Guam Power Authority (GPA) Rate Selection Guide
Guam Power Authority is the government-owned electric utility serving all 53,777 customers on Guam, regulated by the Guam Public Utilities Commission. A $16M ARRA-funded smart grid project deployed 56,735 AMI meters territory-wide — daily kWh data is visible in MyEnergyGuam and 18 months of bills in PayGPA — but there is no Green Button, ESPI, EDI, or third-party API, so sub-hourly interval data requires manual requests to GPA.
Market Overview
GPA is a government-owned public utility serving all of Guam under Guam Code Title 12, Chapter 8, with rates regulated by the Guam Public Utilities Commission (GPUC). There is no retail choice; rates include a Levelized Energy Adjustment Clause (LEAC) for fuel costs.
Need to pull your actual usage data to compare rates? See the Guam Power Authority (GPA) Data Access Guide →
Current Rate Schedules
Guam Power Authority (GPA) bills under GPUC-regulated rate classes: G (General Service Non-Demand), J (General Service Demand), and P (Large Power Service), plus residential. Every bill carries two main components — the base rate (infrastructure, generation, debt service) and the Levelized Energy Adjustment Clause (LEAC), the fuel recovery charge reset twice yearly. The LEAC is the dominant cost driver (fuel is roughly two-thirds of GPA's cost structure) and recently ran in the $0.25-$0.26/kWh range, stepped by delivery voltage — secondary customers pay the most, 115 kV transmission customers the least. A PUC-approved base rate adjustment and LEAC reduction took effect together January 1, 2026; see GPA's rates page for current schedule-level figures.
Effective: January 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Schedule G — General Service Non-Demand | commercial | Small commercial accounts without demand metering | Customer charge + per-kWh base energy charge + LEAC at the secondary delivery rate (recently ~$0.262/kWh). See GPA rates page for current base charges. | See tariff; LEAC alone recently ~$0.26/kWh |
| Schedule J — General Service Demand | commercial | Mid-size commercial accounts with demand metering (hotels, retail centers, offices) | Customer charge + demand charge per kW + energy charge per kWh + LEAC by delivery voltage. The January 2026 PUC order realigned commercial schedules to cost of service — see tariff for current $/kW and $/kWh. | —+ See tariff for current $/kW |
| Schedule P — Large Power Service | industrial | Large commercial, industrial, and government loads, often served at primary voltage (13.8 kV, 34.5 kV, or 115 kV) | Demand-billed with voltage-differentiated charges; primary/transmission-level customers pay a lower LEAC ($0.2503-$0.2541/kWh recently vs $0.262 secondary) reflecting reduced delivery losses. | —+ See tariff for current $/kW by voltage level |
| Schedule Z — Levelized Energy Adjustment Clause (LEAC) | commercial | All customer classes — fuel recovery rider applied per kWh by delivery voltage | Reset twice yearly via GPUC review; recently $0.261995/kWh (secondary), $0.254148 (13.8 kV), $0.253416 (34.5 kV), $0.250297 (115 kV). Declines as utility-scale solar displaces fuel oil generation. | $0.250-$0.262/kWh by voltage |
Rate Recommendations by Use Case
C&I daily usage monitoring
Register every account in MyEnergyGuam to capture daily kWh trends, projected usage, and consumption alerts from GPA's AMI network.
Daily AMI data is the richest self-serve granularity GPA exposes; alerts catch usage anomalies between bills.
- Register with Account Number and Last Bill Amount
- Set custom consumption alerts per facility
- Use the rate calculator to sanity-check projected bills
Interval data for load analysis
Request raw 15/30-minute AMI data directly from GPA for demand profiling — the meters capture it even though portals don't show it.
Territory-wide AMI means sub-hourly data exists; a specific written request to customer service is the only retrieval path.
- Call (671) 647-5787 Option 3 or email customersfirst@gpagwa.com
- Specify accounts, date range, granularity, and format
- Budget 2-4 weeks per request and batch accounts together
Third-party consultant access
Use written authorization or power of attorney and route requests through GPA's business customer service.
No Share My Data or API exists, so GPA verifies each authorization manually and negotiates delivery case-by-case.
