Practical ways to reduce energy consumption in an office environment

Most office buildings operate on a schedule that does not align with the actual needs of the people inside them. Lights often stay on in empty meeting rooms, heating or cooling runs at full strength in unoccupied zones, and computers remain in high-power modes throughout the night. While large-scale building management systems are designed to handle these issues, they are rarely perfect. Individual habits and small adjustments to how we interact with our immediate workspace can make a measurable difference to the total energy load of a commercial building.

Manage your immediate digital footprint

The devices sitting on your desk are constant consumers of electricity. While a single laptop uses relatively little power, the cumulative effect of dozens or hundreds of devices in a single office is substantial. The most effective way to manage this is to address what happens when you are not at your desk.

Many people leave their computers running in a high-power state when they go for lunch or head home for the day. Setting your device to enter a low-power sleep mode is a good start, but shutting down completely at the end of the working day is better. When a computer is shut down, it eliminates the "phantom load," which is the electricity consumed by power supplies even when the device is not actively being used.

Peripherals also contribute to this load. Monitors, external hard drives, and desk lamps should be turned off when not in use. If your desk is set up with multiple screens, remember that each additional monitor increases the energy draw. If you do not need a second screen for a specific task, turning it off can save a noticeable amount of power over a week.

Control the thermal environment

Heating and cooling are typically the largest energy consumers in any office building. Because large buildings use central systems, it can feel as though you have no control over the temperature. However, how you manage your personal space can influence how much the central system has to work.

In the winter, instead of asking for the heating to be turned up, try to use layers of clothing. A jumper or a heavier pair of trousers can make a significant difference to your personal comfort without requiring a change in the building's thermostat. Similarly, in warmer months, using a small desk fan can help circulate air around you, making you feel cooler without needing to lower the temperature of the entire floor.

Be mindful of how sunlight affects your workspace. In the summer, closing blinds or curtains during the hottest part of the day can prevent the "greenhouse effect" from heating up your desk area. This reduces the need for air conditioning to combat the heat. In the winter, opening blinds to let in direct sunlight can provide free warmth, which you can then retain by closing them once the sun goes down.

Optimise lighting and shared spaces

Lighting is another area where collective action works well. Many modern offices use motion sensors to turn lights on and off, but these sensors are often poorly placed or set to incorrect timings. If you notice that lights are staying on in communal areas like kitchens, corridors, or bathrooms when no one is present, it is worth reporting this to your facilities management team.

In your own workspace, use natural light whenever possible. If your desk is near a window, try to position your monitor so that you do not have to rely on overhead fluorescent lights during the day. If your office uses task lighting, such as a small desk lamp, use that instead of the bright, general ceiling lights. Task lighting allows you to illuminate only the area you are working on, which is far more efficient.

Shared spaces like meeting rooms are particularly prone to waste. It is easy to walk out of a room and leave the lights and the projector running. Making it a habit to check that everything is switched off when a meeting concludes is a simple way to prevent unnecessary energy use.

Communicate with facilities management

Individual actions are important, but the most significant energy savings often come from systemic changes. If you notice that the heating is running while the windows are open, or that the air conditioning is blasting in an empty room, do not assume someone else will fix it.

Most large organisations have a process for reporting maintenance issues or facility concerns. Providing specific feedback can help the building managers fine-tune the automated systems. For example, if the temperature in a certain part of the building is consistently uncomfortable, reporting this might lead to a recalibration of the sensors.

You can also suggest more sustainable practices to your workplace's green committee or health and safety officer. This might include requesting that all communal printers be set to "eco-mode" by default, or asking for a policy that encourages turning off equipment at the end of the week. Small, policy-level changes often have a much larger impact than any single person's habits alone.

Things to try this week

• Shut down your computer and all peripherals completely every evening instead of leaving them in sleep mode.
• Use layers of clothing to manage your personal temperature rather than requesting changes to the building's heating or cooling.
• Close window blinds during the hottest part of a summer day to keep your workspace cool naturally.
• Check that lights and equipment in meeting rooms are turned off immediately after use.