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National Grid
Distributed Generation Seminar
Hopedale, MA
July 25, 2019
The Interconnection Process, Access Roads, and
Environmental Permitting
The information summarized in this Seminar for the convenience of customers is current as of April 18, 2019 and neither the slides nor related
recording should be relied on for a particular project. Customers are responsible for ensuring that they comply with all distributed generation
rules and regulations, including the distributed generation tariff, for their particular project.
Agenda
Welcome, Opening Remarks – Will Kern (10 min)
Interconnection Process (1 hour, 20 min)
Simplified Process – Margaret Campbell
Questions
Expedited Process – Eric Munzert
Questions
Standard Process – Priscilla Ndikwani and Andrea Agra
Questions
Access Roads– Will Kern (20 min)
Environmental Permitting– Laura Ernst and Lauren Peloquin (30 min)
Questions
Customer Meet and Greet with CEI Job Owners (30 min)
2
Safety Moment
Access Roads
When you are at an access road near a DG site,
be sure to know what the names of the streets are
near the sites
3
Simplified Criteria
UL Listed (1741 SA), inverter based systems with power ratings of
15kW or less on a single phase service on a radial feed
UL Listed (1741 SA), inverter based systems with power ratings of
25kW or less on a three phase service on a radial feed.
The Simplified Process does not apply for:
Non-listed inverters or other generators (induction / synchronous /
asynchronous)
Aggregate generation capacity of listed inverters that exceed the above-
mentioned limits
5
Interconnection Process Steps
Application
Simplified
Conditional Approval (to construct DG system)
Witness Test (completion package)
Authorization to Interconnect
https://www.nationalgridus.com/masselectric/home/energyeff/4_interconnection-process.asp
6
Simplified Review Path
7
Simplified Process
Eligible Facilities Listed Small Inverter
Acknowledge Receipt of Application (3 days)
Review Application for Completeness 10 days
Complete Review of All Screens 15-20 days
Complete Supplemental Review (if needed) N/A
Complete Standard Process Initial Review N/A
Send Follow-on Studies Cost/Agreement N/A
Complete Impact Study (if needed) N/A
Complete Detailed Study (if needed) N/A
Send Executable AgreementDone. The agreement is part of the application.
Total Maximum Days 25 days (30 in the case of failure of Screen #5)
Construction Schedule Varied
Witness Test Within 10 days from receipt of the Certificate of Completion or by mutual agreement
Exception Policy for sub meter(s) location
if grouping of meters is not feasible
There are select cases in which grouping of the Company meters may not be feasible, such
as when a required DER sub-meter is:
located beyond the service equipment and the location of the service meter is remote
from the location of the DER point of interconnection to the premise electric system
connected to a supply side tap of a service where the existing meter is remote from the
structure and the tap location is at the structure.
The associated DER isolation disconnect (see ESB 756), when required, shall be located
adjacent to the sub-meter.
Labeling requirements for DER devices and utility meters shall apply in accordance with
ESB 756.
All other sections of ESB 750 section 7.0 apply as appropriate.
One line must include the distance between the service meter and the sub-meter
https://www9.nationalgridus.com/non_html/CM7512%20Meter%20Location.pdf
8
Expedited Criteria
Single phase customers with listed single-phase inverter based
systems with power ratings of >15 kW on a radial feed
Three phase customers with listed three-phase inverter based
systems with power ratings of >25kW on a radial feed
Any project that did not pass the Simplified process screens
Non-simplified projects that do not require an impact study
10
Interconnection Process Steps
Pre-Application (if 500 kW or greater)
Application
Expedited
Engineering Review
Supplemental Review
Conditional Approval (to construct DG system)
National Grid Construction
Witness Test (where applicable)
Completion Document Review and Meter Set
Authorization to Interconnect
https://www.nationalgridus.com/masselectric/home/energyeff/4_interconnection-process.asp
11
Expedited Review Path
If any screens are not passed, the
Company may require a
Supplemental Review
Agreement before providing an
Interconnection Service
Agreement
Key threshold: if aggregate
generation is less than 67%
of minimum load on the
feeder. Other screens review
voltage quality, reliability and
safety to reduce the potential
need for impact studies.
