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Efficiency Improvements

A Home Energy Professionals (HEP) Certifications Energy Auditor with Arapahoe County's Weatherization Division, performs a Blower Door Test. Energy audits give homeowners an idea of their home’s energy performance, and this knowledge can be used to reduce a home’s thermal leakage. Source: National Renewable Energy Laboratory.

Enhancing the energy efficiency of processes across sectors will be critical for reducing greenhouse gas emissions from our energy system. Efficiency improvements streamline and reduce actual energy consumption, and facilitates meeting energy requirements through renewable sources. This section explores key efficiency opportunities and anticipated benefits that could be achieved through enacting them across three sectors – buildings, industry, and transportation.

Avoided expenditure on energy due to efficiency improvements since 2000, by sector

In IEA member countries, technical efficiency gains since 2000 reduced expenditure on energy in 2018 by just over $600 billion USD, with the savings from gains since 2015 avoiding over $100 billion USD in 2018. Economic benefits accrued in all sectors, but have grown more recently in the transport sector due to oil price rises. Source: IEA (2019) Electrification Futures Study.

Energy efficiency investment by region, 2014-18 (left) and by sector in 2018 (right)

The left graph above shows how different world regions invest in energy efficiency, and how these investments have been changing during the past years. Worldwide, change in total investments in Energy Efficiency have increased positively. The right graph above shows how the building sector receives the most energy efficiency investments, and about half of those investments go towards building envelopes. In 2018, the Industry sector received almost the same investments as HVAC and Controls in Buildings did. Source: IEA (2019) Electrification Futures Study.