I'm curios as to why these much more energy efficient chips require a significant upgrade of the power brick, now at 140W that's more than 40W higher than the I

I'm curios as to why these much more energy efficient chips require a significant upgrade of the power brick, now at 140W that's more than 40W higher than the Intel chips (and only for the 16" model). Not a big deal, but can't see what would require the massive upgrade (and I'm a bit frustrated that all my cables are only rated for 100W)