CGoering@nyiso.com writes to the NYISO_TECH_EXCHANGE Discussion List:

The NYISO is reserving hours beginning 02:00 and 03:00 in the August 1,
2001 Real-Time Market as well as the following hours per ECA20010608B to
verify prices:

HQ:  5:00 - 7:00, 9:00, 10:00, 16:00 - 18:00, 23:00
NE:  5:00 - 7:00, 9:00, 17:00, 23:00
OH:  5:00 - 7:00, 9:00, 17:00, 23:00
PJM: 5:00 - 7:00, 9:00, 17:00, 23:00
In addition, the NYISO is reserving all hours in the August 2, 2001
Day-Ahead Market.

This e-mail information is a copy of the official posting which can be
found at the following address on our website:
http://mis.nyiso.com/public/htm/OperMessages/CurrentOperMessages.htm#mm