Puerto Rico Electric Power Authority (PREPA / LUMA Energy) Rate Selection Guide
The Puerto Rico Electric Power Authority (PREPA) owns the electric infrastructure serving roughly 1.5 million customers across Puerto Rico, with LUMA Energy operating transmission, distribution, and customer-facing systems under a 15-year contract since 2021. C&I customers access billing data through the Mi LUMA portal, while interval data access awaits the island-wide Itron smart meter rollout running through approximately 2028.
Market Overview
PREPA owns all electric infrastructure; LUMA Energy operates the T&D system and customer-facing services under a 15-year contract (since June 2021), with Genera PR operating generation. The Puerto Rico Energy Bureau regulates rates and operations. No retail supplier choice exists.
Need to pull your actual usage data to compare rates? See the Puerto Rico Electric Power Authority (PREPA / LUMA Energy) Data Access Guide →
Current Rate Schedules
PREPA's rates are set by the Puerto Rico Energy Bureau (PREB) and administered by LUMA Energy, which operates the T&D system. Base rates have been largely unchanged since 2017 and currently make up only about 26% of the average bill — the remaining ~74% flows through riders, chiefly the Fuel Charge Adjustment (FCA) and Purchased Power Charge Adjustment (PPCA), which reset quarterly and drive most bill volatility. A comprehensive rate review (Case AP2023-0003) is underway, with new permanent base rates expected for FY2027 and proposed increases of roughly 10-12% across classes. C&I customers take service under the GSS/GSP/GST general service rates based on delivery voltage, with optional time-of-use variants at primary and transmission voltage.
Effective: August 28, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| GSS – General Service at Secondary Distribution Voltage | commercial | Small and mid-size commercial customers served at secondary voltage through one meter | Monthly customer charge plus energy charges, with demand billing for larger GSS accounts; subject to FCA, PPCA, CILT, and other reconciliation riders that comprise most of the bill | — |
| GSP – General Service at Primary Distribution Voltage | commercial | Commercial and industrial customers taking service at primary distribution voltage through one point of connection; customer provides the substation | $200/month customer charge; energy at $0.04694/kWh for the first 300 kWh per kW of maximum demand, $0.03894/kWh thereafter; demand at $8.10/kVA of 15-minute maximum demand; excess demand over contracted load billed at $10/kVA; $605 minimum bill plus riders | $0.039–$0.047/kWh base energy plus FCA/PPCA riders+ $8.10/kVA (15-min max) |
| GST – General Service at Transmission Voltage | industrial | Commercial and industrial customers connected to the transmission system with demand of 250 kVA or greater | $450/month customer charge; energy at $0.03650/kWh for the first 300 kWh per kW of maximum demand, $0.03250/kWh thereafter; demand at $7.70/kVA; excess demand over contracted load at $9.60/kVA; $2,375 minimum bill plus riders | $0.033–$0.037/kWh base energy plus FCA/PPCA riders+ $7.70/kVA (15-min max) |
| TOU-P / TOU-T – Time-of-Use General Service | commercial | Optional TOU variants for primary- and transmission-voltage general service customers | At primary voltage: energy at $0.05779/kWh on-peak and $0.01879/kWh off-peak with $8.10/kVA on-peak demand; at transmission voltage: $450/month customer charge, $0.04679/kWh on-peak and $0.01779/kWh off-peak energy, $7.70/kVA on-peak plus $1.00/kVA off-peak demand | On-peak ~$0.047–$0.058/kWh, off-peak ~$0.018–$0.019/kWh base energy+ $7.70–$8.10/kVA on-peak |
| LIS – Large Industrial Service (115 kV) | industrial | Industries with demand of 12,000 kW or higher, load factor ≥80%, and monthly average power factor ≥95% | $450/month customer charge; energy at $0.02496/kWh for the first 584 kWh per kW of maximum demand, $0.01896/kWh thereafter; demand at $6.00/kVA; load-factor penalty energy charges apply if monthly load factor falls below 80% for two consecutive months | $0.019–$0.025/kWh base energy plus riders+ $6.00/kVA (15-min max) |
Rate Recommendations by Use Case
C&I billing data collection today
Centralize PDF bill collection from Mi LUMA across all Puerto Rico accounts.
With no API, EDI, or Green Button, the Mi LUMA portal's 12-month PDF history is the only reliable first-party billing source; invoice parsing turns those PDFs into structured data.
- Register every account in Mi LUMA with business EIN credentials
- Download bills monthly before the 12-month window rolls off
- Use invoice-parsing tooling to extract charges and kWh from PDFs
Multi-site portfolio reporting
Negotiate a recurring manual reporting arrangement with LUMA for large portfolios.
LUMA handles third-party access case-by-case; portfolios with many accounts justify a dedicated account manager and periodic CSV/PDF reports under an NDA and customer authorization.
- Call 1-844-888-5862 and request a business customer representative
- Bring a signed customer authorization and propose a report cadence
- Industrial and government customers gained expanded Mi LUMA features in December 2025
Future interval data integration
Track the Itron smart meter rollout and prepare for a post-2028 data API.