- Keep signed authorizations on file for every account
- Use businessfirst@gpagwa.com for business accounts
- Escalate unresolved data access issues to the GPUC (guampuc.com)
Watching for modernization
Track GPA's CIS modernization (SAP, RFP GPA-RFP-26-004) and IRP-driven IT roadmap for future API or Green Button adoption.
The 2022 Integrated Resource Plan flags IT modernization; standardized data access may follow as the CIS work lands.
- Monitor GPA procurement notices
- Ask business customer service about EDI and integration roadmaps
- Re-evaluate integration options annually
Cost Optimization Strategies
GPA's all-in rates are among the highest under the U.S. flag because fuel oil drives roughly two-thirds of costs through the LEAC — so every kWh avoided or self-generated is worth far more on Guam than on the mainland. The levers: efficiency and solar (offsetting a ~$0.25+/kWh fuel rider), demand management on Schedules J and P, primary-voltage service for large loads, and LEAC-cycle budgeting.
Efficiency at LEAC-inflated value
For: All commercial and industrial customers
With the fuel rider alone recently above $0.25/kWh, efficiency projects (chiller plant optimization, LED, VFDs, building controls) pay back two to three times faster than mainland equivalents. Prioritize cooling — it dominates commercial load in Guam's climate.
On-site solar self-generation
For: Facilities with available roof or land
Rooftop solar directly offsets some of the highest avoidable energy costs in the U.S.; Guam's solar resource is strong year-round. Size for self-consumption and verify current GPA interconnection and net metering terms before design.
Demand management on Schedules J and P
For: Schedule J and P accounts
Demand-billed accounts should stagger chiller and equipment starts, pre-cool ahead of occupancy, and use AMI data to monitor monthly peaks — each avoided kW reduces the demand line every month.
Primary-voltage service election
For: Large loads near transmission infrastructure
Customers able to take service at 13.8 kV or higher pay a lower LEAC (about 0.8-1.2¢/kWh below secondary) and typically lower base delivery charges, in exchange for owning their transformation. For multi-GWh loads this compounds meaningfully.
LEAC-cycle budgeting
For: All accounts; critical for energy-intensive operations
The LEAC resets twice yearly through GPUC filings and tracks fuel oil markets and renewable build-out. Monitoring GPA's LEAC filings lets facilities forecast the largest bill component and time discretionary energy-intensive work.
To implement these strategies, you need your 15-minute interval data. Learn how to download Guam Power Authority (GPA) interval data →
Frequently Asked Questions
Can commercial customers get 15-minute interval data from GPA?▾
Technically yes — GPA's territory-wide AMI (56,735 smart meters from a $16M ARRA smart grid project) captures sub-hourly data — but it is not exposed through any portal. Request it directly at (671) 647-5787 Option 3 or customersfirst@gpagwa.com; GPA assesses requests case-by-case with no published SLA. MyEnergyGuam shows daily kWh only.
Does GPA support Green Button, ESPI, or a public API?▾
No. GPA is not in the Green Button Alliance Directory, does not implement ESPI/NAESB standards, and has no developer portal or documented API. Nectar provides API access to this utility's billing and interval data — see docs.nectarclimate.com — alongside GPA's portal access and manual request channels.
How much billing history is available, and in what format?▾
PayGPA provides up to 18 months of billing statements viewable as PDF, plus payment history and per-period usage. There is no CSV or XML export from PayGPA, MyEnergyGuam, or the Pay-GPWA mobile app — all are view-only.
How does a consultant access a client's GPA data?▾
Through manual authorization: the customer signs written consent or a power of attorney, and the consultant submits it with account number, date range, data types, and preferred format to customersfirst@gpagwa.com (residential) or businessfirst@gpagwa.com (business). GPA verifies and negotiates delivery case-by-case; expect roughly 2-4 weeks with no recurring delivery.
Does GPA offer EDI for large business accounts?▾
Not publicly documented. GPA runs an SAP-based CIS that may support integration, but no transaction set specs (814/820/867), trading partner agreements, or VAN details are published. Inquire through businessfirst@gpagwa.com or (671) 647-5787 Option 1; expect a 5-10 business day response.
Who sets GPA's rates and where are they published?▾
The Guam Public Utilities Commission (GPUC) regulates GPA under Guam Code Title 12, Chapter 8. Rate schedules are at guampowerauthority.com/rates, and fuel costs flow through the Levelized Energy Adjustment Clause (LEAC). There is no retail choice on Guam.
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