Solar only vs solar plus battery in California 2026: what's actually better for your house?

Key takeaways

• If you're on SCE, PG&E, or SDG&E (under NEM 3.0), solar plus battery is almost always the right call in 2026. Solar-only stretches payback to 9-10 years.

• If you're on LADWP or a California municipal utility (still on 1:1 net metering), solar-only works well. A battery is optional and mostly for outage backup.

• Adding a Tesla Powerwall 3 battery typically costs $13,500-$22,500, and Enphase IQ 10C costs $13,000-$18,000. For IOU customers, that pays back in 3-5 years through NEM 3.0 arbitrage. For LADWP customers, payback is slower.

• The three-part test: What's my utility? Am I in a PSPS-prone area? Is my monthly bill over $250? Answer those, and the right config is usually obvious.

• The prepaid lease structure in 2026 lets you bundle solar plus battery and still capture 30% off the total through the commercial ITC. Ownership in 2026 doesn't capture that anymore.

Every homeowner asks this question, and every article answers it with some version of "it depends." Which is true but not useful. Here's the version that actually helps you decide. We install both solar installation with and without battery storage across LA County. We see the quotes, we run the numbers, and we watch the savings roll in (or not) over the first 12-24 months. The short answer: your utility determines most of it. On SCE, PG&E, or SDG&E, add a battery. On LADWP, solar-only usually wins. This guide walks through the full math, the edge cases, and how to decide what's right for your specific situation.

The 30-second decision tree

Three questions. Answer them in order. The answer is usually obvious by question 3.

Question 1: What's my utility?

SCE, PG&E, or SDG&E (investor-owned, on NEM 3.0): add a battery. The math doesn't work without one. LADWP, SMUD, Burbank, Glendale, Pasadena, or other municipal utility (still on 1:1 net metering): solar-only usually works well. A battery is optional.

Question 2: Am I in a PSPS or outage-prone area?

If yes (foothill neighborhoods, fire zones, SCE Santa Clarita/Antelope Valley, or canyon LA neighborhoods): consider adding a battery regardless of utility, for outage backup. If no (flat LA, dense suburbs with reliable power): battery decision is purely economic.

Question 3: Is my monthly bill over $250?

If yes: battery pays off faster and makes clear financial sense. If no (under $180/month): battery adds outage protection but the bill savings don't pay back the battery cost quickly. Solar-only is the better value pick.

Why NEM 3.0 changed everything

This is the foundational piece. Everything in the solar-only-vs-battery decision flows from what your utility's net metering rules are.

NEM 3.0 on SCE, PG&E, SDG&E

Under NEM 3.0, solar exports credit at the avoided cost rate: 5 to 8 cents per kWh on average. You pay 35 to 45 cents per kWh for grid power. That's a 4-to-5x gap. A battery captures your midday solar, stores it, and discharges during the 4-9 pm peak. Effectively, a battery converts 5-cent export credits into 40-cent bill offsets. For a 900 kWh household that's $1,200-$1,800 per year in additional savings over solar-only.

LADWP still has 1:1 net metering

If you're on 2026 LADWP, your solar exports credit at the retail rate. That means the battery arbitrage doesn't exist. You export at 22 cents, you buy at 22 cents, no gap to exploit. A battery on LADWP is mostly for outage backup, not bill optimization. Solar-only usually wins on LADWP.

The math in one line

On an IOU utility, the battery pays for itself through peak-hour arbitrage. On a municipal utility with 1:1 net metering, it doesn't. That's the whole story.

Payback and savings by utility, solar only vs solar plus battery

Here's how the math actually plays out by utility. These are ballpark numbers for a typical 7 kW system on a $250-350/month household, with one Tesla Powerwall 3 or equivalent battery if storage is included.

Utility + config	Installed cost	Avg annual bill savings	Payback period
SCE, solar only (7 kW)	$21k-$31.5k	$2,400-$3,400	9-10 years
SCE, solar plus battery (7 kW + 1 PW3)	$34k-$48k	$3,800-$5,400	7-8 years
LADWP, solar only (7 kW)	$21k-$31.5k	$2,600-$3,800	6-8 years
LADWP, solar plus battery (7 kW + 1 PW3)	$35k-$48k	$3,200-$4,600 + backup	8-10 years
PG&E, solar only (7 kW)	$21k-$31.5k	$2,800-$4,000	8-10 years
PG&E, solar plus battery (7 kW + 1 PW3)	$35k-$48k	$4,200-$5,800	7-8 years

Reading the payback numbers

Payback period measures when your cumulative savings equal your upfront cost. It's not the only metric that matters, but it's the most intuitive. After payback, the system keeps producing savings for another 15-20 years, all of which is pure win. A 7-year payback on a 25-year system means 18 years of free electricity. A 10-year payback means 15 years of free electricity. Both are good, but shorter is better if the upfront cost is comparable.

