Notice to Members
Notice No. 257
05/16/2008
Outright (Scan) Margin Rate Changes for Financially Settled Electricity Contracts
Effective Date: Monday, May 19, 2008 (close of business)

Futures Contract:
NYISO Zone G – Peak (KG), NYISO Zone J – Peak (KJ), Northern Illinois Hub – Peak (UM), AEP-Dayton Hub – Peak (VM), Cinergy Hub LMP – Peak (EM), ISO New England Internal Hub – Peak (NI), NYISO Zone G – Off Peak (KH), NYISO Zone J – Off Peak (KK), ISO New England Internal Hub – Off Peak (KI)
Contract Months: Tier 1 Only


NYMEX Division Outright (Scan) Margins on NYISO Zone G – Peak (KG)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $2,500 $2,500 $2,750 $2,750 $3,375 $3,375
Tier 2: 2nd - 6th Nearby $3,000 $3,000 $3,300 $3,300 $4,050 $4,050
Tier 3: 7th - 11th Nearby $3,000 $2,500 $3,300 $2,750 $4,050 $3,375
Tier 4: Greater than 11th Nearby $3,000 $2,000 $3,300 $2,200 $4,050 $2,700


NYMEX Division Outright (Scan) Margins on NYISO Zone J – Peak (KJ)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $3,000 $3,000 $3,300 $3,300 $4,050 $4,050
Tier 2: 2nd - 6th Nearby $3,000 $3,000 $3,300 $3,300 $4,050 $4,050
Tier 3: 7th - 11th Nearby $3,000 $2,500 $3,300 $2,750 $4,050 $3,375
Tier 4: Greater than 11th Nearby $3,000 $2,000 $3,300 $2,200 $4,050 $2,700


NYMEX Division Outright (Scan) Margins on Northern Illinois Hub – Peak (UM)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $10,000 $9,000 $11,000 $9,900 $13,500 $12,150
Tier 2: 2nd - 6th Nearby $6,000 $6,000 $6,600 $6,600 $8,100 $8,100
Tier 3: 7th - 11th Nearby $5,000 $5,000 $5,500 $5,500 $6,750 $6,750
Tier 4: Greater than 11th Nearby $4,000 $4,000 $4,400 $4,400 $5,400 $5,400


NYMEX Division Outright (Scan) Margins on AEP-Dayton Hub – Peak (VM)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $10,000 $9,000 $11,000 $9,900 $13,500 $12,150
Tier 2: 2nd - 6th Nearby $6,000 $6,000 $6,600 $6,600 $8,100 $8,100
Tier 3: 7th - 11th Nearby $5,000 $5,000 $5,500 $5,500 $6,750 $6,750
Tier 4: Greater than 11th Nearby $4,000 $4,000 $4,400 $4,400 $5,400 $5,400


NYMEX Division Outright (Scan) Margins on Cinergy Hub LMP – Peak (EM)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $2,500 $2,500 $2,750 $2,750 $3,375 $3,375
Tier 2: 2nd - 6th Nearby $5,000 $4,500 $5,500 $4,950 $6,750 $6,075
Tier 3: 7th - 11th Nearby $6,500 $5,500 $7,150 $6,050 $8,775 $7,425
Tier 4: Greater than 11th Nearby $5,500 $4,500 $6,050 $4,950 $7,425 $6,075


NYMEX Division Outright (Scan) Margins on ISO New England Internal Hub – Peak (NI)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $7,000 $6,000 $7,700 $6,600 $9,450 $8,100
Tier 2: 2nd - 6th Nearby $8,000 $7,000 $8,800 $7,700 $10,800 $9,450
Tier 3: 7th - 11th Nearby $9,000 $8,000 $9,900 $8,800 $12,150 $10,800
Tier 4: Greater than 11th Nearby $6,000 $5,000 $6,600 $5,500 $8,100 $6,750


NYMEX Division Outright (Scan) Margins on NYISO Zone G – Off Peak (KH)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $5,000 $4,500 $5,500 $4,950 $6,750 $6,075
Tier 2: 2nd - 6th Nearby $3,500 $3,500 $3,850 $3,850 $4,725 $4,725
Tier 3: 7th - 11th Nearby $4,500 $4,500 $4,950 $4,950 $6,075 $6,075
Tier 4: Greater than 11th Nearby $4,000 $4,000 $4,400 $4,400 $5,400 $5,400


NYMEX Division Outright (Scan) Margins on NYISO Zone J – Off Peak (KK)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $5,000 $4,500 $5,500 $4,950 $6,750 $6,075
Tier 2: 2nd - 6th Nearby $3,500 $3,500 $3,850 $3,850 $4,725 $4,725
Tier 3: 7th - 11th Nearby $3,500 $3,500 $3,850 $3,850 $4,725 $4,725
Tier 4: Greater than 11th Nearby $3,000 $3,000 $3,300 $3,300 $4,050 $4,050


NYMEX Division Outright (Scan) Margins on ISO New England Internal Hub – Off Peak (KI)
 
 
Clearing Member / Maintenance Margin
Member Customer Initial Margin
Non-Member Customer Initial Margin
 
New
Old
New
Old
New
Old
Tier 1: 1st Nearby $5,000 $4,500 $5,500 $4,950 $6,750 $6,075
Tier 2: 2nd - 6th Nearby $3,500 $3,500 $3,850 $3,850 $4,725 $4,725
Tier 3: 7th - 11th Nearby $4,500 $4,500 $4,950 $4,950 $6,075 $6,075
Tier 4: Greater than 11th Nearby $4,000 $4,000 $4,400 $4,400 $5,400 $5,400



This notice supersedes all previous notices regarding margin rates for the Electricity Futures contracts listed above.
Should you have any questions or require any further information, please contact exchangeinfo@nymex.com