Mirasol · Los Cabos
Yes — but the math looks different from what most solar companies are still quoting. The DAC rate is high enough (~$0.30 USD/kWh) that even 45% direct self-consumption from a well-sized system cuts a $400/month bill by more than $100. With battery storage, that rises to over $200. DAC is the rate you hit when your 12-month rolling average exceeds ~850 kWh/month — in Los Cabos, summer A/C alone can push most homes past that. We show the actual numbers.
Quick view
Mexico eliminated 1:1 net metering in 2025 but the DAC rate is still the strongest solar case in Los Cabos. Here's the honest math for DAC homeowners.
Without battery, most Los Cabos homes directly consume between 40% and 50% of the solar energy produced. The rest is exported to the CFE grid at PML spot price, which in BCS can be near zero. Quotes that ignore this are using old net metering math.
Distribution charges, the minimum monthly charge, and local taxes remain on the bill even if the system covers 100% of your energy consumption. Any honest return calculation needs to subtract these from projected savings.
With a battery lifting self-consumption to 85%, energy savings rise to 85% × 600 kWh × 6 MXN = $3,060 per month. That approaches the original net metering promise — but achieved with your own storage rather than grid credits.
A 10–15 kWh battery stores midday solar production for afternoon and evening use. That shift raises self-consumption from ~45% to ~85% and captures value that would otherwise be exported at near-zero price.
The honest math
The old calculation assumed all system production offset the bill: 600 kWh produced × 6 MXN/kWh = $3,600 in savings. The honest calculation starts from real self-consumption: 45% × 600 kWh × 6 MXN = $1,620 in energy savings, plus the CFE minimum charge (~$215/month) that remains regardless. For a $400/month DAC bill with a 5 kW system, the real savings without battery is meaningful but different from what most quotes show.
Without battery, most Los Cabos homes directly consume between 40% and 50% of the solar energy produced. The rest is exported to the CFE grid at PML spot price, which in BCS can be near zero. Quotes that ignore this are using old net metering math.
Distribution charges, the minimum monthly charge, and local taxes remain on the bill even if the system covers 100% of your energy consumption. Any honest return calculation needs to subtract these from projected savings.
With a battery lifting self-consumption to 85%, energy savings rise to 85% × 600 kWh × 6 MXN = $3,060 per month. That approaches the original net metering promise — but achieved with your own storage rather than grid credits.
Battery with DAC
With battery storage and 85% self-consumption, the same 5 kW system generates roughly $3,060 in monthly energy savings, plus a reduction in demand-based variable charges. The net result is much closer to the original net metering promise, but using storage instead of grid credits.
A 10–15 kWh battery stores midday solar production for afternoon and evening use. That shift raises self-consumption from ~45% to ~85% and captures value that would otherwise be exported at near-zero price.
DAC is calculated on a rolling 12-month average. A well-sized system with battery reduces your monthly consumption faster than one without storage, accelerating your exit from the DAC threshold if you're anywhere near the limit.
Without battery, payback for a typical DAC home in Los Cabos is 5–7 years with competitive financing. With battery, it extends 1–2 years due to added cost, but annual savings are significantly higher and outage protection adds value that the numbers don't fully capture.
Why DAC is the best candidate
Even with conservative self-consumption assumptions, a DAC homeowner saves more per kWh than any other customer type because they're paying the highest rate. The incentive is proportional to the pain: if you pay 6 MXN/kWh, every kWh you avoid is worth 6 MXN. A home just below the DAC threshold on the standard 1C rate pays between 1 and 3 MXN/kWh — the same panel produces the same kWh, but it's worth three times less.
At 6 MXN/kWh (~$0.30 USD), a system saving 300 kWh/month generates $1,800 MXN (~$90 USD) in monthly energy savings. The same system at the standard 1C rate (average 2 MXN/kWh) generates $600 MXN. The DAC rate turns a modest system into a clear economic argument.
A home consuming 600 kWh/month on the standard 1C rate pays roughly $1,200–1,800 MXN. The same consumption under DAC can cost $3,600–4,800 MXN. Solar reduces that difference proportionally — but the absolute savings under DAC are far larger.
For a $400/month DAC home with a 5 kW system and no battery, breakeven is 5–7 years with competitive financing. With battery and monthly savings of $150+, the timeline is similar but total 10-year savings are considerably higher.
What to ask for
Any serious quote must show three numbers separately: the self-consumption ratio assumed, the CFE charges that remain after the system, and results with and without battery. Any quote that only shows gross system production versus your current bill is using net metering math that no longer applies.
Ask directly: what self-consumption percentage does this quote assume? If they can't answer or say 100% of production offsets the bill, they're calculating with net metering.
Ask for the estimated bill after installation, not just the savings. Minimum charges, distribution fees, and taxes don't disappear even if the system generates all your energy.
Require both scenarios. The difference between 45% and 85% self-consumption is the difference between a system that barely covers its cost and one that generates real savings from year one.
FAQ
A DAC home with a $400/month bill and a 5 kW system can save $75–100/month without battery (45% self-consumption) and $140–180/month with battery (85% self-consumption). Exact savings depend on consumption pattern, system size, and the fixed CFE charges that remain on the bill.
Yes. A battery lifts self-consumption from ~45% to ~85%, nearly doubling monthly energy savings. The added battery cost extends payback by 1–2 years, but total 10-year savings are significantly higher than without storage.
Yes, if the system is properly sized and self-consumption is high. DAC is based on a rolling 12-month average: if you reduce your average monthly consumption below ~850 kWh in BCS, you'll exit DAC — though it takes several months to reflect. A battery accelerates the process.
For a primary residence in Los Cabos, 40–50% self-consumption without battery is realistic. With battery and some load scheduling (pool pump, water heater), that can reach 80–90%. Vacation rentals have different patterns and typically lower self-consumption.
It's likely using 1:1 net metering math that no longer applies after the 2025 reform. A quote that multiplies total system production by the DAC rate without applying a self-consumption percentage is overstating real savings. Ask for the assumed self-consumption ratio and the estimated post-installation CFE bill.
Sources
These sources help explain regional solar and CFE context. A final property quote still depends on the bill, roof, and technical visit.
Next step
With a recent CFE bill we can separate usage, tariff, charges, and solar potential before deciding whether to move forward.