Do You Live in an SDG&E High Fire Threat District? Backup Power for Poway, Rancho Bernardo, Scripps Ranch and Rancho Santa Fe

Some San Diego neighborhoods see power shutoffs that coastal homes never do. Here is how to find out whether your address is in the High Fire Threat District, what that means for outages, and how to size backup power for a larger inland home.

https://www.youtube.com/watch?v=pgIxdon_rew

Key takeaways

• The CPUC’s statewide fire threat map rates areas Tier 2 (higher risk) or Tier 3 (extreme risk). Together with Tier 1 High Hazard Zones, they make up the High Fire Threat District.
• You can look up your address on the CPUC’s interactive Fire Threat Map. Tier lines don’t follow city limits or ZIP codes.
• Homes in or near the HFTD are more likely to see SDG&E power shutoffs, and some qualify for SDG&E’s Generator Assistance Program.
• Larger inland homes can choose partial backup for essentials or whole-home backup, and a Powerwall 3 system can grow to as many as seven units.
• Solar recharging is what turns hours of battery backup into days.

Frequently asked questions

What is an SDG&E High Fire Threat District?

The High Fire Threat District (HFTD) is made up of Tier 2 (higher risk) and Tier 3 (extreme risk) areas on the CPUC’s statewide fire threat map, along with Tier 1 High Hazard Zones from the state’s tree mortality map. Utilities apply stricter safety rules there, and they’re the areas where SDG&E is most likely to shut off power during Santa Ana winds.

How do I find out if my home is in Tier 2 or Tier 3?

Open the CPUC’s interactive Fire Threat Map, click the magnifying glass icon, type your address and look at the shading around your home. Check your own address rather than your neighbor’s, because two homes in the same neighborhood can land in different zones.

Are Poway, Rancho Bernardo and Scripps Ranch in the High Fire Threat District?

Parts of these communities sit near or inside fire-threat areas, which is why they see shutoff watches that coastal neighborhoods rarely do. In early October 2026, SDG&E named Poway and Ramona among the areas that could see shutoffs. Tier boundaries vary, so look up your exact address.

Does living in the HFTD qualify me for help with backup power?

It can. SDG&E’s 2026 Generator Assistance Program offers rebates toward a fuel generator or portable power station to customers in Tier 2 or Tier 3 areas who have experienced at least one PSPS.

Can a home battery back up a well pump or central air?

Yes, if the system is designed for it. The Powerwall 3 is rated for motor starting current (185 A locked rotor, per Tesla’s datasheet), but large loads like central air and pool pumps drain the battery faster, so your installer should check each motor load against the design.

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Ask someone in Carlsbad about a Public Safety Power Shutoff and you may get a blank look. Ask someone east of the I-15 and you’ll probably hear about the last time the alert came in. The difference isn’t luck. It’s geography, and it’s written down on a state map most homeowners have never looked at.

What the High Fire Threat District map is

The California Public Utilities Commission adopted its statewide fire threat map on January 19, 2018. It was developed by a utility mapping panel and reviewed by an independent team chaired by CAL FIRE. The map sorts areas served by overhead power lines into tiers:

• Tier 2: areas at higher risk from utility-associated wildfires
• Tier 3: areas at extreme risk

Tiers 2 and 3, along with Tier 1 High Hazard Zones from the state’s tree mortality map, make up the High Fire Threat District, or HFTD. Utilities apply stricter safety rules in these zones, and they’re the areas where SDG&E is most likely to de-energize lines during Santa Ana winds. The CPUC explains the map on its fire threat maps page.

How to look up your address

The CPUC publishes an interactive Fire Threat Map. Open it, click the magnifying glass icon, type your address and look at the shading around your home. Tier boundaries don’t follow city limits or ZIP codes, so two homes in the same neighborhood can land in different zones. Check your own address rather than your neighbor’s.

Why inland neighborhoods carry more risk

Inland North County and the I-15 corridor sit where Santa Ana winds funnel through canyons into chaparral-covered hills. That’s the setting for two of the largest fires in county history:

• The 2003 Cedar Fire burned more than 280,000 acres and destroyed 2,820 buildings. Within the City of San Diego, Scripps Ranch and Tierrasanta were hit hardest.
• The 2007 Witch Creek Fire, which merged with the Guejito Fire, burned nearly 198,000 acres, moving through Ramona, Rancho Bernardo and Poway toward Rancho Santa Fe. All 365 homes lost inside the City of San Diego were in Rancho Bernardo.

That history is why so many homeowners in Poway, Rancho Bernardo, Scripps Ranch, Rancho Santa Fe, Rancho Peñasquitos and Carmel Valley ask about battery backup installation. Parts of these communities sit near or inside fire-threat areas, and in early October 2026 SDG&E named Poway and Ramona among the areas that could see shutoffs.

