NG - National Grid (MA)

Net metering & export

Net Metering Allowed

1

NEM Type

Monthly

TOU Utility

0

Post Solar Billing Method

Net Metering

Solar Export Type

N/A

Net Excess Generation Notes

• Excess generation at the end of each month is credited at the applicable retail electricity rate and rolled forward to future bills as a dollar credit. This credit rolls forward indefinitely to future bills but cannot be "cashed out".

Rebates Offered

1

Deregulated

1

Allows Standby

1

Interconnection & taps

Approval Req To Install

Yes

Interconnection Level

3

Supply Side Taps Allowed

1

Line Taps Allowed

1

Load Taps Allowed

1

Tap Criteria

• Cannot be in same compartment as utility meter.
• (2) AC disconnects are required. Inv > Non-fused Disco (outside) > Fused Disco (inside, if necessary) > POI

Automatic Transformer Upgrade Size

0

Meter Aggregation Allowed

1

System size & offset

System Size Restrictions

25

System Size Restriction Type

AC kW

System Size Battery Included

0

System Size Includes Existing Systems

0

Offset Type

No Restrictions

Offset Value

0

Offset Calculation Period

0

Industry Standard Watts Sqft

2

Utility Specific Adjustments

Please keep system size under 15 kW AC whenever possible.

For example:

• Please use mix of 7.6KVA and 5.7KVA to be under 15KW AC rather than using two 7.6KVAs. This will avoid Level 2 application and reduce approval times.

Curtailment Requirements

• National Grid allows system curtailment to avoid transformer upgrades and group studies
• Approved curtailment systems: Tesla Gateway, Enphase IQ, and Generac PWRcell
• Update all documents to show the system curtailed to 15 kW AC export
• Add a label showing aggregate AC kW/kVA ratings
• Show both total system size and curtailed system size
• Show internal DB protective device settings for inverters (see Tables 7.6.11.1-1 & 7.6.11.1-2, Page 33 in ESB 756)
• Provide a curtailment letter on manufacturer letterhead if the system is larger than the proposed export, including the model number of the Smart Hub/Gateway and the proposed system output (curtailed value)

Inverter Oversize Restrictions

1

System Size Justification

Load Justification

System Offset Notes

Metering & disconnect

Production Meter Required

Situational

Production Meter Criteria

Production Meter (SMART meter)

• Required for: Cash, Loan, Aura, Aura+
• Not required for: Lease projects
• Wire inverter on bottom side and utility on top side
• Only 1 production meter per project
• Second meter allowed only if 12 months have passed since existing system PTO

Production Meter Position

Inv-Disco-PM-POI

Production Meter Labeling

Production Meter

AC Disconnect Required

Yes

AC Disconnect Labeling

Accessible and Lockable AC Disconnect

Meter Spot Required

0

Meter Spot Process

• Some AHJs do not allow PV and MPU on a single utility work order #. Please request separate work order #s for each type of work.

Allowed Meter Adapter

None

Plans & docs

Electric Service Reqs

• Meter relocation is required if the utility meter is located indoors or inside any cabinet
• Single Meter - Center of meter must be between 30 and 60 inches
• Multi Meter - Center of meter must be between 36 and 60 inches

Placards

• Unit designation labels are required for the meter sockets at the premise (Example; Unit 1, Apt 1, etc)

Electrical Stamp Required

1

Equipment Approvals

Other

Meter Num Req SLD 3LD

0

ESID Num Req SLD 3LD

0

Site Plan Notes

Label Page Notes

Cover Page Notes

Electrical Diagram Notes

Battery [STORAGE CHARGING CAPABILITY: GENERATION ONLY STORAGE DISCHARGING CHARACTERISTICS: ON-SITE LOAD ONLY]

Website

link

Phone

(800) 322-3223

Other details

Restrict Inspection

1

Revision Required

1

Mod Swap Requires Planset

1

Address ID

2231602

Express Planset Eligible

Yes