Guam GPA Electricity & GWA Water Bill Calculator
Compute combined monthly utility expenses in Guam. Calibrated to Guam Power Authority (GPA) non-fuel base tariffs, Levelized Energy Adjustment Clause (LEAC) fuel factor, and Guam Waterworks Authority (GWA) volumetric water and sewer charges.
Household Consumption Parameters
Typical air-conditioned home in Guam uses 800 - 1,200 kWh/mo.
Current Levelized Energy Adjustment Clause approved by PUC (~$0.239/kWh).
Average household of 3 to 4 people uses ~5,000 to 7,000 gallons.
Itemized Utility Tariff Schedule (GPA & GWA)
| Utility Agency | Tariff Component | Rate Specification | Monthly Outlay ($) |
|---|---|---|---|
| Total Monthly Combined Utility Obligation | $428.50 | ||
Guam Utility Rate Regulations & LEAC Mechanics
Utility services on Guam are operated by autonomous government agencies under the regulatory authority of the Guam Public Utilities Commission (PUC) and the elected Consolidated Commission on Utilities (CCU):
- GPA Non-Fuel Base Rate : The base energy rate covers power plant capital amortization and grid distribution, averaging ~$0.118 per kWh for residential customers, plus a $15.00 monthly customer charge.
- Levelized Energy Adjustment Clause (LEAC) : Guam generates electricity primarily from imported low-sulfur fuel oil (RFO) and ultra-low-sulfur diesel. The LEAC adjusts semi-annually to pass through direct fuel costs without markup. The LEAC often accounts for 65% to 75% of the total electric bill.
- GWA Tiered Water Rates : Guam Waterworks Authority applies tiered volumetric blocks per 1,000 gallons (kgal): Tier 1 (0-5 kgal at $3.25), Tier 2 (5-15 kgal at $6.50), and Tier 3 (>15 kgal at $10.20), plus an $11.00 base customer service charge.
- Wastewater Surcharge : Properties connected to GWA municipal sewer infrastructure incur a base charge ($38.50) plus an effluent recovery fee tied to water consumption.
Frequently Asked Questions
What is the LEAC on a Guam power bill?
LEAC stands for Levelized Energy Adjustment Clause. It is the fuel surcharge approved by the PUC that reflects GPA's actual cost to purchase fuel oil to generate electricity.
Why are electricity rates in Guam higher than mainland US?
Guam is an isolated island electrical grid without pipeline access, relying on ocean shipping of refined petroleum fuel, resulting in average costs of $0.34 to $0.38 per kWh.
How often does the LEAC fuel factor change?
The PUC reviews and resets the LEAC rate twice annually (effective February 1 and August 1), though emergency adjustments can be approved if world oil prices fluctuate sharply.
How is GWA sewer charge determined?
GWA assesses a flat monthly wastewater customer fee of $38.50 plus a volumetric treatment rate for each 1,000 gallons of metered water consumption.
Can residential solar net metering offset GPA power bills?
Yes, GPA operates a Net Energy Metering (NEM) program allowing rooftop solar owners to sell surplus generation back to the grid to offset consumption.
📊 Guam Department of Revenue & Taxation (DRT) Mirror Code Matrix
| Statutory Component / Legal Deduction Item | Calculated Amount (USD) |
|---|---|
| Primary Net / Statutory Payable Amount | $0.00 USD |
Engr. Muhammad Shahzad
Principal Financial Systems Architect & US Territory & Guam Department of Revenue and Taxation Architect
Lead software and systems architect specializing in high-performance browser computing, algorithmic validation, financial models, and zero-telemetry client-side privacy architecture.