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Seattle City Light

Washington Utility Interconnection & net metering rules
Net Metering Allowed1
NEM TypeMonthly
Line Taps Allowed1
Load Taps Allowed1
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
1
NEM Type
Monthly
TOU Utility
0
Post Solar Billing Method
Net Metering
Net Excess Generation Notes

If the electricity generated by the Customer exceeds electricity consumed by the Customer and is distributed back to the Utility during the billing period, then the Customer shall be credited for the net excess kilowatt-hours generated during the billing period, with this kilowatt-hour credit appearing on the Customer’s bill for the following billing period; (ii) and agrees that in each new net metering fiscal year beginning April 1 of each year, any and all kilowatt-hour credits remaining in the Customer’s account at the time of the Customer’s first scheduled meter reading of the new fiscal year shall be set to zero

Rebates Offered
0
Deregulated
1

Interconnection & taps

Approval Req To Install
Yes
Interconnection Level
3
Line Taps Allowed
1
Load Taps Allowed
1
Automatic Transformer Upgrade Size
0
Meter Aggregation Allowed
1

System size & offset

System Size Restrictions
0
System Size Restriction Type
No Restrictions
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
System Offset Notes

"SCL doesnt have a policy prohibiting a solar system from exceeding 100% of annual historical usage. However, excess generation will be retained as a kWh balance on their bill that rolls over until Mar 31, when we are required by law to clear the balance with no monetary compensation to the customer."

Offset Calc Tool
N/A

Metering & disconnect

Production Meter Required
No
AC Disconnect Required
Yes
AC Disconnect Labeling
Visible Lockable Labeled Disconnect
Allowed Meter Adapter
None

Plans & docs

Site Plan Reqs

AC Disconnects shall be 24/7 accessible to utility personnel, not blocked by gates, fences, or other obstructions

SLD Reqs

Standard

Electric Service Reqs

Interactive map: ESR Combined - English (arcgis.com)

MPU

  • Any modification to underground-fed services that have existing direct-buried cable will require the installation of a NEW conduit run (SCL 1561.05)
  • Utility will provide a drawing specifying the route of the conduit
  • All work associated with trenching, backfeed, and restoration must be completed by, and at the expense of the customer

The following minimum meter clearances must be maintained:

  • Meter Height: The meter height for a single-meter socket must be between 4 feet (minimum) and 6 feet (maximum) (Reference: SCL RESC | Section 6.6.1 | Meter Height Clearances).
  • Between either side of the electric meter and any wall, vegetation, bump out, additional meter: 18 inches.
  • Above the center of the electric meter: 36 inches
  • Between the closest edge of a gas meter vent and the closest edge of any electric utility enclosure, e.g., meter socket, CT cabinet, tap can, etc.: 36 inches
  • Metering equipment must not be installed over stairs, stairwells, steps, or public walkways.
  • Meter locations must not be under or over any structure which might be enclosed or removed in the future, such as a porch, deck, carport, or stairway.
  • A bollard or fall protection will need to be installed if a meter is located within 3 feet of an active driveway, alley, or parking area.
Placards

All signage must be installed per NEC 110.21 (B) and (C).

Electrical Stamp Required
0
Equipment Approvals
California Energy Commission
Meter Num Req SLD 3LD
0
ESID Num Req SLD 3LD
0
Website
link

Other details

Restrict Inspection
0
Revision Required
1
Mod Swap Requires Planset
1
Address ID
4249844
Express Planset Eligible
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Seattle City Light before you rely on this. The useful move: if an installer says you need a main panel upgrade, ask how these tap and interconnection policies were considered first.