When California implemented Net Energy Metering 3.0 (NEM 3.0) in April 2023, it fundamentally changed the economics of residential solar. Under the old NEM 2.0 rules, solar panels alone were a great deal — you could export surplus daytime electricity to the grid and get credited at near-retail rates. Under NEM 3.0, that export credit dropped by roughly 75%.
The result: solar panels alone still save money, but adding battery storage now makes a much bigger difference in your actual monthly savings. This article explains why, how the numbers work, and when adding a battery makes financial sense for California homeowners.
1. What NEM 3.0 Changed
NEM 2.0 (the previous system) worked like a simple trade: when your panels produced more electricity than you used, the surplus went to the grid and you received a credit at roughly the retail rate — meaning each exported kWh was worth about as much as each kWh you bought. Your meter effectively "ran backwards."
NEM 3.0 changed two critical things:
1. Export compensation dropped dramatically
Under NEM 3.0, the credit you receive for electricity sent to the grid is based on the "avoided cost" to the utility — which is a fraction of the retail rate. Depending on the time of day, export credits can be as low as 4-8 cents per kWh, compared to the 30+ cents you pay to buy from SCE. This means exporting surplus solar is worth far less than it used to be.
2. Time-of-Use pricing became mandatory
All NEM 3.0 solar customers are placed on Time-of-Use (TOU) rate schedules, where the price of electricity varies by time of day. The most expensive hours are typically 4 PM to 9 PM — exactly when solar panels are producing less or nothing. This means the electricity you need most (evening peak) costs the most, and the electricity your panels produce most (midday) is worth the least for export.
The net effect: without a battery, a significant portion of your solar production gets exported at low value during the day, and you still buy expensive electricity from SCE during peak evening hours. The battery solves this mismatch.
2. Time-of-Use Rates Explained
SCE's TOU rate schedule divides the day into pricing tiers. The exact rates depend on your specific plan, but the general structure for residential customers looks like this:
Notice the problem for solar: panels produce the most electricity between roughly 9 AM and 3 PM (off-peak, lower rate). But the most expensive electricity — the peak period from 4 PM to 9 PM — is when panels produce little or nothing (especially after sunset).
Without a battery, you export cheap midday solar and then buy expensive peak electricity. With a battery, you store midday solar and use it during peak hours — effectively turning 25-cent power into 50-cent value.
3. Export Compensation Under NEM 3.0
Under NEM 3.0, the value of exported solar depends on when you export it. The CPUC established "Avoided Cost Calculator" values that fluctuate by month and time of day. In general terms:
Compare these export credits to what you pay to buy electricity from SCE during peak hours (45-55 cents per kWh) and the arbitrage is obvious. Every kWh you store in a battery instead of exporting saves you roughly 35-45 cents compared to the export-and-rebuy cycle.
This is why NEM 3.0 made batteries economically essential. Under NEM 2.0, batteries were a nice-to-have for backup power. Under NEM 3.0, they are a core part of the financial equation.
4. How Batteries Change the Math
A home battery (typically 10-15 kWh capacity, like the Tesla Powerwall or Enphase IQ Battery) stores solar electricity produced during the day and discharges it during peak hours. Here is how that changes your daily energy flow:
Morning (6 AM - 10 AM)
Solar begins producing. Home loads are served first, then surplus starts charging the battery.
Midday (10 AM - 4 PM)
Peak solar production. Battery charges fully. Any remaining surplus exports to the grid (at low NEM 3.0 rates — but less surplus is wasted because the battery absorbs most of it).
Peak Hours (4 PM - 9 PM)
Solar production drops. Battery discharges to power your home instead of buying from SCE at peak rates (45-55 cents/kWh). This is where the real savings happen.
Night (9 PM - 6 AM)
Battery may still have charge for overnight use. Any remaining demand comes from SCE at super off-peak rates (the cheapest time).
The battery acts as a time-shift device: it moves your solar production from when it is least valuable (midday) to when electricity is most expensive (peak evening). This arbitrage is the core economic driver of home battery storage under NEM 3.0.
5. Battery Economics: Is It Worth It?
A home battery adds approximately $8,000 to $15,000 to the cost of a solar installation (before any tax credits). For bought systems, the 30% federal tax credit applies to the battery cost as well, reducing the net investment to roughly $5,600 to $10,500.
The financial benefit depends on how much peak-hour electricity the battery displaces. For a typical Temecula home:
Battery Savings Estimate (13.5 kWh Battery)
As SCE peak rates continue rising (see our SCE rate increase breakdown), the value of peak-hour displacement increases every year. A battery that saves $1,200 per year today might save $2,000+ per year by 2030 as peak rates climb. This accelerating value makes batteries one of the best investments in a NEM 3.0 world.
6. Batteries With a PPA
If you go the PPA route with Freedom Forever, a battery can be included in your system at no additional upfront cost. The battery's cost is incorporated into your PPA rate and the installer handles all maintenance and monitoring.
The benefit is straightforward: the battery allows your PPA system to offset more of your peak-hour usage, which means a larger portion of your electricity comes from the PPA (at a lower rate) instead of from SCE (at peak TOU rates). This results in higher total monthly savings compared to a PPA without battery storage.
For a detailed comparison of PPA with and without battery, or PPA versus buying outright, see our PPA vs buying guide. Your personalized proposal from Adrian will include battery recommendations specific to your home and usage pattern.
7. Backup Power During Outages
Beyond the financial benefits, batteries provide backup power during grid outages. This is relevant for Temecula-area homeowners because:
- SCE Public Safety Power Shutoffs (PSPS) can last 24-48 hours during high fire-risk conditions
- Summer heat waves strain the grid, leading to rolling blackouts (as happened in 2020)
- Severe weather events can knock out power for extended periods
- Without a battery, solar panels cannot power your home during a grid outage (they shut off for utility worker safety)
A battery with backup capability keeps your essential circuits running — refrigerator, lights, Wi-Fi, phone chargers, and potentially HVAC — during an outage. A typical 13.5 kWh battery can power essential loads for 10-24 hours depending on usage. If the outage occurs during daylight, your solar panels continue charging the battery, potentially extending backup indefinitely.
8. Should You Add a Battery?
For most California homeowners going solar in 2026, the answer is yes. Here is the decision framework:
Battery Makes Strong Sense If:
- You are on a TOU rate schedule (all NEM 3.0 customers are)
- Your peak-hour usage is significant (AC, cooking, EV charging in evening)
- You live in an area with PSPS outage risk
- You want to maximize monthly savings under NEM 3.0
- You are going PPA and it can be included at no upfront cost
Battery Is Less Critical If:
- Your home is mostly unoccupied during peak hours
- Your electricity usage is very low overall
- Budget is extremely tight and you are buying (not PPA)
- You are grandfathered into NEM 2.0 (existing solar customers)
For Temecula specifically, the combination of high summer temperatures (driving evening AC usage), the inland fire risk (PSPS events), and SCE's steep peak rates makes batteries especially beneficial. Most new solar installations in the area include battery storage.
Want to see what solar plus battery savings look like for your specific home? Use our savings calculator or call Adrian at (951) 290-3014 for a full custom proposal. Learn more about the company behind the installation in our Freedom Forever review.