LUMA's FEMA-funded AMI deployment (2025-2028) and planned Mi LUMA Phase 3 enhancements are the path to interval data; teams that prepare ESPI-aligned integrations now will onboard fastest.
- Monitor https://lumapr.com/news/ and PREB dockets for data access rulings
- Advocate for Green Button/ESPI compliance in conversations with LUMA
- Ask about pilot or early-access programs for smart meter data
Operational resilience monitoring
Use the undocumented Mi LUMA outage API for facility outage awareness.
The JSON outage endpoints provide region- and municipality-level outage status useful for multi-site operations on an island grid with reliability challenges — just treat them as unsupported.
- Poll /outage/regionsWithoutService and /outage/municipality/towns conservatively
- Build fallbacks since endpoints may change without notice
- Pair with on-site monitoring for critical facilities
Cost Optimization Strategies
Because roughly three-quarters of a PREPA bill flows through fuel and purchased-power riders, the biggest savings levers are reducing total kWh, managing kVA demand, and maintaining power factor — demand charges are billed in kVA, not kW, so poor power factor directly inflates the demand line. Customers with flexible load should evaluate the TOU options, where off-peak energy prices run roughly a third of on-peak.
Manage kVA demand peaks
For: GSP, GST, and LIS customers
GSP and GST demand charges ($8.10 and $7.70 per kVA) are set by a single 15-minute peak each month, and demand above contracted load is penalized at $9.60–$10/kVA. Use interval monitoring to stagger large motor starts, HVAC, and process loads, and right-size your contracted load to avoid excess demand charges.
Correct power factor
For: All demand-billed C&I customers, especially motor-heavy industrial loads
PREPA bills demand in kVA rather than kW, so a facility at 85% power factor pays ~18% more demand charge than the same load at 100%. Installing capacitor banks at motor-heavy facilities directly reduces billed kVA, and LIS customers must hold ≥95% power factor to stay on the rate.
Shift load to off-peak under TOU rates
For: Primary- and transmission-voltage customers with schedulable load
The TOU variants price off-peak energy at roughly $0.018–$0.019/kWh versus $0.047–$0.058/kWh on-peak, with off-peak demand at only $1.00/kVA at transmission voltage. Facilities that can run batch processes, refrigeration pull-down, or water pumping overnight can cut base energy costs substantially.
Hedge fuel-rider volatility with on-site solar and storage
For: C&I customers with roof or land area; particularly valuable given grid reliability concerns
The FCA and PPCA riders track imported fuel prices and reset quarterly, making Puerto Rico bills among the most volatile in the US. On-site solar paired with storage offsets rider-exposed kWh, improves resilience against outages, and qualifies for net metering credits under Rider NM.
Track the pending rate case
For: All C&I customers
LUMA's rate review (PREB Case AP2023-0003) proposes roughly 10-12% base-rate increases with new permanent rates expected for FY2027, plus potential class restructuring and changes to net-metering treatment. Budget for the increase and review whether your class assignment and contracted load remain optimal once new tariffs publish.
To implement these strategies, you need your 15-minute interval data. Learn how to download Puerto Rico Electric Power Authority (PREPA / LUMA Energy) interval data →
Frequently Asked Questions
How do C&I customers get billing data from PREPA/LUMA?▾
Register each account in the Mi LUMA portal at https://miluma.lumapr.com (business accounts register with their EIN at https://miacceso.lumapr.com). The portal provides 12 months of bills and payment history, with individual bills downloadable as PDF. Industrial and government customers gained expanded Mi LUMA features in December 2025, including invoice detail and payment history.
Is interval or smart meter data available from LUMA?▾
Not yet. LUMA's Itron smart meter deployment began in April 2025 in San Juan and runs roughly three years island-wide (about 2028). Interval data viewing is planned for a future Mi LUMA Phase 3 portal enhancement, but granularity (likely 15- or 30-minute) and export formats have not been announced. Legacy TWACS AMI does not expose customer interval data.
Does PREPA/LUMA support Green Button or EDI?▾
No. As of May 2026 there is no Green Button Download My Data or Connect My Data (no ESPI endpoints, no OAuth authorization), and no ANSI X12 EDI support (810, 814, 820, 867). Energy data platforms that depend on Green Button or EDI cannot integrate automatically with LUMA today.
How can a consultant or energy manager access a client's PREPA data?▾
Only through manual workflows. The customer downloads bill PDFs from Mi LUMA and shares them, or the customer and consultant contact LUMA at 1-844-888-5862 to set up a case-by-case manual reporting arrangement, which typically requires an NDA and written customer authorization. There is no automated Share My Data program.
Is there any API for PREPA/LUMA data?▾
Only an undocumented outage API. The endpoints at https://api.miluma.lumapr.com/miluma-outage-api/ return JSON outage status by region and municipality — useful for multi-site outage monitoring, but they carry no billing or consumption data and are unsupported. A consumption data API is plausible only after smart meter deployment completes around 2028.
Who regulates PREPA and where do tariffs live?▾
The Puerto Rico Energy Bureau (PREB) regulates PREPA/LUMA. Rate schedules, tariffs, and system operational data are published through PREB dockets at https://energia.pr.gov/dockets/ rather than a consolidated online tariff book. C&I customers can also request rate information through LUMA business customer service.
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