Solar Savings Analysis — Rockwall, Texas

Electricity Market Structure in Rockwall

Rockwall is served by Oncor Electric Delivery and operates within the ERCOT deregulated retail electricity market. Located east of Dallas along the shores of Lake Ray Hubbard, Rockwall has evolved from a satellite town into a primary residential and commercial destination in the eastern DFW corridor.

Rockwall is positioned within the ERCOT North Load Zone. The city's unique geography — essentially a peninsula on the eastern shore of Lake Ray Hubbard — produces a distribution sub-network that is served by Oncor's Rockwall and Rowlett infrastructure. Rockwall's load profile is predominantly residential, with significant retail and hospitality development clustered along the lakefront and I-30 corridor.

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 — Rockwall

Rockwall, Texas receives an estimated annual average solar irradiation in the range of 4.9 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 — Rockwall

Oncor Electric Delivery serves Rockwall 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 — Rockwall (EIA 2024 Reference Year)

Residential electricity rate modeling for Rockwall references EIA Form 861 data for the 2024 reference year for the Oncor delivery territory. Retail competition in Rockwall reflects North Texas deregulated market dynamics, with prices driven by the ERCOT North Hub baseline. Rockwall County's rapid residential growth has produced a competitive retail provider environment.

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 Rockwall 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 — Rockwall

Avoided cost for Rockwall is modeled using the ERCOT North Hub wholesale-proxy baseline. In the Rockwall residential market, solar self-consumption avoids the applicable retail rate, while grid export is valued at lower wholesale-proxy levels. Given the higher average household consumption common in Rockwall's newer residential developments, self-consumption weighting is a primary input in SunScore™ projection modeling.

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 — Rockwall (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 Rockwall 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 — Rockwall

Rockwall's residential landscape is characterized by significant lakeside development and newer subdivision expansion to the east and south. Proximity to Lake Ray Hubbard introduces minorLocalized humidity and morning cloud formation variables that can produce slight microclimate variations relative to more inland North Texas locations. Rockwall also features a modern housing stock with above-average square footage and, consequently, above-average electricity consumption patterns. These factors produce generally favorable conditions for solar siting analysis while introducing property-level consumption variables that SunScore™ projections address through city-level modeled averages.

SunScore™ projections for Rockwall are generated by synthesizing NREL irradiation data for the Rockwall 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 Rockwall

Homeowners in Rockwall 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.