How does LUMA Energy interconnection and net metering measure system size?

The published limits do not say whether they are measured in alternating or direct current.

LUMA Energy interconnection and net metering: tiers, fees and insurance

How the size is measured: not published

The published limits here are stated in kilowatts without saying whether that is the inverter rating in alternating current or the array rating in direct current. On a system near a threshold that decides which band it lands in, so the checker asks the question rather than choosing an answer.

Size bands and what each one obliges

Expedited, up to 25 kW Size 0 to 25 kW	Systems at or under this size use LUMA’s standard net metering application path. The codified statute describes a 90 day expedited review for systems under 25 kW; LUMA’s own consumer page separately states a 30 day notification after application through its distributed generation portal. These are not confirmed to be the same step, so both are recorded rather than one being treated as superseding the other. A bidirectional meter is installed by LUMA as part of the process. No liability insurance required at this size, per LUMA’s published materials Bidirectional meter installed by LUMA
Above 25 kW Size 25.001 to 20000 kW	Above the expedited threshold, review is not on the fast path described above; no separate published timeline was found for this band. Public liability insurance is required once the system exceeds 300 kW. Public liability insurance required above 300 kW; no amount is published in the materials read

Expedited, up to 25 kW Size 0 to 25 kW

Systems at or under this size use LUMA’s standard net metering application path. The codified statute describes a 90 day expedited review for systems under 25 kW; LUMA’s own consumer page separately states a 30 day notification after application through its distributed generation portal. These are not confirmed to be the same step, so both are recorded rather than one being treated as superseding the other. A bidirectional meter is installed by LUMA as part of the process.

No liability insurance required at this size, per LUMA’s published materials
Bidirectional meter installed by LUMA

Above 25 kW Size 25.001 to 20000 kW

Above the expedited threshold, review is not on the fast path described above; no separate published timeline was found for this band. Public liability insurance is required once the system exceeds 300 kW.

Public liability insurance required above 300 kW; no amount is published in the materials read

The screens that decide it

Within the 25 kW expedited threshold Limit 25 kW.
The 25 kW figure is stated in LUMA’s own materials and in the codified statute without saying whether it is AC or DC. Confirm with LUMA before relying on it for a system near the line.
Below the 300 kW point where liability insurance is required Limit 300 kW.
LUMA requires public liability insurance for distributed generation capacity greater than 300 kW. No dollar amount is published in the materials read, and none is required below that size.

Ask the utility this, before you sell it

Is the 25 kW interconnection threshold measured on the inverter AC rating or the array DC rating? Neither LUMA’s consumer materials nor the codified statute state a basis, and the Technical Interconnection Requirements document that would likely settle it was not available to read during this research.
Is there a percentage of line section peak load screen, a minimum load test, or another engineering screen? None was found in the materials read, but LUMA’s technical requirements document itself was not read, so this is reported as not found rather than confirmed absent.
What insurance amount is required above 300 kW? LUMA states the requirement exists but not the amount.
Does storage or a non export or limited export configuration have separate terms? Nothing on this was found in LUMA’s consumer facing materials.
What is the current review timeline for a system over 25 kW? No published figure was found for that band.

Worth knowing before you quote

Net metering credit is trued up annually each June for the preceding twelve months rather than monthly, which changes how a savings estimate should be built.

Source

LUMA Energy net metering program pages and Interconnection and Net Metering Agreement for Individuals

Read and recorded 2026-09-12. LUMA’s own Technical Interconnection Requirements document, filed in Puerto Rico Energy Bureau docket NEPR-MI-2019-0009, could not be read as text during this research; the basis of measurement and any line section screen it may state are not encoded here for that reason.

All PR interconnection rules

Size bands and what each one obliges

The screens that decide it

Ask the utility this, before you sell it

Worth knowing before you quote

What to do with this