Barry Salter wrote:

The uprating of the power supply during the last closure was to enable
Class 465 "Networker" EMUs to run through, but it needs further uprating
for the new, more powerful, Electrostars that will be running the
service, and an increase to 16 trains per hour on the core route.

I think you actually meant to write "more power hungry" rather than
more powerful. Efficiency doesn't seem to have been in the brief when
they were designed.

B2003