The utility-by-utility breakdown

Each California utility has its own specifics. Here's what we tell customers based on who serves their address:

Your utility	Solar-only?	Solar plus battery?	Our recommendation
SCE (NEM 3.0)	Works, 9-10 yr payback	7-8 yr payback, better lifetime	Solar plus battery
PG&E (NEM 3.0)	Works, 9-10 yr payback	7-8 yr payback, better lifetime	Solar plus battery
SDG&E (NEM 3.0)	Marginal, 10+ yr payback	7-9 yr payback	Solar plus battery (essential)
LADWP (1:1 NEM)	6-8 yr payback, strong ROI	7-9 yr payback, adds backup	Solar only unless PSPS-prone
Burbank Water (BWP)	6-8 yr payback, strong ROI	Similar timeline, adds backup	Solar only or small battery
Glendale Water (GWP)	7-9 yr payback	8-10 yr payback with battery	Solar only typically
SMUD (Sacramento)	6-8 yr payback	7-8 yr with battery rebate	Solar plus battery (SGIP active)

A note on SCE territory in 2026

SCE rates jumped 10-13% in 2026 and the CPUC has approved more increases through 2028. NEM 3.0 reduced export value. Together, solar-only economics on SCE have gotten harder to justify unless you have a very high bill or plenty of midday self-consumption (home during the day, pool pump, EV charging). For most 2026 SCE rate increase customers, solar plus battery is now the default recommendation.

A note on LADWP territory

LADWP is the opposite story. 1:1 net metering is still in effect as of April 2026. Solar-only payback is 6-8 years. A battery adds outage protection but doesn't meaningfully accelerate payback. In most LADWP neighborhoods, solar-only is the better spend. The exception: homes in canyon neighborhoods (Sunland-Tujunga, Chatsworth foothills, Mount Washington) where PSPS events happen. For those addresses, add a battery for backup.

When a battery is worth it, even on LADWP

Even in a utility where the bill-economics math doesn't strongly favor a battery, there are specific scenarios where adding one still makes sense.

You're in a PSPS or outage-prone area

Battery as backup is insurance, not bill-offset arbitrage. A Tesla Powerwall 3 at 13.5 kWh covers 24-30 hours of essentials. On LADWP, that's protecting your fridge, WiFi, lights, and maybe the AC during an unplanned outage. Homeowners who've lost power during a Santa Ana wind event or a neighborhood transformer failure know the peace-of-mind value is real. We'd add a battery for PSPS-prone homes regardless of the utility.

You have critical medical equipment or work-from-home priorities

If a 3-hour outage means losing a CPAP machine, home office productivity, or refrigerated medications, battery backup is essential infrastructure, not a financial optimization. Size the battery to cover your must-run loads for the expected outage duration in your neighborhood.

You want to hedge against LADWP policy changes

LADWP's 1:1 net metering could change at any time via a Board decision (as the CPUC did for IOUs in 2023). Current systems are typically grandfathered, but new systems interconnected after a policy change would face new rules. Adding a battery now is a hedge: if LADWP goes to an avoided-cost model, your battery is ready to capture the arbitrage. If 1:1 stays, you've got backup protection.

You plan to add an EV or heat pump

Significant new loads change the math. If you're planning to add an EV charger (which can add 3,000-5,000 kWh/year of consumption) or a heat pump (similar or bigger increment), a battery helps you dispatch solar to cover the new loads instead of pulling expensive peak-hour grid power. For heavily electrified homes, battery makes sense even on LADWP because your utility bill stops being small enough to ignore.

When solar only is the better choice

The flip side: scenarios where adding a battery doesn't make sense regardless of utility.

You have a low bill (under $180/month)

The upfront battery cost ($13,500-$22,500 for one Powerwall 3 or equivalent) doesn't pay back quickly on a small bill. What solar-only can offset depends on your utility. LADWP customers still see most of an average bill covered by panels alone, since exports are credited close to the retail rate. SCE, PG&E, and SDG&E customers fall under NEM 3.0, where export credits dropped to roughly a quarter of retail — which is why solar-only typically covers around 60% of annual usage on those utilities, and a battery starts to make financial sense rather than just being backup. 