Relay control system must be well
defined to make supplemental
review easier.
Expedited
Eligible Facilities Listed Inverter DG
Acknowledge Receipt of Application(3 days)
Review Application for Completeness10 days
Complete Review of All Screens25 days
Complete Supplemental Review (if needed)20 days or Standard Process
Send Executable Agreement10 days
Total Maximum Days 45/65 days
Construction ScheduleVaried
Notice/ Witness TestWithin 10 days of receiving Certificate of
Completion or by mutual agreement
12
Common Errors in Completion
Documents
For most expedited applications a “Commissioning Memo”
on a company letterhead is provided in lieu of Witness Test.
Commissioning test should consist of the following:
1. 2 second shutdown when disconnect open test.
2. 5 minutes before restart when disconnect is closed test.
3. Confirm system matches As-built (include most recent revision
date of as built provided)
4. List the inverter relay frequency (Hz) and trip time settings.
13
Common Errors in Completion
Documents
As Built: Must be PE stamped, and signed/ dated by person
that performed the commissioning test. (Signature date
should match date of test.)
Pictures: Meter picture should show permanent plaque
(visible at eye level) that includes a warning about generator
installed.
Pictures: If the AC utility disconnect switch is not grouped
with and adjacent to the utility revenue meter, then a
permanent plaque (visible at eye level) that clearly identifies
the location of the AC utility disconnect is required.
14
Common Errors in Completion
Documents
Pictures: Projects participating in the SMART program
require additional plaques that identify the different meters.
Plaques shall read as follows.
Utility Service Meter
Utility PV Generation Meter
Utility Storage Meter
Pictures: If the PCC is at a pad mounted service transformer
a permanent plaque (visible at eye level located on the right
door of the transformer) that includes a warning about the
generator is required.
15
Common Errors in Completion
Documents
Evidence of insurance is required for all projects > 60kW in
MA and >50kW in RI. Refer to the ISA and Interconnection
Tariff for insurance requirements.
Qualifying Facility documents
Schedule A (P-Rate) required for all QF projects.
W9 (Only for projects >60kW)
ACH (Only for projects >60kW)
Supplier Enrollment Form (Only for projects >60kW)
16
Metering Reminder
Projects greater than 60kW in MA and greater than 25kW in
RI require interval metering (Wireless or phone line).
National Grid needs a 4G wireless signal test on a Verizon
network in order to provide wireless metering.
Phone lines must be dedicated and terminated at the meter
location. Line must be 100% copper. Fiber lines will not
communicate properly.
These meters are long lead time items and prep time can be
6-8 weeks, so it is important to work through this with your
job owner well in advance of when you intend to seek
Authority to Interconnect.
17
Pre-Application
Necessary for all cases 500 kW or greater
Pre-application report returned to customer with in 10 Business Days
Customer provides contact information, facility location, generation type
including size, phase and service configuration.
Customer also provides information on existing service/new service or
upgrade, stand alone or site max and min electric loads if available.
National Grid provides circuit information including agg DG (connected
and not connected) on circuit , phase, network/radial and potential
system constraints
19
Application
Application
Required for all projects
Application review to be completed with 10 Business Days
Application Review
Application fee, Billing account, system size, assets , application roles
Account location, incentive, program, meter fee
Application form, site plan, line diagram, tech sheet, legal document
Additional information for battery storage, Curtailment letter,
Anti-Islanding Letter (> 500kW), Prove Site Control
20
Screening
Required for expedited and standard projects
Screening review to be completed with 25 Business Days
Is PCC on a radial/Network system?
Is facility using UL1741 listed or UL1741 SA certified inverter
Is the Facility power rating< 15kW Single-phase or <25kW three phase?
Is the Service Configuration Screen Met?
Risk of Islanding screen met?
Substation back-feed screen met?