What being in or near the HFTD means for you

• Shutoffs are more likely. SDG&E’s Public Safety Power Shutoffs target circuits in high-risk areas. Alerts typically start about 48 hours ahead, and shutoffs can run from several hours to multiple days.
• You may qualify for help with backup power. SDG&E’s 2026 Generator Assistance Program offers rebates toward a fuel generator or portable power station to customers in Tier 2 or Tier 3 areas who have experienced at least one PSPS.
• Planning ahead pays off. A battery installed before fire season is ready for the first watch notice. One installed in the middle of it may not be.

Backup for larger inland homes

Homes in Poway, Rancho Santa Fe and Rancho Bernardo often have bigger loads than a typical coastal house: central air, pool equipment, EV chargers, and on some rural lots, a well pump. That changes how backup should be designed.

Start by choosing what to back up. There are two approaches:

• Partial backup puts essential circuits (refrigerator, lights, internet, a few outlets, a well pump) on a dedicated backup panel. It stretches a battery further.
• Whole-home backup keeps everything on the battery. Tesla says a Powerwall 3 system can provide whole-home backup to most homes, but large loads like pool pumps and central AC will drain it faster.

Then size the storage. Each Tesla Powerwall 3 stores 13.5 kWh and delivers up to 11.5 kW continuously, with a built-in solar inverter that lets your panels recharge it during the day. A single system can grow to as many as seven units (up to four Powerwall 3s plus up to three Powerwall 3 Expansions), which gives a large home room to cover a multi-day shutoff. Tesla’s system design guide walks through the options.

Motor loads deserve a look. Well pumps and air conditioners draw a surge when they start. The Powerwall 3 is rated for that kind of starting current (185 A locked rotor, per Tesla’s datasheet), but your installer should check each motor load against the design rather than assume.

Solar is what makes it multi-day. Without panels, a battery is a countdown. With them, every sunny day of the shutoff refills the battery, which is why inland homes in fire-prone areas get the most out of pairing the two.

Know your tier before the next watch

Look up your address on the CPUC map, then decide what you’d want running if SDG&E called a shutoff tomorrow. If you’re in or near the HFTD, Stellar Solar can design solar and battery backup around your home’s real loads and your neighborhood’s shutoff history. Stellar Solar has been San Diego’s trusted solar installer since 1998, A+ rated with the BBB and a repeat winner of San Diego’s Best Solar in the Union-Tribune Readers Poll. Call 866.787.6527 for a free evaluation, or get your free quote here.

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Solar Plus Battery vs. a Generator: The Better Backup Plan for SDG&E Power Shutoffs

A generator and a home battery both keep the lights on when SDG&E cuts power for fire weather. They do it in very different ways, and only one of them does anything for you the rest of the year.

https://www.youtube.com/watch?v=TlgLXJu8g9o

Key takeaways

• A solar-charged battery switches on automatically during an outage. A portable generator has to be started, fueled and connected by someone at home.
• In a multi-day shutoff, fuel is a generator’s weak point. A battery refills from the panels every sunny day.
• The CPSC says never to run a portable generator in a home or garage, and to keep it at least 20 feet from the house.
• A battery also lowers bills the rest of the year by covering SDG&E’s 4 to 9 p.m. peak hours. A generator sits idle until the next outage.
• SDG&E’s 2026 Generator Assistance Program offers $300 toward a qualifying generator or $150 toward a portable power station for eligible customers in Tier 2 or Tier 3 fire areas.

Frequently asked questions

Is a solar battery or a generator better for SDG&E power shutoffs?

For automatic, whole-home or large-circuit backup that lasts through a multi-day shutoff without refueling, a solar-charged battery is the better fit. A portable generator or power station is the lowest upfront cost if you only need to run one or two appliances.

Can a Powerwall replace a generator?

In many homes, yes. Each Powerwall 3 stores 13.5 kWh, delivers up to 11.5 kW continuously and switches over automatically, and the panels recharge it during the day. Tesla says a Powerwall 3 system can provide whole-home backup to most homes, though large loads like central air and pool pumps drain it faster.

Does SDG&E offer a generator rebate?

Yes. The 2026 Generator Assistance Program offers $300 toward a qualifying fuel generator and $150 toward a portable power station ($500 and $200 total for customers enrolled in CARE or FERA) to customers in High Fire Threat District Tier 2 or Tier 3 areas who have experienced at least one PSPS. Fuel generators must be CARB-compliant and include a carbon monoxide sensor and automatic shut-off.

Where is it safe to run a portable generator?

