Does Solar Mean Free Electricity in California?

The short answer: no, and here's the mechanism

Solar offsets volumetric energy consumption — the per-kWh charge for electricity you use. It does not remove the fixed and non-bypassable components layered underneath that volumetric charge, and it does not change your status as a utility customer of record. The CPUC states this in plain terms in its Solar Consumer Protection Guide: the claim that you'll never pay a bill again is listed as a false claim to watch for, and the guide sets the expectation instead at "a reduced electricity bill every month."

Think of your California electric bill as two stacked pieces. The first is volumetric — cents per kWh for what you draw from the grid, and this is the piece solar attacks directly, sometimes cutting it 60–90%+ depending on system size, usage pattern, and how much of your consumption happens after dark. The second piece is fixed and semi-fixed — charges that exist because you're interconnected to the grid at all, independent of how many electrons you personally imported this month. Solar has essentially no effect on the second piece. Any contractor or salesperson who tells you otherwise is contradicting the CPUC's own consumer guidance, not just being optimistic.

What solar actually offsets — and the export-credit catch

When your panels produce more than your house is using in that moment, the excess flows to the grid and you get a credit. Under the pre-2023 NEM framework, that credit was pegged close to the retail rate you'd otherwise pay — a near 1:1 trade. That changed on April 15, 2023, when the CPUC's Net Billing Tariff (adopted under Decision D.22-12-056) became the rule for all new interconnection applicants at PG&E, SCE, and SDG&E.

Under the Net Billing Tariff, your export credit is set by an avoided-cost calculation reflecting the value of that generation to the grid at that hour — and the CPUC's own description says this is "usually" lower than the retail rate, though it can exceed retail on late summer evenings when the grid needs power most. There's no single statewide export rate; it varies by utility, month, and hour. The upshot: a kWh you export at 1pm and a kWh you import at 7pm are not a wash anymore. That gap is one of the two biggest reasons post-2023 solar economics look different from a system installed in 2019 or 2020, which — if interconnected before the cutover — keeps its NEM 2.0 credit structure for 20 years from the interconnection date under Decision D.14-03-041, the standard net-metering tariff decision that Public Utilities Code § 2827.1(b) directed the CPUC to adopt by December 31, 2015.

Non-bypassable charges: the part solar cannot touch

Every bundled California investor-owned-utility customer pays four charges the CPUC itself labels non-bypassable: the Department of Water Resources bond charge, the Public Purpose Programs surcharge, the Nuclear Decommissioning charge, and the Competition Transition Charge. They're named directly on the CPUC's Net Energy Metering and Net Billing page. Each funds a specific statewide obligation — a bond issued during the 2001 energy crisis, low-income and energy-efficiency programs, decommissioning reserves for retired nuclear plants, and remaining transition costs from utility restructuring in the 1990s — and by design, self-generation doesn't exempt you from them.

What changed under the Net Billing Tariff is how these charges get applied to a solar household. Under NEM 2.0, non-bypassable charges were assessed against your net grid usage in each billing interval — meaning if you exported more than you imported in a period, you could reduce your NBC exposure. Under the current Net Billing Tariff, the CPUC's page describes these charges as applying to all energy imports rather than being netted that way, so a solar customer today pays non-bypassable charges on every kWh pulled from the grid, independent of what got exported. We could not pull the specific cents-per-kWh figure for each individual charge from a primary tariff sheet in this pass — if you want the exact number, it's on the rate schedule pages of your own utility, not a fixed statewide figure we'd feel comfortable printing without that verification.

The minimum bill and the income-graduated fixed charge

Two separate mechanisms put a floor under a solar customer's bill at PG&E, SCE, and SDG&E, and we want to be precise about what we can and can't confirm here.

