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Office of Energy Efficiency


Energy Efficiency Trends in Canada, 1990 to 2005

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Chapter 1. Introduction

Canadians spent $152 billion on energy in 2005.

Energy accounts for a large segment of spending by households, businesses and industries alike. In 2005, Canadians spent about $152 billion on energy to heat and cool their homes and offices and to operate their appliances, cars and industrial processes. This amount is equivalent to about 14 percent of the country's gross domestic product (GDP).

This report provides an overview of Canada's secondary energy use and related GHG emissions. In addition to providing detailed information about energy intensity and energy efficiency levels in 2005, this report also analyses the energy intensity and efficiency trends between 1990 and 2005. Such monitoring aids the OEE in promoting energy efficiency in all aspects of Canadian life. It contributes toward the goal of improving our natural environment through knowledge and understanding.

Measurement of energy

To compare sources of energy, all energy consumption data presented in this report are expressed in joules. One joule is equivalent to the work required to produce one watt of power continuously for one second. One petajoule (PJ), which is a million billion (1015) joules, is equivalent to the energy required by 8900 households (excluding transportation requirements) over one year.

Two types of energy use

There are two general types of energy use: primary and secondary. Primary energy use (see Figure 1.1) encompasses the total requirements for all users of energy. This includes secondary energy use. Additionally, primary energy use refers to the energy required to transform one form of energy to another (e.g. coal to electricity).

Figure 1.1 Primary and secondary energy use by sector, 2005 (percent)

Figure 1.1 Primary and secondary energy use by sector, 2005 (percent).

It also includes the energy used to bring energy supplies to the consumer (e.g. pipeline). Further, it entails the energy used to feed industrial production processes (e.g. the natural gas used by the chemical industries). In 2005, the total amount of primary energy consumed was estimated at 12 369 PJ (see Appendix A, "Reconciliation of data" for more details).

Secondary energy use¹ (see Figure 1.1) is the energy used by final consumers in various sectors of the economy. This includes, for example, the energy used by vehicles in the transportation sector. Secondary energy use encompasses energy required to heat and cool homes or businesses in the residential and commercial/institutional sectors. Commercially, it comprises energy required to run machinery in the industrial and agricultural sectors. Secondary energy use accounted for 69 percent of the primary energy use in 2005, or 8475 PJ.

This report focuses on secondary energy use and assesses trends in this category. The energy used to generate electricity is also included, to allow the link of electricity emissions to the appropriate final user of electricity. This mapping of GHG emissions to appropriate electricity consumers is discussed in more detail in the section "GHG emissions."

All subsequent references in this report to "energy" should be interpreted as secondary energy.

GHG emissions

This report also analyses energy-related GHG emissions, including carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). CO2 represents more than 97 percent of Canada's energy-related GHG emissions.

Total Canadian GHG emissions are estimated to have been 747.5 megatonnes (Mt) in 2005; of this, 66 percent (or 495 Mt) resulted from secondary energy use (including electricity-related GHG emissions).²

Unlike other fuels used at the end-use level, electricity use does not produce any GHG emissions at the source of consumption. GHG emissions related to electricity are emitted at the point of generation. These are sometimes referred to as indirect emissions.

Therefore, it is a common practice in energy end-use analysis to allocate GHG emissions associated with electricity production to the sector that uses that electricity. This allocation is done by multiplying the amount of electricity used by a national average emission factor that reflects the average mix of fuels used to generate electricity in Canada.

Environment Canada's National Inventory Report, 1990-2004 – Greenhouse Gas Sources and Sinks in Canada has more information about total Canadian GHG emissions. This GHG inventory was prepared according to the specifications of the Intergovernmental Panel on Climate Change, accounting for all types of GHG emissions in Canada. However, NRCan's OEE developed a sectoral mapping that is more suited to energy end-use analysis.

All subsequent references in this report to GHG emissions are expressed in tonnes of carbon dioxide equivalent (CO2e). They include only emissions directly attributable to secondary energy use and indirect emissions attributable to electricity used as final demand, unless otherwise specified.

Energy intensity and energy efficiency

The term energy intensity is used frequently throughout this report. Energy intensity is the ratio of energy use per unit of activity. Because energy intensity is a simple calculation for which data are readily available, it is often used as a proxy for energy efficiency. However, this practice can be misleading: in addition to pure energy efficiency, energy intensity captures the impact of many factors that influence energy demand, such as weather or structural change.

Because of this inherent shortfall in energy intensity measure, the OEE tracks energy efficiency to gauge changes in energy demand due to changes in activity, economic structure, service level and weather. In summary, the energy efficiency measure factors out these items from the energy intensity calculation.

The methodology of this factorization – the Log-Mean Divisia Index I (LMDI I) methodology – is an internationally recognized factorization analysis technique. It decomposes changes in energy use into the various drivers in each sector so that energy efficiency can be assessed.

In this report

This report describes secondary energy use in Canada, overall, and also at a sectoral level. For each sector, the status in 2005 of energy use and GHG emissions is described, followed by the trends in energy use and GHG emissions from 1990 to 2005. Finally, the overall and sector analysis provides the results of the factorization analysis and a detailed discussion of the trends in energy efficiency and energy intensity over the sample period.

New factorization methodology

The analysis in this report is based on a factorization (decomposition) technique. In last year's publication, the OEE updated the factorization technique from a refined Laspeyres index methodology to a Log-Mean Divisia Index I (LMDI I) methodology. Although both methods are theoretically sound, this update offered similar results but eliminated the complication of allocating a residual term, which the former technique produced. Based on further examination of a consultancy report, the LMDI I method was further improved in this year's publication. The improvement was accomplished through the incorporation of a rolling base year and the redefinition of structure at various levels. This change ensures that lower-level decomposition results sum to those estimated at higher levels. It consolidates the various definitions of structure at different levels and places less weight on 1990 data and energy consumption characteristics. As a result, effects estimated are easier to explain, understand and use, which adds value to the energy efficiency trend analysis. For more information about this update and to see a comparison of the results presented in this report and the LMDI I methodology implemented last year, e-mail us.

¹ Secondary energy use covered in this report excludes pipeline energy consumption, natural gas (non-marketable gas, marketable gas and flared) and non-energy use (feedstock).

² These figures are OEE estimates; Environment Canada is responsible for Canada's official GHG inventory.

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