Outdoors only. The U.S. Consumer Product Safety Commission says never to run one inside a home or garage, to keep it at least 20 feet from the house, and to point the exhaust away from windows and doors.

Will gas generators still be sold in California?

California’s Air Resources Board adopted rules under which most new portable generators made for sale in California must be zero-emission starting with model year 2028.

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If you live in inland San Diego County, the question usually comes up the first time a Public Safety Power Shutoff watch lands on your phone: should we get a generator, or should we get a battery? In Poway, Ramona and San Marcos it often sounds like “do I want a backup generator or a solar generator?” Both are real answers. A portable generator is the cheapest way to keep a refrigerator cold for a weekend. A solar-charged battery is the most hands-off way to keep a whole home running for days. Here is how they compare on the things that actually matter during a shutoff.

The two ways to keep power on

Generators burn fuel (gasoline, propane or natural gas) to make electricity. They come in two broad types:

• Portable generators sit outside and power appliances through extension cords or a manually switched transfer connection.
• Standby generators are permanently installed, wired to an automatic transfer switch, and usually run on natural gas or a propane tank.

A solar-charged battery stores electricity from your panels and the grid. When the grid goes down, a backup switch disconnects your home and the battery takes over automatically. With a Tesla Powerwall 3, each unit stores 13.5 kWh and delivers up to 11.5 kW continuously, and the panels recharge it every sunny day of the outage.

How each one starts

A battery switch-over is automatic. Nobody has to be home, and nobody has to pull a cord or run an extension line.

A portable generator starts when you start it. Someone has to be home, pull it out, fuel it, run the cords and decide which appliances get power. A standby generator starts on its own, but it still runs only as long as its fuel lasts.

Fuel during a multi-day shutoff

SDG&E says a shutoff can last from several hours to multiple days, because crews must inspect de-energized lines in daylight before restoring power. That makes fuel the weak point for a portable generator. You need enough stored gasoline to run through the event, a safe place to keep it, and a plan to refill if the shutoff drags on. Gas stations inside the shutoff area may be without power too.

A battery’s fuel is the sun. During a fall shutoff, the days are often clear and bright, so the panels can refill much of what the home used overnight.

Safety: carbon monoxide

This is the biggest practical difference. The U.S. Consumer Product Safety Commission says never to run a portable generator inside a home or garage, to keep it at least 20 feet from the house, and to point the exhaust away from windows and doors. Even so, the CPSC attributes about 100 deaths a year to carbon monoxide from portable generators. A home battery produces no exhaust and can be installed in a garage or on an exterior wall.

Air rules are changing

California’s Air Resources Board adopted rules requiring most new small off-road engines to be zero-emission. Under those rules, most new portable generators made for sale in California must be zero-emission starting with model year 2028. If you’re buying a gas generator now, it’s worth knowing the direction the state is headed.

What each does the other 360 days a year

A generator is insurance. It sits in the garage until the next outage.

A battery works every day. On SDG&E’s time-of-use plans, the most expensive hours run from 4 to 9 p.m. A battery charged by midday solar can power the house through those evening hours, which is where much of the value of a solar system comes from under California’s current solar billing rules. SDG&E explains its time-of-use windows on its residential pricing plans page.

So the honest comparison isn’t generator price versus battery price. It’s generator price versus battery price minus what the battery saves on your bill over its life.

SDG&E’s Generator Assistance Program

If you just want a small backup for a refrigerator, phones and a CPAP, a portable unit can make sense, and SDG&E helps pay for it in some areas. The 2026 Generator Assistance Program offers rebates to customers who live in High Fire Threat District Tier 2 or Tier 3 areas and have experienced at least one PSPS:

• $300 toward a qualifying fuel generator
• $150 toward a portable power station
• $500 and $200 total for customers enrolled in CARE or FERA

Fuel generators must be CARB-compliant and include a carbon monoxide sensor and automatic shut-off. Many homeowners pair a small portable power station for one or two critical devices with a home battery for everything else.

Which one fits your home

If you want…	Better fit
The lowest upfront cost for one or two appliances	Portable generator or power station
Automatic, whole-home or large-circuit backup	Solar plus battery
Backup that lasts through a multi-day shutoff without refueling	Solar plus battery
Lower SDG&E bills between outages	Solar plus battery
No fumes, noise or fuel storage	Solar plus battery

Build the backup plan once

The right time to decide is before the next watch notice, not during it. If you’re weighing a generator against a battery, Stellar Solar can show you what your essentials actually draw and what a solar-charged battery would save between outages. Stellar Solar has been San Diego’s trusted solar installer since 1998, A+ rated with the BBB and a repeat winner of San Diego’s Best Solar in the Union-Tribune Readers Poll. Call 866.787.6527 for a free evaluation, or get your free quote here.

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