We had just such a requirement a few weeks back. Our IBM CE recommended the 
following:

Before the power is going to be switched off: 
Shutdown systems 
Deactivate Lpars 
Deactivate CPC(wait for the CEC to power off)CPC Icon now Black 
Shut down Alt SE 
Shut down Primary SE(wait for both SE to shutdown) 
Shut Down HMC's affected by the power down. 
EPO Off he CPU frame using the Red switch. 

Power Restored 
Power on the HMC's 
EPO on, the cpu frame. 
Wait for the the CPC icon appear on the HMC . 
>From this point it will depend how the Customer has set up the Activation 
>Profiles or Manually power up... 
Manual power up. 
Power on Icon 
POR icon(check IOCDS is correct) 
Activate Lpars 
IPL or Activate and select the correct  profile(set up by the Customer)  

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of 
Matan Cohen
Sent: 17 June 2010 14:34
To: [email protected]
Subject: Re: taking down the machine - z9 series

IBM told me not to shutdown the SE.
IBM saying to perform deactivation and then CPC shutdown.

On Thu, Jun 17, 2010 at 3:54 PM, Mark Pace <[email protected]> wrote:

> SE = System Element.  The laptops within the z9.
>
> I would also shutdown the HMC  (Hardware Management Console).
>
>
> On Thu, Jun 17, 2010 at 8:44 AM, Matan Cohen <[email protected]
> >wrote:
>
> > R.S wrote "We shutdown SE" SE  stand for?
> > I did this sort of shutdown at diffrent Data center the time 
> > elctricity power cut is schedule from advance.
> > in the past I  remeber i was told never to cut power using the 
> > emergency switch ( i don't know the reason for that but it was said by a 
> > wise man).
> >
> > tom- i do want to perform a control power cut. i asked on the best 
> > way to perform this for the Z machine On Thu, Jun 17, 2010 at 3:28 
> > PM, R.S. <[email protected]
> > >wrote:
> >
> > > Matan Cohen pisze:
> > >
> > >  Hi,
> > >> When the situation force you to taking down the machine (due to 
> > >> Electricity power cut) , after taking down the lpars.
> > >> do you perform anything else beside deactivation of the CPC ?
> > >> i met a diffrent opinion in this matter .
> > >>
> > >
> > > Yes, we do. We shutdown SE and then cut the power using emergency
> switch.
> > > Electricity works could mean several up-down sequences which are not
> good
> > > for any machine.
> > >
> > > --
> > > Radoslaw Skorupka
> > > Lodz, Poland
> > >
> > >
> > > --
> > > BRE Bank SA
> > > ul. Senatorska 18
> > > 00-950 Warszawa
> > > www.brebank.pl
> > >
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> > >
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> >
> > --
> > best regards,
> > matan cohen
> > MF System Administrator.
> >
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>
>
> --
> Mark Pace
> Mainline Information Systems
> 1700 Summit Lake Drive
> Tallahassee, FL. 32317
>
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-- 
best regards,
matan cohen
MF System Administrator.

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