Texas Solar Authority Hub

NREL Data VerifiedEIA Data VerifiedPUCT Data VerifiedIRS Data Verified

Institutional analysis of the Texas electricity market structure, TDU utility territories, and solar ROI modeling framework analyzed for the 2024 reference year.

Texas operates the largest deregulated electricity market in the United States. Unlike vertically integrated utility states, Texas separates energy supply from energy delivery through a structure governed primarily by ERCOT under a distinct wholesale structure documented in our Modeling Framework. This architecture creates a residential solar environment that differs materially from other states — and requires municipal-level modeling rather than statewide averages.

The Structure of the Texas Electricity Market

Texas electricity is governed by ERCOT, an independent system operator responsible for approximately 90% of the state's total electricity load. ERCOT operates an energy-only wholesale market — generators are compensated for energy produced rather than for standby capacity. This structural distinction contributes to higher wholesale price volatility during periods of grid stress, a factor relevant to solar export value modeling.

Deregulation and Retail Choice

Approximately 85% of Texas electricity customers reside in deregulated territories. In these regions, the electricity supply chain is divided between two distinct actor types:

  • Transmission and Distribution Utilities (TDUs): Own and maintain the physical grid infrastructure — poles, wires, and metering equipment. Delivery charges are regulated by the PUCT and are not subject to consumer choice.
  • Retail Electric Providers (REPs): Sell electricity plans to consumers. REPs compete on pricing structures, contract terms, and renewable content.

Because TDU delivery charges are not offset by solar export credits, even a system that generates 100% of annual consumption will not eliminate the total electricity bill in most Texas service territories. For a detailed breakdown of the REP and TDU cost structure, see our Modeling Framework. For terminology definitions related to REP plans and TDU delivery charges, see the Solar Glossary.

Why Texas Solar Economics Differ from Other States

Texas does not mandate statewide net metering. In regulated states, utilities typically offer fixed 1:1 retail-rate crediting for solar energy exported to the grid. In Texas, solar compensation is governed entirely by individual REP plan structures, which vary significantly by buyback rate structures, export caps, and time-of-use components.

Transmission & Distribution Utility (TDU) Territory Structure

Solar economics in Texas vary materially by TDU service territory because delivery charges, base fees, and metering structures differ across regions. All SunScore™ city-level projections are calibrated to the specific TDU filing applicable to that municipality's service area. Within the Oncor service territory, markets such as Dallas, Fort Worth, and Arlington exhibit delivery charge impacts that differ structurally from Houston-area markets.

Oncor Electric Delivery

Serving the Dallas–Fort Worth metroplex and North Texas. Includes Dallas, Fort Worth, Arlington, Plano, and Frisco.

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CenterPoint Energy

Greater Houston metropolitan area. High cooling loads and significant solar irradiation yield profile.

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AEP Texas

West and South Texas divisions, including Rio Grande Valley and Corpus Christi markets.

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TNMP

Serving select Gulf Coast and East Texas regions, overlapping portions of Houston and coastal zones.

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For complete coverage across active Texas municipalities, see the Texas Cities Index.

How SunScore™ Models Solar ROI in Texas

SunScore™ projections are built using a structured Modeling Framework that integrates publicly available datasets at the territory level.

Core modeling inputs include NREL solar irradiation data, EIA consumption benchmarks, PUCT TDU delivery charge schedules (2024 reference year), and standard panel degradation assumptions of 0.5% annually as documented in the Analytical Assumptions.

Energy Offset vs. Export Credit

Energy Offset

Reflects solar energy consumed directly by the homeowner, displacing retail electricity purchases at the applicable REP rate.

Export Credit

Reflects compensation for excess solar generation exported to the grid, subject to REP buyback plan terms.

ERCOT Wholesale Volatility and Modeling

Texas's energy-only wholesale structure creates episodic price spikes. While most fixed-rate REP customers are insulated, indexed pricing and real-time passthrough plans introduce significant risk asymmetry that influences solar ROI interpretation. For territory-level modeling implications and structural assumptions, see the Analytical Assumptions.

Regulatory Oversight and Data Integrity

PUCT
Rate Filings
ERCOT
Grid Ops
EIA
Consumption
NREL
Irradiation
IRS
Tax Credits
DSIRE
Policy

Institutional Positioning

GetSunScore™ is an independent solar savings intelligence platform. The platform does not install solar systems, provide financial advice, offer real-time electricity contracts, or represent any specific Retail Electric Provider. All projections are modeled estimates based on publicly available datasets and are intended for educational and comparative analysis only.

Frequently Asked Questions — Texas Solar Hub

Texas does not mandate statewide net metering. Unlike regulated utility states where fixed 1:1 retail-rate crediting is common, solar export compensation in Texas is determined by individual Retail Electric Provider (REP) plan structures. Buyback rates, export caps, and credit mechanisms vary by plan. The SunScore™ Projection Engine uses publicly available benchmark structures to model export scenarios. Actual compensation depends on the REP contract in place at time of installation.

Eligible Texas homeowners may qualify for the federal Residential Clean Energy Credit (ITC), which provides a 30% credit against the cost of a qualifying residential solar installation, applied against federal income tax liability. Specific eligibility, basis calculation, and carryforward rules are governed by IRS Publication 5695. SunScore™ projections incorporate this incentive as a line-item reduction in modeled system cost. Consult a qualified tax professional for individual eligibility determination.

Dallas and Houston are served by different TDUs — Oncor Electric Delivery and CenterPoint Energy — each with distinct delivery charge schedules filed with the PUCT. Additionally, Houston's higher average annual irradiation and distinct electricity consumption profile produce different modeled output and savings ranges. Because GetSunScore™ models at the utility territory and city level rather than using statewide averages, these differences are reflected in each market's projection data.

ERCOT's energy-only wholesale structure creates episodic price volatility during extreme weather events. SunScore™ projections use publicly available fixed-rate benchmark structures as the baseline scenario and do not model real-time wholesale passthrough. Results may vary materially based on REP contract type.

Texas does not currently offer a state income tax credit for residential solar installations. However, Texas provides a property tax exemption for the added value of solar energy systems on residential property under Texas Tax Code Section 11.27, as of the 2024 reference year. Local utility rebate programs may exist in specific service territories — availability varies and should be verified against current utility filings. All incentive references are based on publicly available 2024 information and are subject to change.

Municipal Index

Direct access to modeled solar savings benchmarks for active North Texas territories.

Dallas ROI AnalysisFort Worth ROI AnalysisArlington ROI AnalysisPlano ROI AnalysisFrisco ROI AnalysisMcKinney ROI AnalysisIrving ROI AnalysisGarland ROI Analysis
View Full Cities Index

2024 Reference Cycle

Modeling inputs are currently locked to the 2024 annual snapshot. All rate and incentive references published on this platform include explicit year labeling.

View Methodology Data Sources Guide