If any screens are not passed, the Company may require a Supplemental Review
Agreement or Impact study before providing an Interconnection Service Agreement
Key threshold: if aggregate generation is less than 67% of minimum load on the feeder.
Other screens review voltage quality, reliability and safety to reduce the potential need
for impact studies.
21
Standard Criteria
Applies to:
Projects that require Distribution System Impact Study (DSIS)
Large-scale DG projects
Generally greater than 500 kW but project specific
DG projects requiring system modifications at the substation level
Non-listed inverters or generators other than PV:
Induction, Synchronous, Asynchronous
Most CHP systems
All projects that do not qualify for the Simplified or Expedited process
22
Interconnection Process Steps
Pre-Application
Note that we now include notice of ISO-NE approval required for all applications that are
greater than 1MW in size. This approval can be in response to Generator Notification Form
(PP5-1) or Proposed Plan Application (PPA) submittals. These approvals and associated
processes will introduce delays into the Distributed Generation Interconnection Process.
Application
Standard
Engineering Review
Impact Study/Detailed Study
Conditional Approval (to construct DG system)
National Grid Construction
Witness Test
Authorization to Interconnect
https://www.nationalgridus.com/masselectric/home/energyeff/4_interconnection-process.asp
23
Standard Review Path
Standard
Eligible Facilities Any DG
Acknowledge Receipt of Application (3 days)
Review Application for Completeness 10 days
Complete Standard Process Initial Review 20 days
Send Impact Study Agreement 5 days
Complete Impact Study55 – 60 days, or by mutual agreement depending on complexity
Complete Detailed Study (if needed)30 – 60 days, or by mutual agreement depending on complexity
Send Executable Agreement (ISA) 15 days
Total Maximum Days 135/160 days (200 days for Standard Complex)
Construction Schedule Varied
Witness Test
10 days from the Company’s approval of WT procedures or by
mutual agreement
24
Standard Review Path
25
Impact Study will determine the level of impact on the Company’s EPS, and the required system
modifications
Impact and Detailed Study (if applicable) will determine System Modifications required and cost
(Risk of Islanding)
ISO-NE Generator Notification Process will be required for applications that are greater than and
equal to 1MW but less than 5MW (i.e. PP5-1 or GNF), and a Proposed Plan Application (PPA)
along with supporting Transmission System Impact Study (TSIS) will be required for applications
5MW or greater in size, single or potentially in aggregate. Size of project based on nameplate
rating of system.
These requirements will add time to the DG Interconnection Process. The DSIS will be placed
on hold until the ISO-NE approval or determination is known, likely at a point during the study
process.
Interconnection Service Agreement (ISA) provided after study completed or an Early ISA could
be requested if Detailed Study is required
If substation modifications required, Company has 60 BD for study (MDPU 1320 – pg. 50) or by
mutual agreement if estimated construction cost greater than $1 million.
Purpose & Place within
Construction
Access roads are required for safe access to National Grid
equipment on customer’s property
Indicated in Site Plan, built before Design completed
All town requirements will also need to be adhered to
27
Construction Standards
Existing and proposed Access road(s) including, at a minimum, the
access road shall be at minimum width 18ft, with a gradient of at
most 8%.
Provide turnaround area that enables vehicles to exit without
backing up where possible.
Road must be accessible by NG bucket trucks at all times.
Access roads must be made of material that will not allow trucks to
be interfered with by mud, snow, or other environmental factors.
If gate needs to be locked, will require it to be “double locked”
using at utility-owned lock.
Vegetation along road should be maintained to allow access to
utility-owned poles and equipment.
28
Interconnection questions can be directed to –
Distributed.Generation@nationalgrid.com
Case-specific questions can be directed to your respective CEI
Job Owner
Questions
Appendix: Summary of Resources,
Documents, and Links
Distributed Generation Website –
https://www9.nationalgridus.com/masselectric/home/energyeff/distribut
ed_generation.asp
Interconnection Process Resources –
https://www9.nationalgridus.com/masselectric/home/energyeff/4_interc
onnection-process.asp
38
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