Brownout VS Blackout: Definition and Preparation Tips

brownout in public space
In our modern world, we heavily rely on a consistent and uninterrupted supply of electricity. If there is an electricity issue we can lose so much, especially if we work from home. These disruptions are known as brownouts.

What Is the Difference Between a Blackout and a Brownout?

A blackout and a brownout are both electrical disruptions, but they differ in terms of severity and duration:


A blackout refers to a complete loss of electrical power in a specific area. During a blackout, there is a total absence of electricity, resulting in a complete shutdown of all electrical devices and systems. Blackouts can be caused by severe weather conditions, equipment failures, grid overloads, or intentional power cuts.


A brownout, on the other hand, involves a temporary decrease in voltage levels that fall below the standard level for a specific region. During a brownout, the power supply is not entirely cut off, but there is a reduction in electrical power. Brownouts can also be caused by factors such as high demand or equipment failures.

What Are Brownouts?

A brownout refers to a temporary voltage drop in the electrical power supply, resulting in a decrease in voltage levels that fall below the standard level for a specific region. Unlike a complete power outage, where the power supply is entirely cut off, a brownout leads to reduced electrical power, often resulting in dimming lights, slower appliances, and overall reduced functionality.

What Are the Causes of Brownouts?

Brownouts can be caused by various factors, both natural and human-made. Here are a few common causes:

High Demand

During periods of peak energy consumption, such as humid summers or extreme cold, the power grid can experience strain due to the increased load on the system. If the demand surpasses the available supply, brownouts can occur.

Insufficient Infrastructure

In some regions, outdated or inadequate electrical infrastructure may struggle to handle the growing energy needs of a population. Ageing power grids or transmission lines can be vulnerable to voltage fluctuations, increasing the likelihood of brownouts.

Equipment Failures

Faulty equipment, such as transformers or circuit breakers, can cause irregularities in the power supply. When critical components malfunction, they can lead to voltage drops and trigger brownouts.

Severe Weather Conditions

Storms, hurricanes, or extreme weather events can damage power lines and disrupt the electricity supply. Fallen trees, lightning strikes, or flooding can affect the infrastructure, causing brownouts.

What Happens During a Brownout?

During a brownout, there is a temporary decrease in voltage levels in the electrical power supply, resulting in reduced electrical power throughout the affected area. Here's what can happen during a brownout:

Dimming Lights

One of the most noticeable effects of a brownout is the dimming of lights. The reduced voltage causes the lights to appear dimmer than usual, indicating a decrease in available electrical power.

Slower Appliance Performance

Electrical appliances and devices may experience slower performance during a brownout. Motors in appliances like refrigerators, air conditioners, and fans may run at a lower speed, resulting in reduced cooling or ventilation.

Electronic Device Issues

Sensitive electronic devices, such as computers, smartphones, and televisions, can be affected by brownouts. They may experience slower processing speeds, system freezes, or even shut down unexpectedly due to insufficient power supply.

Flickering or Unstable Electronics

Brownouts can cause flickering or unstable operation of electronic devices and appliances. Lights may flicker or exhibit fluctuations in brightness, indicating voltage instability.

Potential Equipment Damage

Brownouts can pose a risk to electrical equipment. The fluctuating voltage levels can strain devices, potentially leading to overheating, premature wear and tear, or even damage to sensitive components.

person repairs electric lines after a brownout

What to Do in a Brownout?

Experiencing a brownout can be inconvenient and it can cause not just damage to electric devices but also a lot of stress. Here is what you should do during a brownout:

Assess the Situation

Determine if it is indeed a brownout and not a localised issue in your home or building. Check if your neighbours or nearby areas are also affected. This will help you understand the scope of the brownout and whether it is necessary to take further action.

Preserve Electronics

Safely shut down or unplug sensitive electronic devices like computers, televisions, and gaming consoles. This can protect them from potential damage caused by voltage fluctuations when the power is restored.

Prioritise Power Usage

Identify essential devices or appliances that require immediate power. Allocate the available power to critical items such as refrigerators, or communication devices.

