%; adjusted earnings per share grew by 71% year-over-year to $4.24, surpassing estimates by approximately 29%. Quanta's stock price rose by about 14% after the earnings release. Both companies raised their full-year guidance, reflecting the strong growth momentum in the AI power and grid upgrade cycle.