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City of San Marcos Electric Utility

Texas Utility Interconnection & net metering rules
Net Metering Allowed1
Line Taps Allowed0
Load Taps Allowed0
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
1
TOU Utility
0
Post Solar Billing Method
Export Rate
Solar Export Type
Avoided Cost
Solar Export Rate Approx
0.06
Solar Export Value Notes
COSM will reimburse customers for energy “delivered to” the COSM distribution system at the avoided cost. Reimbursements will likely take the form of a credit on the customer’s monthly bill.
Rebates Offered
1
Deregulated
1
Allows Standby
0

Interconnection & taps

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

System size & offset

System Size Restrictions
20
System Size Restriction Type
AC kW
System Size Battery Included
0
System Size Includes Existing Systems
0
Offset Value
0
Offset Calculation Period
0
Industry Standard Watts Sqft
2
Inverter Oversize Restrictions
0
System Offset Notes

The proposed generation system does not expect to export more than 15% of total load on the feeder

Offset Calc Tool
Historical Usage

Metering & disconnect

Production Meter Required
Yes
Production Meter Position
Inv-Disco-PM-POI
Production Meter Labeling
Production Meter
AC Disconnect Required
Yes
AC Disconnect Labeling
Visible Lockable Labeled Disconnect

Plans & docs

Site Plan Reqs

Standard

SLD Reqs

Example SLD uploaded to files

  • PV>Inverter>Disco>PM>MSP>UM
  • Production Meter required between disconnect and POI. (Disconnect to bottom of PM, Utility to top)
Electric Service Reqs

AC Disconnect Required

  • Location of the disconnect switch must be approved by COSM.
  • Disconnect switch shall be easily visible, mounted separately from metering equipment and readily accessible.

Production Meter Required

Electrical Stamp Required
0
Equipment Approvals
California Energy Commission
Meter Num Req SLD 3LD
0
ESID Num Req SLD 3LD
0
Website
link
Phone
(512) 393-8000

Other details

Restrict Inspection
0
Revision Required
1
Mod Swap Requires Planset
1
Address ID
4303345
Express Planset Eligible
No
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with City of San Marcos Electric Utility 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.