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    Stanislaus County · Reported cost

    Solar Panel Cost in Modesto, CA (2026): $3.32/W County Median

    By Updated 9 sources citedModesto, Stanislaus County

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    Homeowners in Stanislaus County who bought their own solar systems reported a median of $3.32 per watt between January 2025 and May 2026, across 240 systems. The middle half paid $2.71 to $3.96 per watt.

    The Modesto Irrigation District (MID), Modesto's main utility, is not in the CPUC's interconnection data, which covers only PG&E, SCE and SDG&E. The figure above is the nearest one: Stanislaus County homes those three utilities serve.

    A 6.8 kW system, the median size connected in Stanislaus County in 2025, comes to about $22,600 at that median, or $18,400 to $26,900 across the middle half.

    Those are reported costs, not a quote, and no federal credit comes off a Modesto system finished in 2026: 26 U.S.C. §25D does not cover one whose installation is completed after December 31, 2025 (state and federal rules).

    Median reported cost
    $3.32/W
    Stanislaus County, IOU-served homes, 240 systems
    Middle half
    $2.71 to $3.96/W
    25th to 75th percentile
    Typical 6.8 kW system
    $22,600
    6.8 kW × $3.32/W, before any incentive
    Same system, middle half
    $18,400 to $26,900
    size: Stanislaus County, IOU-served homes, 2025 median

    Source: California Distributed Generation Statistics (CPUC), Interconnected Project Sites data set, data through May 31, 2026, checked September 24, 2026. Homeowner-owned, solar-only systems of 1 to 25 kW; leases, PPAs and battery systems are left out (method). The CPUC notes these costs are not verified by the government.

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    What a solar permit costs in Modesto

    Modesto's published permit fee for a home rooftop system is $333 (electrical photovoltaic permit, residential (flat)). A commercial photovoltaic permit is a $1,098.00 deposit.

    That is $117 under the $450 limit that Government Code §66015 sets for a home system up to 15 kW.

    • What Modesto publishes: Modesto's Building Safety fee table for July 1, 2026 to June 30, 2027 lists a residential electrical photovoltaic permit at $333.00 per permit, due when you apply. A commercial photovoltaic permit is a $1,098.00 deposit.
    • How to file: Yes. Modesto's Building Safety Division takes permits online through its eTRAKiT permits portal, and the California Energy Commission's SB 379 data lists Modesto's automated solar permitting platform as SolarAPP+. The City's pages checked do not describe the solar route step by step.
    • Automated permit platform: SolarAPP+. Per the CEC SB 379 data (self-reported); the City pages checked do not describe the route.

    Sources: City of Modesto, Building Safety Fees (effective July 1, 2026 to June 30, 2027), checked September 23, 2026; California Energy Commission, Residential Solar Permitting Program data (SB 379 platform status as self-reported by each jurisdiction; data last updated August 3, 2026), checked September 23, 2026; Gov. Code §66015, checked September 24, 2026. Modesto in the California Solar Cost Index sets this fee beside every other city's.

    Solar data for Modesto: MID is not covered

    MID customers are not in the CPUC data, so nothing in it describes most Modesto homes. It does list 1 systems connected in 2025 at addresses it records as Modesto in PG&E territory; those homes buy power from PG&E, not MID.

    Across Stanislaus County homes served by PG&E, SCE or SDG&E, 48% of 2025 systems were leased or on a PPA, 49% had a battery and the median size was 6.8 kW.

    Source: CPUC DG Stats, data through May 31, 2026. Counts are home systems given permission to operate each year; a city means the service city on the application.

    Your utility: MID or TID

    The Modesto Irrigation District describes its electric service area as including the greater Modesto area north of the Tuolumne River, and the California Energy Commission's service-territory map places part of Modesto in the Turlock Irrigation District's territory. Neither is PG&E. Read the utility name on your bill before using either district's rates or solar rules. The CPUC's average-rate reports do not cover MID; read its own tariff and your bill.

    Sources: Modesto Irrigation District, Who We Are (electric service area); California Energy Commission, Electric Load Serving Entities (IOU & POU) service-territory map. Checked September 23, 2026.

    Before you compare proposals

    The Modesto project checks that change the decision

    Modesto Irrigation District customers are not on PG&E's Solar Billing Plan: MID says it still offers only NEM 2.0 and sets its own export credit and size cap, so a quote should be built on MID's terms.

    Ask the same three questions

    1. Is the system sized within MID's limit of 115 percent of the meter's annual demonstrated load?
    2. Does the quote carry MID's $900 interconnection fee for a system under 100 kW AC as well as the City's $333 permit?
    3. Does the savings estimate value exported energy at the 7.6 cents per kWh MID credits, rather than at a PG&E export rate?

