March 2026 real-time TB4 spreads rose year-over-year across every NYISO zone, with Capital leading at $267/MW-day

Average daily TB4 spread in March 2025/26 ($/MW-day)

Day-Ahead

Real-Time

Source: NYISO, Modo Energy

Note: TB4 spread calculated as the difference between the 4 highest and 4 lowest price hours in each day.

MODOENERGY