Investment in system-wide transmission projects has increased

Average annual transmission investment (3-year rolling, 2025 $) by approval year

(Please use a modern browser to see the interactive version of this visualization)

We show a 3-year rolling average of investments to smooth out fluctuations, as transmission investments vary year to year due to portfolio-based planning. ‘System-wide’ is defined differently in each region.
Data was only available for four RTOs.