You're moving within 5-7 years

Battery payback periods are 7-9 years in the IOU scenarios we modeled above. If you're selling the house before then, you don't capture the full payback. Solar by itself adds resale value; a battery adds less proportionally. For short-hold situations, solar-only is the better ROI move.

You don't need outage backup

If you live in a dense suburb where the power goes out once every 2-3 years, battery backup is a luxury. The money is better spent on more solar panels, a heat pump, or an EV charger, depending on your goals.

How the prepaid lease path changes the math in 2026

The residential 30% federal tax credit expired December 31, 2025. For 2026 installs, the path to the 30% is now through a prepaid lease structure that captures the commercial §48E credit. This applies to solar plus battery combined. A $45,000 solar-plus-battery install via prepaid lease becomes effectively $31,500 after the 30% is passed through. That materially changes the payback math. Cash purchase in 2026 doesn't get the 30%. Prepaid lease does. For most 2026 buyers considering solar plus battery, prepaid lease is the financially stronger structure.

Which battery to pick if you decide to add one

If you decide to go solar plus battery, the battery selection is its own decision.

Frequently asked questions

Do I need a battery if I have solar in California?

On SCE, PG&E, or SDG&E, practically yes. NEM 3.0 makes solar-only economics weak. On LADWP or a municipal utility with 1:1 net metering, no, solar-only works fine. The utility is the deciding factor.

How much does adding a battery to solar cost?

$13,500-$22,500 additional for a single Powerwall 3 (13.5 kWh), or $13,000-$18,000 for a single Enphase IQ Battery 10C (10 kWh). Bigger systems or more capacity runs proportionally higher. Per kWh installed cost is roughly $1,000-1,500.

Does a battery pay for itself?

On NEM 3.0 utilities, yes: 3-5 year incremental payback through peak-hour arbitrage. On 1:1 net metering utilities (LADWP, BWP, PWP, GWP), slower or never purely on bill savings, but the outage backup value is real. On SMUD, yes, because of battery-specific rebates.

Can I add a battery to existing solar later?

Yes. Both Tesla Powerwall 3 and Enphase IQ Battery 10C can retrofit to existing solar. Cost is about 15-25% higher than including the battery in the original install because of additional mobilization, wiring, and permit fees. If you think you'll want a battery someday, adding it with the original solar saves money.

Will adding a battery affect my NEM 2.0 grandfathering?

No, adding battery storage alone doesn't affect NEM 2.0 status. But if you also add more solar panels as part of the battery project and those panels exceed 110% of your existing system size or add more than 1 kW, you'll get moved to NEM 3.0 for the entire system. Smart expansion: battery only, don't touch the PV.

Is solar-only ever better than solar plus battery?

Yes. On LADWP and similar 1:1 net metering utilities, if you don't have outage concerns and you don't have medical or critical-load backup needs, solar-only gives better payback. The $15,000-$22,500 you'd spend on a battery could instead cover more solar panels, an EV charger installation, or a heat pump conversion. For LA proper homeowners on LADWP, solar-only is usually the right call.

What if I'm moving in 3 years?

Solar-only makes more sense than solar plus battery. Solar adds $15,000-$20,000 to home resale value according to Lawrence Berkeley National Laboratory research. A battery adds less proportionally. If you're not going to recoup the battery payback period, skip it and just do solar.

The bottom line on solar only vs solar plus battery

For SCE, PG&E, and SDG&E customers in 2026, add a battery. Solar plus battery has become the standard recommendation under NEM 3.0, with 7-8 year payback periods and strong ongoing savings. For LADWP and California municipal utility customers, solar-only still makes economic sense, and a battery is optional (mostly for PSPS backup in canyon/foothill neighborhoods). The utility determines most of this decision. If you want us to run both configurations for your specific address using your 12 months of utility data, we'll model them side by side so you can see the real numbers before committing. See our full California solar cost guide for the pricing context and solar economics for the finance math.

Not sure if you should add a battery?

We'll run the NEM 3.0 or LADWP math for your specific address, model both solar-only and solar-plus-battery, and show you payback periods for each. Free, no pressure. CSLB-licensed.

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