APPENDIX B –

MINIMUMBLOCKSIZES

FOR NODAL EXCHANGE CONTRACTS

The minimum sizes for Block Trades are as follows:

Nodal Exchange Contract Description MinimumBlock 

Size (Lots)

All power contracts (RT LMP, DA LMP, Energy, Energy plus 

Congestion) settling to peak or off-peak hours of the month and 

trading as an outright, intra-contract or inter-contract spread,

All RIN contracts,

Texas Compliance Solar Renewable Energy Certificate from CRS 

Listed Facilities Front Half,

Texas Compliance Solar Renewable Energy Certificate from CRS 

Listed Facilities Back Half,

Texas Compliance Renewable Energy Certificate from CRS Listed 

Facilities Front Half,

Texas Compliance Renewable Energy Certificate from CRS Listed 

Facilities Back Half,

M-RETS Renewable Energy Certificate from CRS Listed 

Wind Energy Facilities Front Half,

M-RETS Renewable Energy Certificate from CRS Listed 

Wind Energy Facilities Back Half,

NAR CRS Listed Wind REC Front Half, 

NAR CRS Listed Wind REC Back Half, 

NAR CRS Listed Solar REC Front Half, 

NAR CRS Listed Solar REC Back Half, 

WREGIS CRS Listed Wind REC Front Half, 

WREGIS CRS Listed Wind REC Back Half 

National CRS Listed Wind REC Front Half, 

National CRS Listed Wind REC Back Half

5

Henry Hub LD 2500 

Henry Hub Pen 2500 

Henry Hub LD 10K 

Henry Hub Pen 10K

25

25

50

15

CSAPR SO2/NOX Emission Allowances 4

California Carbon Allowances, 

California PCC 3 RECs,

Connecticut Compliance Class 2RECs, 

Connecticut Compliance Class 3RECs, 

District of Columbia Tier 1 RECs, 

District of Columbia Solar RECs, 

RGGI Carbon Allowances,

New Jersey Solar RECs,

Massachusetts Solar RECs, 

Massachusetts Solar RECs Carve Out II,

Massachusetts Compliance Class 2 RECs, 

Maine Class 1 RECs,

Maine Class 2 RECs,

10
Maryland Solar RECs, 

Maryland Tier 2 RECs,

New Hampshire Class 1 RECs, 

New Hampshire Class 3 RECs, 

Ohio Non-Solar RECs,

Ohio Solar RECs, 

PennsylvaniaSolar AECs, 

Rhode Island New RECs,

California Low Carbon Fuel Standard, 

Oregon Clean Fuels Program,

Washington Clean Fuels Program,

Massachusetts Alternative Energy Certificate, 

Pennsylvania Alternative Energy Certificate Tier II, 

Massachusetts Renewable Energy Certificate Class 2 WTE, 

New York Renewable Energy Certificates Tier 1

New Jersey Compliance Renewable Energy Certificate Class 2, 

Massachusetts CES-E Certificate,

Maine Renewable Energy Certificate Class 1A, 

California Carbon Offset 8,

California Carbon Offset 0, 

California Carbon Offset 0 DEBS,

Verified Emission Reduction Nature-Based, 

Verified Emission Reduction CORSIA-Eligible, 

Certified EmissionReductionCommitmentPeriod

2, Certified Emission Reduction 2013+,

Certified EmissionReduction2016+, 

Carbon Removal,

Global Emission Reduction, 

Renewable Natural Gas Certificate, 

Washington Carbon Allowances,

New Jersey/Pennsylvania Dual-Qualified Renewable Energy 

Certificate Class 2

10

Virginia Compliance RECs

PJM Quad-Qualified Class 1 RECs

20

PJM Tri-Qualified Class 1 RECs, 

Maryland Compliance Tier 1 RECs, 

Pennsylvania Compliance Tier 1 AECs, 

New Jersey Compliance Class 1 RECs, 

NEPOOL Dual-Qualified Class 1 RECs, 

NEPOOL Quad-Qualified Class 1 RECs, 

Connecticut Compliance Class 1 RECs,

Massachusetts ComplianceClass 1 RECs, 

Texas Compliance RECs

50

Effective 5/26/2023 8/11/2023