Guam - Net Metering
If you install solar, wind, or another eligible renewable system at your Guam home, Guam Power Authority (GPA) must let you net meter, so exported power offsets your bill. Residential systems can be up to 25 kW, and GPA must provide a bi-directional meter without charging you fees beyond those paid by other customers in your rate class. Excess credits carry forward month to month but expire at the end of the calendar year with no payment, so size your system to your own use and contact GPA to apply.
Your Guam customers can net meter eligible systems (solar PV, wind, biomass, hydro, fuel cells, microturbines or hybrids), with limits of 25 kW residential and 100 kW non-residential under GPA's Schedule C. Non-residential systems up to 500 kW are allowed under a 2024 law, but those above 250 kW must include battery storage with at least 1 hour of capacity, and non-residential systems over 100 kW get no compensation for excess power sent to the grid. Systems must meet National Electric Code, UL and IEEE safety and power quality standards, and GPA cannot require extra controls, added fees or supplemental liability insurance from compliant systems.
Net metering in Guam stems from Public Law 27-132 (2004), amended by Public Law 30-141 (2010) and Public Law 37-71 (2024), and is administered by GPA with oversight from the Guam PUC. Caps are 25 kW residential and 100 kW non-residential under Schedule C, with non-residential systems up to 500 kW allowed and systems above 250 kW requiring at least 1 hour of battery storage. Billing is monthly unless the customer consents in writing to a longer period, excess credits carry forward and expire at calendar year end uncompensated, and GPA supplies bi-directional meters without extra customer fees; the program serves residential, commercial, industrial, nonprofit, school, agricultural and institutional customers.
Program details
- Program ID
- 2852
- Last updated
- 3/25/2026
Eligibility
- Sectors
- commercial industrial nonprofit residential schools agricultural institutional
- Technologies
- solar photovoltaics wind (all) biomass hydroelectric fuel cells using non-renewable fuels wind (small) hydroelectric (small) fuel cells using renewable fuels microturbines lithium-ion
Program summary
Eligibility and Availability
In 2004, Guam enacted legislation (Public Law 27-132) requiring the Guam Power Authority (GPA) to allow net metering for customers with fuel cells, microturbines, wind energy, biomass, hydroelectric, solar energy or hybrid systems of these renewable energy technologies. In 2010, Guam amended net metering (Public Law 30-141) and raised the system capacity limits to 25 kilowatts (kW) for residential systems and 100 kW for non-residential systems. In February 2024, the non-residential cap was expanded to 500 kW by Public Law 37-71. However, non-residential systems in excess of 250 kW must be paired with a battery storage system with at least 1 hour of storage capacity.
Netting Period and Process
Customer-generators may be billed on a monthly basis, or with their written consent, on a quarterly, semi-annual or annual period. 12 GCA § 8505 provides that if a system has produced net excess generation at the end of the billing period the customer-generator is entitled to compensation at a rate to be determined by the Guam Public Utility Commission (PUC). GPA's Schedule C for net metering, however, clarifies that excess generation credits will be carried forward monthly, and expire at the end of the calendar year with no compensation to the customer. Public Law 37-71 added a provision providing that non-residential customers with a generator in excess of 100 kW is not entitled to compensation for any excess electricity fed back to the grid. Accordingly, customers eligible for GPA's Schedule C are limited to 25 kW for residential systems and 100 kW for non-residential systems.
GPA must provide customer-generators with a bi-directional energy meter and may, at its own expense, install additional meters. GPA may not charge customer-generators any fees above and beyond those it charges to other customers in the same rate class that do not use a net-metered energy system.
Net-metered systems must meet all applicable safety and power quality standards established by the National Electric Code, Underwriters Laboratories (UL) and the Institute of Electrical and Electronic Engineers (IEEE). The utility may not require customer-generators whose systems meet these standards to meet further requirements, install additional controls or purchase supplemental liability insurance.
Contact & resources
- Contact email
- rebecca.respicio@energy.guam.gov
Please verify current program details with the administering agency before making any financial decisions.
