SGIP Monitoring Requirements for Battery Storage

What is SGIP and who administers it?

The Self Generation Incentive Program (SGIP) is a California Public Utilities Commission (CPUC) program that pays incentives for distributed energy resources installed on the customer side of the utility meter. Qualifying technologies range from wind and fuel cells to advanced energy storage and combined solar and storage.

The CPUC sets the rules in the SGIP Handbook and delegates operation to Program Administrators: Pacific Gas and Electric, Southern California Edison, Southern California Gas, the Center for Sustainable Energy, and the Los Angeles Department of Water and Power. The handbook states that the purpose of the program is to contribute to greenhouse gas emissions reductions and demand reductions.

Why does SGIP require monitoring?

The first reason is the performance based incentive (PBI). New nonresidential storage projects are paid 50 percent of the incentive at completion and the remaining 50 percent as annual kilowatt hour payments. The per kWh rate is the remaining 50 percent divided by anticipated discharge, defined as energy capacity times 104 full discharges per year times the PBI period, and each year is paid against metered discharge. Under a CPUC decision issued in December 2025, nonresidential projects entering PBI status after December 30, 2025 have a two year PBI period instead of five.

The second reason is greenhouse gas performance. Nonresidential systems must reduce emissions by at least 5 kg of CO2 per kWh of rebated capacity each year. Projects that fall short have the PBI payment reduced by one dollar per kilogram of shortfall, capped at 100 percent of that year. Compliance is verified against a five minute marginal emissions signal, so the program needs interval data on when the system charged and discharged, not totals.

The third reason is cycling. New nonresidential systems must complete a minimum of 104 full discharges per year and residential systems 52.

What data must be reported and how?

Electrical meter data must be at 15 minute intervals. New nonresidential storage projects submit cycling data plus net energy charged and discharged in kWh and net real power in kW, in 15 minute intervals, monthly, through the PDP upload portal on selfgenca.com. Two CSV reports are due each month: the Application Interval Report, which drives the annual PBI payment, and the Meter Interval Report, which supports audits.

What are the metering requirements above and below 30 kW?

The handbook splits nonresidential storage at 30 kW. For systems 30 kW and larger, metering must be a separate interval data recording (IDR) meter or an onboard system functionally equivalent to one, recording at least every 15 minutes. AC meters go on the AC side of the storage device, must account for parasitic loads including thermal management and power conditioning, must be accurate to plus or minus 2 percent, and must appear on the California Energy Commission list of eligible system performance and revenue grade meters.

For systems under 30 kW, an onboard inverter based meter or DC to DC converter based meter is acceptable at plus or minus 3 percent, with the same measurement points and 15 minute logging. Both classes must display net charge, net discharge, and instantaneous power, and PBI projects must separately meter SGIP incentivized and non incentivized equipment.

Who reports, how often, and what happens when data is missing?

The handbook defines the Performance Data Provider (PDP) as a company that contracts with the SGIP participant to read and communicate metering data to the Program Administrators. Owners of PBI projects must contract with an approved PDP for a minimum of five years. The PDP retrieves, validates, formats, and submits the data.

Data must be submitted in full calendar months, and the PDP has until the first of the following month to upload. Annual PBI payments are processed only after a full year of data. If communication fails and 15 minute data accumulates for up to 24 hours, the PDP may estimate the interval values. Longer gaps are not accepted, and the handbook states that the Program Administrator will not pay any incentives based on missing, estimated, or invalid performance data. A gap in the meter feed is a gap in the payment.

How should you design an SGIP monitoring plan?

The handbook requires a proposed monitoring plan for generation projects 30 kW and larger, and the same structure fits storage: describe the system and its operating schedule, show the metering points on a one line diagram, state the data collected at each point and its frequency, and state how data is stored and transferred to the PDP and the Program Administrator.

Four choices prevent most problems. Place the meter where it captures parasitic loads, because the handbook counts HVAC and power conditioning against net discharge. Choose a CEC listed meter for any system 30 kW or larger before procurement. Use a logger with local buffering so a network outage never becomes an unrecoverable gap. Select the PDP early, because it must pass a data transfer test on a full month of data before it can submit for payment.

Intellect EnFORM is a data acquisition platform built around these rules: ruggedized edge hardware logs at up to 30 second intervals, store and forward buffering preserves data through outages, and it reads meters, inverters, and battery management systems over Modbus, DNP3, MQTT, and REST so one system produces the interval records the SGIP reports require.