Solar Energy in Port Arthur, Texas

Average Solar Resource Pop. 54,135

Port Arthur, Texas receives 4.62 kWh/m²/day of solar irradiance and 5.1 peak sun hours daily, representing average solar resources . A typical 5 kW residential solar system in Port Arthur produces approximately 7,388 kWh annually, potentially saving homeowners $924 per year on electricity bills. After the 30% federal Investment Tax Credit, a 5 kW system has an estimated payback period of 11.4 years, leaving roughly 14 years of profitable operation within a standard 25-year warranty. For maximum annual output in Port Arthur, panels should be tilted at approximately 30° and oriented true south (180° azimuth).

Solar Resource Summary

4.62
kWh/m²/day
GHI Annual
5.1
hours/day
Peak Sun Hours
4.24
kWh/m²/day
DNI Annual
GHI vs. US national average (4.5 kWh/m²/day) Average
0 7.5 kWh/m²/day

Monthly Solar Data

Month JanFebMarAprMayJunJulAugSepOctNovDec Annual
GHI (kWh/m²/d) 2.82 3.39 4.55 5.49 6.2 6.29 6.0 5.62 4.88 4.23 3.25 2.61 4.62
DNI (kWh/m²/d) 3.64 3.55 4.28 4.4 4.7 4.93 4.61 4.47 4.31 4.61 3.9 3.4 4.24
Source: NREL. Monthly averages in kWh/m²/day and °C.

Solar Production Estimates for Port Arthur

5 kW Residential
Typical home system
Residential
7,388 kWh/yr
616 kWh/month avg
≈ $924/year savings
10 kW Residential
Large home system
Residential
14,775 kWh/yr
1,231 kWh/month avg
≈ $1,848/year savings
50 kW Commercial
Small commercial
Commercial
73,876 kWh/yr
6,156 kWh/month avg
100 kW Commercial
Medium commercial
Commercial
147,752 kWh/yr
12,313 kWh/month avg

Production estimates based on NREL solar resource data, 30° tilt, south-facing orientation, and 80% performance ratio.

Local Solar Conditions in Port Arthur

Solar production in Port Arthur is relatively consistent year-round, ranging from 2.6 to 6.3 kWh/m²/day across the seasons.

Best Tilt Angle
30° (latitude-optimized)
Best Azimuth
180° (true south)
Coordinates
29.8849°N, -93.9399°

Financial Overview — Solar in Port Arthur

Solar is a sound investment in Port Arthur. A 11.4-year payback period is in line with the national average. With electricity rates likely to increase over time, actual payback may be shorter. Estimated annual savings from a 5 kW system: $924/year.

Avg. Electricity Rate
$0.125/kWh (TX avg)
Est. Annual Savings (5 kW)
$924/year
Est. Payback Period
11.4 years (after 30% ITC)
Federal ITC
30% of system cost
Net Metering
Available
Financial estimates assume a 5 kW system at $3,000/W installed ($15,000 pre-ITC, $10,500 after 30% credit). Actual costs vary by installer and equipment. Consult a local solar installer for firm quotes.

Solar FAQ — Port Arthur, Texas

In Port Arthur, Texas, a 5 kW residential solar system produces approximately 7,388 kWh of electricity per year. A 10 kW system produces about 14,775 kWh annually. These estimates use 4.6 kWh/m²/day average solar irradiance and an 80% system performance ratio, accounting for real-world losses from wiring, inverter efficiency, and temperature. Actual output will vary based on your specific roof orientation, shading, and equipment.

Port Arthur receives an average Global Horizontal Irradiance (GHI) of 4.62 kWh/m²/day. This is 0.12 kWh/m²/day above the US national average of 4.5 kWh/m²/day, placing Port Arthur near the national average. GHI measures total solar energy incident on a horizontal surface and is the primary indicator of a location's solar resource quality.

Port Arthur, Texas receives an average of 5.1 peak sun hours per day. Peak sun hours represent the equivalent number of hours when solar irradiance equals 1,000 W/m² — the standard condition used to rate solar panel output. This means a 1 kW solar panel array in Port Arthur produces 5.1 kWh on a typical day. Seasonal variation is significant: summer months see peak sun hours 40–60% higher than winter months in most US locations.

Port Arthur is a average location for solar panels, with 4.62 kWh/m²/day solar irradiance — near the national average. With an estimated payback period of 11.4 years, solar installations in Port Arthur can be financially attractive, especially given Texas's electricity rates.

The optimal tilt angle for solar panels in Port Arthur is approximately 30°, which corresponds to the city's latitude. This angle maximizes annual energy production by ensuring panels receive the most direct sunlight averaged over the year. For maximum winter output, tilt panels at latitude + 15° (45°). For maximum summer output, use latitude − 15° (15°). Fixed south-facing panels at the latitude angle are the standard recommendation for residential systems in Port Arthur.

A 5 kW solar system in Port Arthur can save an estimated $924 per year on electricity bills, based on Port Arthur's average electricity rate of $0.125/kWh. Over a 25-year system lifetime, that represents $23,100 in total savings before accounting for electricity rate increases. After the 30% federal Investment Tax Credit, the net system cost of approximately $10,500 for a 5 kW system yields a payback period of 11.4 years.

For a typical home in Port Arthur using 1,000 kWh/month, a 5 kW solar system producing 616 kWh/month would offset approximately 62% of a typical household's electricity use. Most residential installations in similar climates range from 5 to 12 kW depending on energy consumption, roof size, and budget. Use SolarScope's Site Studio to get a personalized system size recommendation based on your specific address and energy bills.

Based on local solar irradiance and electricity rates, a 5 kW residential solar system in Port Arthur has an estimated payback period of 11.4 years. This calculation assumes a net system cost of $10,500 (after the 30% federal ITC) and annual savings of $924. Modern solar panels carry 25-year performance warranties, so systems in Port Arthur would operate profitably for roughly 14 years after payback. Electricity rate increases over time typically reduce the effective payback period.

Other Cities in Texas

Austin
5.0 kWh/m²/d
Fort Worth
5.0 kWh/m²/d
San Antonio
4.8 kWh/m²/d
Dallas
4.7 kWh/m²/d
Houston
4.5 kWh/m²/d
Arlington
4.8 kWh/m²/d
Corpus Christi
4.9 kWh/m²/d
El Paso
5.9 kWh/m²/d
View all Texas solar data →
Learn more: Solar irradiance · Peak sun hours · GHI explained · Net metering · How solar analysis works

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This page shows area-level averages. For your specific address — accounting for roof orientation, shading trees, and your utility rate — use SolarScope's AI-powered Site Studio.

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Quick Stats

Annual GHI
4.62 kWh/m²/day
Peak Sun Hours
5.1 h/day
5kW Production
7,388 kWh/yr
Payback (5kW)
11.4 years
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