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

The NYISO is reserving hours beginning 00:00, 05:00 - 06:00, 08:00 - 13:00
and 16:00 - 23:00 in the May 18, 2001 Real-Time Market as well as the
following hours per ECA20001006B to verify prices:

PJM: 00:00 - 04:00
OH:  00:00 - 01:00
HQ:  00:00 - 01:00
NE:  00:00 - 01:00

Prices in the May 19, 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