Geographic location   The James Bay territory   Access infrastructures   The Robert-Bourassa hydroelectric development   The dam   The dikes   The spillway   The spillway deck   The reservoir   The intake and the headrace   The underground facilities   The machine hall   The scrollcase   The generating units   The surge chamber   The tailrace tunnels   The control room   Radisson village   Radisson substation   The James Bay transmission system

The surge chamber, which runs parallel to the machine hall, receives the water as it leaves the turbines and distributes it among the four tailrace tunnels. The surge chamber's job is to dampen excess variations in pressure that can occur during unit startup, sudden shutdowns, or changes in flow rate. This cavern is 450 m long, 45 m high and 14 m wide at its base.