Avista Utilities (WA)

Washington Utility Interconnection & net metering rules

Spot something wrong?

Tariffs and interconnection rules move often. If something here is out of date or missing, tell us and we'll fix it.

Report a correction
Net Metering AllowedYes
NEM TypeMonthly
Line Taps AllowedYes
Load Taps AllowedYes
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
Yes
NEM Type
Monthly
Post Solar Billing Method
Net Metering
Net Excess Generation Notes

Any net excess generation (NEG) during a monthly billing period is credited to the customer's next bill at the utility's retail rate. At the beginning of each calendar year, any remaining NEG is granted to the utility with no compensation for the customer.

Rebates Offered
No
Deregulated
No

Interconnection & taps

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

System size & offset

System Size Restrictions
100
System Size Restriction Type
AC kW
System Size Battery Included
No
System Size Includes Existing Systems
No
Offset Type
No Restrictions
Offset Value
0
Offset Calculation Period
0
Industry Standard Watts Sqft
2
System Offset Notes

Net metering limit is 100 kW.

The intent of Net Metering is to offset usage, any bank (overage of generation kwh) is reset annually on 3/31. There is no compensation for any generation lost during the reset.

Offset Calc Tool
Historical Usage

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
  • If possible, please install the the AC disco next to the utility meter (within 10 feet).
  • If not possible, please ensure that the placard map is installed in the utility meter to show the location of the AC disconnect. (Please include the proposed Placard Map in the PV Plans)
SLD Reqs

PM can be installed at customer request, but is not required.

Placards


Equipment Approvals
California Energy Commission
Meter Num Req SLD 3LD
No
ESID Num Req SLD 3LD
No
Website
link

Other details

Revision Required
Yes
Mod Swap Requires Planset
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Avista Utilities (WA) 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.