Power Plant's Cooling Pump is the second map in Area 9800, one of the campaigns introduced in Alien Swarm: Reactive Drop.
- StartUp Backup Generator
Seems like the power was cut out, this is not part of standard isolation procedure. Whatever the cause you'll need to start the backup generator which will power up doors.
- Access the inner facility
A bunch of security doors separates your team from the inner facility where the rest of your objectives lay. Deal with them.
- Start up Cooling Pump
You're gonna have to restart the main generators now. Those need water cooling.
- Head towards the fuel pump
Next is the fuel pump for the generator.