Solar Savings Analysis — Lewisville, Texas

Electricity Market Structure in Lewisville

Lewisville is served by Oncor Electric Delivery and operates within the ERCOT deregulated retail electricity market. Located in Denton County along the I-35E corridor, Lewisville serves as a significant commercial and residential hub in the mid-DFW-to-north-Texas corridor.

Lewisville falls within the ERCOT North Load Zone. Its position along a major interstate corridor contributes to a notably mixed load profile, with substantial retail commercial, hospitality, and logistics activity alongside a diverse residential base. Lewisville Lake's proximity also introduces geographic variability in irradiation conditions relative to the flat suburban grid to the south.

For additional context on Oncor Electric Delivery's role as the transmission and distribution operator in this market, see the Oncor Electric Delivery utility authority node.

Solar Irradiation Context — Lewisville

Lewisville, Texas receives an estimated annual average solar irradiation in the range of 4.8 to 5.2 kWh per square meter per day, based on NREL National Solar Radiation Database reference data for the North Texas geographic zone. This translates to approximately 5.0 peak sun hours per day on an annualized basis, representing a moderately high solar resource consistent with the broader Texas solar production environment.

City-level irradiation data is applied in SunScore™ modeling as a primary energy yield input. No ZIP code-level or address-level irradiation claims are made on this page. Actual solar output at any specific property will vary based on roof pitch, azimuth, shading obstructions, and system configuration.

Utility Territory & Delivery Structure — Lewisville

Oncor Electric Delivery serves Lewisville as the regulated transmission and distribution operator under PUCT oversight. Oncor does not set retail electricity prices in the deregulated Texas market. Retail rates are established by competing retail electricity providers (REPs). The delivery charge component of a retail electricity bill — covering Oncor's transmission and distribution infrastructure — is regulated separately from the energy supply charge. SunScore™ projection modeling addresses the energy supply component of the retail bill, not the regulated delivery charge. Methodology detail is available at SunScore™ Projection Methodology.

Retail Electricity Baseline — Lewisville (EIA 2024 Reference Year)

Residential electricity rate modeling for Lewisville uses EIA Form 861 data for the 2024 reference year within the Oncor delivery territory in Denton County. Retail competition in this corridor reflects the deregulated dynamics of the broader North Texas market, with rate variation by provider and contract structure.

All rate references on this page derive from publicly available EIA Form 861 data for the 2024 reference year and represent historical average figures. They are not real-time rates, guaranteed future rates, or provider-specific quotes. Actual retail electricity prices in Lewisville vary by retail electricity provider, contract type, and enrollment date. Consumers seeking current rate information may consult the Power to Choose portal maintained by the Public Utility Commission of Texas.

Avoided Cost & Export Compensation Context — Lewisville

Avoided cost for Lewisville is modeled using the ERCOT North Hub wholesale-proxy baseline. As with all Oncor-territory North Texas cities, self-consumption of solar output avoids the residential retail rate while grid export is valued at substantially lower wholesale-proxy levels. This asymmetry drives the self-consumption weighting in SunScore™ projection scenarios.

In the ERCOT market structure, solar energy consumed on-site avoids the retail rate, while energy exported to the grid is compensated at or near wholesale-proxy levels — a materially lower value. SunScore™ projections distinguish between self-consumption and export scenarios in the modeled output. A detailed explanation of the avoided cost framework is available at our Avoided Cost methodology guide.

Federal Incentive Layer — Lewisville (ITC 30% Reference)

The federal Investment Tax Credit (ITC), currently structured at 30% of eligible system cost under the Inflation Reduction Act as of the 2024 reference year, is available to qualifying homeowners in Lewisville who install eligible solar photovoltaic systems. This credit is non-refundable — it reduces federal income tax liability but does not generate a direct cash payment if the credit exceeds tax liability in the installation year. Unused credit amounts may carry forward to subsequent tax years subject to applicable IRS rules.

The federal ITC is incorporated as an incentive layer input in SunScore™ projected payback and return scenarios. GetSunScore does not provide tax advice. Homeowners should consult a qualified tax professional to assess personal eligibility and application. A detailed explanation is available at Federal Solar Tax Credit Explained.

Modeled Projection Context — Lewisville

Lewisville's residential base reflects a wide range of construction eras, from established neighborhoods near the original city core to newer developments in the city's southern and western expansion areas. The presence of Lewisville Lake to the north introduces an interesting solar resource variable: lakeside and near-lake properties may experience marginally different atmospheric conditions — including elevated humidity and occasional cloud formation — relative to more inland suburban locations. SunScore™ modeling applies city-level NREL irradiation data that captures North Texas regional averages; localized microclimate effects at the property level are noted as a caveat in the platform's modeling assumptions documentation.

SunScore™ projections for Lewisville are generated by synthesizing NREL irradiation data for the Lewisville geographic zone, EIA Form 861 rate baselines for the 2024 reference year, publicly available residential system performance assumptions, and applicable federal and state incentive layer inputs. The output is a modeled estimated savings range expressed as an annual and cumulative scenario over a defined projection horizon.

All SunScore™ projections are non-binding modeled scenarios. They do not constitute financial advice, a solar installation quote, or a guaranteed savings figure. Full methodology documentation is available at SunScore™ Projection Methodology, GetSunScore Data Sources, and Modeling Assumptions.

Solar Installation Pathway in Lewisville

Homeowners in Lewisville who have reviewed GetSunScore's modeled solar savings projection and wish to proceed with installation evaluation may do so through the standard residential solar qualification and contractor evaluation process.

GetSunScore does not install solar systems, endorse specific solar contractors, or recommend providers. Qualified homeowners seeking installation evaluation may consult the installer directory referenced in GetSunScore's partner network documentation.