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Energy Efficiency
Energy Efficiency Formula

9 Examples of Energy Efficiency

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Energy efficiency is the process of reducing the energy consumption of infrastructure, facilities, buildings, machines, devices, products, services, business processes, activities and transport. Efficiency is the opposite of waste. Energy efficiency can reduce cost, improve competitiveness, reduce environmental impact and improve quality of life. The following are common examples of energy efficiency.


Things take energy to make. As such, reuse conserves energy. For example, renovating an old building to give it new life may use far less energy than tearing it down and completely rebuilding it.

Passive Design

Designs that don't require power such as windows versus electric lights. Passive design is commonly used to light, heat and cool buildings.

Resource Utilization

Using resources that are freely available such as solar panels that capture the energy hitting a building as sunlight.

Efficient Design

Things engineered to use less energy. It is common for existing designs to only use a small fraction of the energy they consume for useful purposes. As such, design improvements can be significant. For example, an incandescent light bulb converts less than 5% of energy to visible light. A white LED light bulb with phosphorescence color mixing can exceed 20% efficiency.


Changes in lifestyle such as living close to the things you need has a significant impact on your energy consumption. In Japan, a campaign known as Cool Biz encourages office workers to dress informally in summer and companies to set air conditions to 28 °C, or 82 °F.

Power Down

Turning things off when you're not using them. For example, reducing excessive outdoor lighting that may represent light pollution.


Keeping things in good repair can reduce energy consumption. Repairing things over replacing them also conserves energy.

Waste Reduction

Reducing leaks and other wastes of energy. For example, renovation of an old building to improve insulation.


Achieving a high utilization rate for resources. For example, a train that carries thousands of passengers versus thousands of cars with one passenger.
Overview: Energy Efficiency
The process of reducing energy consumption.
Related Concepts

Energy Efficiency

This is the complete list of articles we have written about energy efficiency.
Efficiency Formula
Embodied Energy
Jevon's Paradox
Machine Efficiency
Passive Design
Sustainable Lighting
More ...
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Embodied Energy

An overview of embodied energy.

Resource Efficiency

The definition of resource efficiency with examples.

Architectural Materials

An overview of architectural materials with examples.


A list of efficiency measurements.

Agency Cost

The definition of agency cost with examples.

Efficiency Goals

An overview of efficiency goals with measurable examples.

Efficiency Types

The common types of efficiency with examples.


The definition of overpackaging with examples.

Scarcity Examples

An overview of scarcity with examples.

Overhead Cost Examples

The definition of overhead cost with examples.

More With Less

An overview of more with less with examples.

Productivity Examples

A list of productivity examples.

Is Complexity Good

An overview of complexity and its pros and cons.

Time Efficiency

An overview of time efficiency with examples.
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