This under-the-radar powerhouse has soared of late thanks to some big trends.It's rare for a well-established energy stock to absolutely pulverize the S&P 500's returns, but that's exactly what Texas-based electric company Vistra (VST -0.22%) is doing. The stock is up 47.5% so far in 2025, beating the S&P's 12.8% return by nearly 35 percentage points.And Vistra doesn't show any signs of stopping, thanks to two big trends that both happen to be working in its favor. Here's why Vistra is likely to continue to ...