Notice to Members

Notice No. 371
08/31/2005

Margin Rates Changes for Natural Gas Swing Swap Contracts

EFFECTIVE DATE: Wednesday, August 31, 2005 (close of business)

FUTURES CONTRACTS:

Dominion Swing Swap (SH), Kern River Swing Swap (SR), PG&E City Gate Swing Swap (SK), San Juan Swing Swap (SJ), SoCal Swing Swap (SF), Sumas Swing Swap (SU), TETCO M-3 Swing Swap (SX), Transco Zone 6 Swing Swap (ST), Chicago City Gate Swing Swap (SS), El Paso/Permian Swing Swap (SL), Houston Ship Channel Swing Swap (SM), Panhandle Swing Swap (SV), Waha Swing Swap (SY)

CONTRACT MONTHS: All Contracts

NYMEX Division Outright (Scan) Margin Rates for Natural Gas Swing Swaps Contracts

All Nearby Contracts	Clearing Member / Maintenance Margin		Member Customer Initial Margin		Non-Member Customer Initial Margin
	*New*	Old	*New*	Old	*New*	Old
Dominion Swing Swap (SH)	$2,125	$1,700	$2,338	$1,870	$2,869	$2,295
Kern River Swing Swap (SR)	$2,625	$2,100	$2,888	$2,310	$3,544	$2,835
PG&E City Gate Swing Swap (SK)	$2,625	$2,100	$2,888	$2,310	$3,544	$2,835
San Juan Swing Swap (SJ)	$3,375	$2,700	$3,713	$2,970	$4,556	$3,645
SoCal Swing Swap (SF)	$3,625	$2,900	$3,988	$3,190	$4,894	$3,915
Sumas Swing Swap (SU)	$2,375	$1,900	$2,613	$2,090	$3,206	$2,565
TETCO M-3 Swing Swap (SX)	$2,250	$1,800	$2,475	$1,980	$3,038	$2,430
Transco Zone 6 Swing Swap (ST)	$2,250	$1,800	$2,475	$1,980	$3,038	$2,430
Chicago City Gate Swing Swap (SS)	$2,969	$2,375	$3,266	$2,613	$4,008	$3,206
El Paso Permian Swing Swap (SL)	$2,969	$2,375	$3,266	$2,613	$4,008	$3,206
Houston Ship Channel Swing Swap (SM)	$2,969	$2,375	$3,266	$2,613	$4,008	$3,206
Panhandle Swing Swap (SV)	$2,969	$2,375	$3,266	$2,613	$4,008	$3,206
Waha Swing Swap (SY)	$2,969	$2,375	$3,266	$2,613	$4,008	$3,206

Should you have any questions or require any further information, please contact exchangeinfo@nymex.com