Energy efficiency

Energy efficiency is a key concept in the fight against climate change and the reduction of our carbon footprint. It refers to using energy more intelligently and effectively—achieving the same services or outputs with less energy consumption. This leads to a reduction in greenhouse gas (GHG) emissions and lowers overall environmental impact.

Why is energy efficiency important for the carbon footprint?

Energy generation is one of the main sources of GHG emissions globally. By improving energy efficiency, we reduce energy demand and thus the emissions linked to its production. As a result, energy efficiency becomes a powerful tool to combat climate change and support the transition to a low-carbon future.

Energy efficiency measures

Energy efficiency measures can be implemented across various sectors, including households, industry, transport, and buildings.

At home

• Use energy-efficient appliances (rated A+++ or higher)
• Replace traditional bulbs with LED lighting
• Improve home insulation
• Maximize natural light and use efficient heating/cooling systems

In industry

• Optimize production processes to reduce energy use
• Implement energy management systems (e.g., ISO 50001)
• Upgrade to more efficient machinery and equipment
• Incorporate renewable energy sources

In transport

• Promote electric or hybrid vehicles
• Encourage public transport, biking, and walking
• Improve logistics and freight transport efficiency

In buildings

• Design energy-efficient buildings (e.g., with energy certifications)
• Use sustainable construction materials
• Install building energy management systems

How is energy efficiency calculated?

Energy efficiency can be measured using different indicators depending on the context, but a common formula is:

Energy Efficiency (%) = (Useful Output Energy / Input Energy) × 100

For example, if a machine uses 100 units of energy to produce 80 units of useful output, its efficiency is:

(80 / 100) × 100 = 80% efficiency

In carbon footprint terms, improving efficiency means reducing emissions per unit of output—an essential step toward decarbonization.

Benefits of energy efficiency

Beyond reducing GHG emissions, energy efficiency offers multiple advantages:

• Cost savings: Lower energy use means lower energy bills
• Improved competitiveness: Energy-efficient businesses reduce operational costs
• Job creation: Drives employment in renewable energy, green construction, and energy consulting
• Public health improvement: Reduced air pollution benefits overall health
• Energy security: Lower reliance on imported fossil fuels enhances national energy independence

Legal and regulatory framework

Energy efficiency is a global priority reflected in numerous policies and agreements. At the European level, the Directive 2012/27/EU establishes binding targets for reducing energy consumption across member states.

In Spain, Royal Decree-Law 3/2023 (May 16) introduces urgent measures to improve energy efficiency, particularly in response to the energy crisis linked to the conflict in Ukraine.

By implementing energy efficiency strategies, individuals, businesses, and governments can simultaneously reduce emissions, save money, and foster innovation in the transition to a sustainable future. With Manglai, companies can measure and track the impact of their energy efficiency improvements as part of their broader carbon footprint strategy.