    Local checks

    One flat City line

    The City's 2026-27 Building Safety fee table lists the residential electrical photovoltaic permit at $333.00, payable when the application is filed.

    MID's paperwork comes first

    MID wants a complete application package, including CSI sheets for each array and a battery data sheet if a battery is part of the job, plus the interconnection fee. It returns incomplete packages to the contractor by mail and says its first paperwork review takes one to three weeks.

    Then the MID inspection

    After the City signs off the permit, the signed-off copy goes to MID at pv@mid.org, dated within six months, and MID says it normally performs its interconnection inspection within 12 working days.

    South of the river, check your bill

    MID describes its service area as greater Modesto north of the Tuolumne River, and the California Energy Commission's map puts part of the city inside the Turlock Irrigation District's territory. A TID address follows TID's solar rules instead.

    Related decisions

    Local sources and limits
    • City of Modesto — Building Safety Fees (effective July 1, 2026 to June 30, 2027) — verified 2026-09-23. Electrical Photovoltaic - Residential $333.00 per permit, due at time of application; Electrical Photovoltaic - Commercial $1,098.00 deposit.
    • Modesto Irrigation District — Solar — verified 2026-09-23. MID currently offers only NEM 2.0; energy pushed back to MID’s grid is credited at 7.6 cents per kWh as a negative amount on the monthly bill; system size capped at 115% of the meter’s annual demonstrated load; interconnection fee $900 under 100 kW AC per meter ($1,800 at or above); initial paperwork review 1-3 weeks; signed-off City/County permit sent to pv@mid.org; MID interconnection inspection normally within 12 working days.
    • Modesto Irrigation District — Who We Are — verified 2026-09-23. MID’s electric service area: greater Modesto north of the Tuolumne River, Waterford, Salida, Mountain House and parts of Ripon, Escalon, Oakdale and Riverbank. Manteca is not named.
    • California Energy Commission — Electric Load Serving Entities (IOU & POU) service-territory layer — verified 2026-09-23. Overlaid on the Census TIGERweb city boundary to see which utility territories fall inside the city. A map layer, not an address lookup: the bill names the utility for a given home.
    • California Energy Commission — Residential Solar Permitting Program data (SB 379) — verified 2026-09-23. Self-reported platform status per jurisdiction, data last updated August 3, 2026; the CEC says it does not certify compliance. Rows used: Chico (deadline Sept 2023) and Arcata (deadline Sept 2024), both without a platform; Pasadena, Anaheim, San Jose and Tracy (custom platform); Santa Clarita, Vallejo, Corona and Ontario (Symbium); Escondido, Monterey, Modesto, Mountain View and Huntington Beach (SolarAPP+).

    Before you sign

    In Stanislaus County the middle half of reported costs spans $2.71 to $3.96 per watt, and roof, panel work, equipment and contract terms explain most of that gap. California Solar Tax and Permit Rules for 2026 covers them, and the tax, lease and disclosure rules a Modesto contract follows.

    Frequently asked questions

    How much does solar cost in Modesto?

    About $22,600 for a 6.8 kW system, at the $3.32 per watt median that Stanislaus County owners reported (240 systems, January 2025 to May 2026; middle half $2.71 to $3.96). Source: CPUC DG Stats. No federal credit applies to a Modesto system finished in 2026.

    What does a solar permit cost in Modesto?

    $333 for a home rooftop system on Modesto's published schedule (checked September 23, 2026); the state limit is $450 up to 15 kW under Gov. Code §66015.

    How does MID treat rooftop solar in Modesto?

    Where the Modesto Irrigation District serves the address, MID, not PG&E, sets the solar terms. MID says it currently offers only NEM 2.0 and credits energy a system pushes back to its grid at 7.6 cents per kWh, shown as a negative amount on the monthly bill. It caps a system at 115 percent of the meter's annual demonstrated load, charges a $900 interconnection fee for a system under 100 kW AC per meter, and says it normally performs its interconnection inspection within 12 working days.

    Which utility serves Modesto?

    The Modesto Irrigation District describes its electric service area as including the greater Modesto area north of the Tuolumne River, and the California Energy Commission's service-territory map places part of Modesto in the Turlock Irrigation District's territory. Neither is PG&E. Read the utility name on your bill before using either district's rates or solar rules. Where MID serves the address, no comparable average residential rate is published for it on the tracker.

    Sources

    The tax, contract and permit rules every California city shares, with their statutes: California Solar Tax and Permit Rules for 2026.

    Modesto in the California Solar Cost IndexIts permit fee, permit platform and utility beside every other city's.Compare solar companies in ModestoWho installs in Modesto and what each written proposal should include.

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