Minimise Energy Usage

Reduce your overall energy consumption during a brownout to lessen the strain on the power grid. Turn off unnecessary lights, appliances, and electronics to conserve power and help stabilise the electrical system.

Use Surge Protectors or UPS Systems

Connect important electronic devices to surge protectors or uninterruptible power supply systems. These devices can regulate the voltage and provide temporary backup power, protecting your equipment from voltage fluctuations and power surges.

Stay Informed

Keep yourself updated on the status of the brownout. Listen to local news reports or check utility company announcements for information on the cause, estimated duration, and progress of resolving the brownout.

Prepare Alternative Power Sources

Consider having backup power sources available for emergencies. Depending on your needs and resources, this can range from small portable generators to solar power systems or battery backup solutions. These alternative power sources can provide temporary electricity during a brownout and help you maintain essential services.

bluetti backup power source

Follow Safety Guidelines

During a brownout, it's essential to prioritise safety. Avoid using candles or open flames as alternative lighting sources, as they can pose fire hazards. Use battery-operated flashlights or LED lanterns instead. Additionally, be cautious when using generators or alternative power sources, following all safety instructions and guidelines to prevent carbon monoxide poisoning or electrical accidents.

Report the Brownout

If the brownout persists for an extended period or affects a large area, report it to your local utility company. They can investigate and address the issue promptly.

candle lit during a brownout poses fire risk

How to Prepare for a Brownout?

Preparing for a brownout can help you minimise its impact and ensure you have the necessary resources to manage the situation. If brownouts happen often in your area good preparation is necessary so that your electronic devices do not get damaged. Here are some steps to help you prepare for a brownout:

Create an Emergency Kit

Prepare an emergency kit that includes essential items such as flashlights, extra batteries, a battery-powered radio, and a first aid kit. Include necessary medications, non-perishable food, and bottled water to sustain you and your family during a brownout that may last for an extended period.

Invest in Surge Protectors and UPS Systems

Purchase surge protectors or uninterruptible power supply systems to safeguard sensitive electronic devices. These devices regulate voltage levels and provide temporary backup power, helping protect your electronics from damage during a brownout.

Backup Power Sources

Consider investing in alternative power sources, such as generators, solar panels, or battery backup systems. These can provide electricity during a brownout, keeping essential devices running until regular power is restored. Ensure you have fuel or charged batteries available for your backup power sources.

Maintain Communication Devices

Ensure you have reliable communication devices in case of a brownout. Keep cell phones, portable chargers, or battery-operated radios fully charged and easily accessible. Consider having backup means of communication, such as a landline phone or a two-way radio, which may not rely on electrical power.

Identify Essential Devices

Identify critical devices or appliances that you rely on for essential services or health needs. These may include refrigerators, heating or cooling systems, or cell phones. Plan ahead to manage the power supply to these devices during a brownout.

Learn Manual Operations

Familiarise yourself with manual operations of essential devices, such as knowing how to manually open electric garage doors or gates, or how to use a manual can opener. This knowledge can be valuable during a brownout when electrical devices may not function.

Energy Conservation Practices

Practice energy-efficient habits in your daily life. This can help reduce your overall energy consumption and alleviate strain on the power grid during periods of high demand, potentially minimising the occurrence of brownouts.

Stay Informed

Stay updated on your local utility company's notifications, news reports, or social media channels regarding potential brownouts. Understanding scheduled maintenance or expected high-demand periods can help you anticipate and prepare for potential brownout situations.

Community Support

Consider establishing connections with your neighbours and forming a community support system. This can be beneficial during a brownout, as you can share resources, and information, and support each other during power disruptions.

Know Emergency Procedures

Familiarise yourself with emergency procedures provided by your local utility company or relevant authorities. Understand how to safely report a brownout, how to turn off electrical power to your home if necessary, and what steps to take during extended power outages.

By taking these preparedness measures, you can ensure you are ready to handle a brownout effectively and minimise its impact on your daily life. Remember to review and update your preparations periodically to account for any changes in circumstances or equipment.

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