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

The NYISO is reserving hours beginning 01:00 - 04:00, 09:00, and 23:00 in
the May 21, 2001 Real-Time Market as well as the following hours per
ECA20001006B to verify prices:

PJM:  04:00 - 06:00, 11:00
OH:   11:00
HQ:   04:00, 11:00
NE:   11:00, 22:00

Prices in the May 22, 2001 Day-Ahead Market are correct.

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