First, net billing customers are subject to a minimum monthly bill built into CPUC rate-design decisions — a mechanism that traces to the Commission's Residential Rate Reform proceeding (R.12-06-013) and was carried forward into net-billing-specific implementing decisions. The specific dollar figure lives in those CPUC decisions and current utility tariff sheets, not in a single statute section — we were not able to confirm today's exact number against a primary source in this pass, so rather than repeat a figure that might be stale, we're telling you plainly: check the "minimum bill" or "minimum charge" line on your own utility statement, or ask your utility directly, before assuming any number you've seen quoted elsewhere.

Second, and separately, CPUC Decision D.24-05-028 — adopted May 15, 2024, in Rulemaking R.22-07-005 — authorized PG&E, SCE, and SDG&E to add an income-graduated fixed monthly charge to every residential bill — solar and non-solar alike — under the mandate of AB 205 (2022), on top of the usual volumetric rate. This charge is decoupled from how much electricity you use or export; it's set by income tier. We're not printing specific dollar amounts by tier here because we could not verify the currently adopted figures against a primary CPUC decision in this pass. The mechanism matters more than the exact number for this article's purpose: it's a second bill-floor component that solar production doesn't move.

Why you stay a utility customer no matter how much you produce

Net metering and net billing are tariffs offered by your incumbent utility — not a separate service that replaces it. When you go solar and interconnect to PG&E, SCE, SDG&E, or a public utility, you remain metered by that utility, billed monthly by that utility, and subject to that utility's non-bypassable charges, minimum bill, and (for the three IOUs) the income-graduated fixed charge. There is no current CPUC mechanism for a residential net-billing customer to disconnect from utility billing while staying connected to the grid.

This is also why system size is capped rather than left to the homeowner: under the Net Billing Tariff, a new system can't be sized above 150% of your trailing 12 months' usage. You can't oversize your way into a zero bill by generating a large surplus, because the interconnection rules don't allow it, and any surplus beyond your bill credits is compensated at a net surplus rate around $0.02–$0.03/kWh — nowhere close to the retail rate you're paying to buy power back.

Publicly owned utilities play by different rules

The CPUC's NEM/Net Billing Tariff framework — and the AB 205 income-graduated fixed charge — apply only to investor-owned utilities: PG&E, SCE, SDG&E, and a few smaller ones like Bear Valley. LADWP, SMUD, MID, Anaheim, Roseville, Lodi, Imperial ID, and Turlock ID are municipal or public utility districts governed by their own boards, not CPUC decisions. That means the specific mechanics in this article — the Net Billing Tariff's avoided-cost export rate, the 150% sizing cap, the income-graduated fixed charge — do not automatically apply to a POU customer. Each POU sets its own net metering terms, and they can differ meaningfully from utility to utility and from the IOU framework described above.

What carries over regardless of utility type is the basic principle: solar offsets usage, and any fixed or minimum charge your utility applies is unlikely to be affected by your production. If you're a POU customer, the right move is to pull your specific utility's net metering rules directly rather than assuming the CPUC rules above apply to you.

What a realistic post-solar bill looks like, by utility

The single biggest driver of your post-solar bill size is your utility's per-kWh rate, because that rate sets both what you save on offset usage and what you pay on any import solar didn't cover. At current approximate residential rates, SDG&E customers ($0.457/kWh) get the most value per offset kWh and also pay the most for every kWh solar didn't cover; PG&E ($0.415/kWh) and SCE ($0.345/kWh) sit below that; public utility customers on SMUD ($0.19/kWh), MID ($0.17/kWh), or LADWP ($0.27/kWh) see smaller swings in both directions because their per-kWh rate is lower to begin with.

Layer in the mechanics above and a realistic expectation looks like this: at PG&E, SCE, or SDG&E, expect your bill to drop substantially but never to zero, with non-bypassable charges, a minimum bill floor, and the income-graduated fixed charge as the permanent baseline, plus any import cost for usage solar didn't cover — heavier in winter and after dark. On a POU like LADWP, SMUD, or MID, expect a similar shape (a real reduction, not elimination) but built from that utility's own fixed-charge structure rather than the CPUC's framework — worth confirming directly with your utility since we can't apply the IOU-specific figures to a POU account.