IRES Chapter VIII — Energy Balances

Scope note: this digest covers the full chapter (Sections A–F, paras 8.1–8.61, PDF pp. 114–127) — the concept, purpose and principles of energy balances, the balance’s structure and row/column logic (including statistical difference), the detailed and aggregated balance templates, data reconciliation and estimation of missing data, and commodity balances.

Chapter VIII (PDF pp. 114–127) describes the energy balance: an accounting framework for compiling and reconciling data on all energy products entering, exiting and used within a country’s national territory, building on the flow and industry/consumer concepts of Chapter V [IRES, Ch. VIII, para. 8.1, PDF p. 114, 2018].

A. Introduction (paras 8.1–8.5)

Defines the energy balance as an accounting framework grounded in the first law of thermodynamics, expressing all energy forms in a common accounting unit [IRES, Ch. VIII, para. 8.1, PDF p. 114, 2018]. Balances can also be compiled per product (commodity balances — Section F, Pass 3) [IRES, Ch. VIII, para. 8.2, PDF p. 114, 2018]. Sets out the balance’s nine purposes, from enhancing statistical relevance and informing energy policy through to supporting CO2-emissions estimation, transformation-efficiency calculation and modelling/forecasting [IRES, Ch. VIII, para. 8.3, PDF p. 114, 2018], and distinguishes detailed (table 8.1) from aggregated (table 8.2) balance formats [IRES, Ch. VIII, para. 8.5, PDF p. 115, 2018]. Full detail is on Energy Balance.

B. Scope and general principles of energy balance compilation (paras 8.6–8.9)

Defines the balance’s territory, product and flow boundaries [IRES, Ch. VIII, para. 8.6, PDF p. 115, 2018] and what falls outside the balance’s scope (passive energy, resources/reserves, unrecorded extraction losses, non-energy peat/waste/biomass) [IRES, Ch. VIII, para. 8.8, PDF p. 115, 2018]. Sets out eleven general principles on balance coverage and structure (para. 8.9(a)–(k)), including the reference-period, matrix, column/row, statistical-difference-row, single-energy-unit and net-vs-gross calorific value principles, and — most substantively — the physical energy content method for primary electricity (vs. the partial substitution method), with default heat-input efficiencies of 33 per cent for nuclear/concentrating solar and 10 per cent for geothermal absent country-specific data [IRES, Ch. VIII, para. 8.9(j), PDF pp. 116–117, 2018]. Full detail is on Energy Balance.

C. Structure of energy balance: an overview (paras 8.10–8.46)

Describes the balance as a products-by-flows matrix, recommending SIEC-based, mutually exclusive product-group columns [IRES, Ch. VIII, para. 8.12, PDF p. 117, 2018] and three row blocks — top (supply), middle (transformation/transfers/EIOU/losses) and bottom (final consumption) — with a statistical-difference row placed between the top and middle blocks [IRES, Ch. VIII, para. 8.14, PDF pp. 117–118, 2018].

• 1. Top block — energy supply (paras 8.16–8.24): production, imports, exports and international bunkers, combined with stock changes into the total energy supply (TES) formula; documents the balance’s stock-change sign convention (a stock build shown as negative) [IRES, Ch. VIII, paras 8.17–8.18, PDF p. 118, 2018].
• 2. Middle block — transfers, transformation, own use and losses (paras 8.25–8.32): the transformation sign convention — inputs negative, outputs positive, with the row total therefore always negative [IRES, Ch. VIII, para. 8.30, PDF p. 119, 2018] — and energy industries own use and losses.
• 3. Bottom block — final consumption (paras 8.33–8.43): final energy consumption grouped into manufacturing/construction/non-fuel mining industries, transport, and other (households, commerce, agriculture, fishing), plus non-energy use as a separate row [IRES, Ch. VIII, para. 8.35, PDF p. 120, 2018]. Figure 8.1 maps this structure onto Chapter V’s cross-classification of uses and users (Figure 5.2) [IRES, Ch. VIII, para. 8.44, Figure 8.1, PDF pp. 121–122, 2018].
• 4. Statistical difference (paras 8.45–8.46): the numerical difference between total supply and total use of an energy product, and its role as a data-quality diagnostic, cross-referenced against commodity-balance statistical differences [IRES, Ch. VIII, para. 8.45, PDF p. 122, 2018]. Full detail is on Statistical Difference.

Full detail for the whole section is on Energy Balance.

D. Templates of detailed and aggregated energy balances (paras 8.47–8.49)

It is recommended that countries follow, as much as possible, the template of a detailed energy balance (table 8.1) [IRES, Ch. VIII, para. 8.47, PDF p. 123, 2018] — recommendations tracker row VIII/8.5. Where an aggregated format better suits national purposes, it is recommended that countries use the aggregated energy balance template (table 8.2) when only main aggregates are shown, to preserve international comparability and support monitoring of international agreements [IRES, Ch. VIII, para. 8.48, PDF p. 124, 2018] — recommendations tracker row VIII/8.48. Both templates use the same item-code/flow-label row structure derived from the balance’s row-block logic (Section C above), with generic placeholder product columns (E1, E2, E3, …, Total, of which: Renewables) to be populated with country-chosen, mutually exclusive SIEC-based product groups.

Additional information — e.g., flaring, venting and re-injection during primary production (data item 3.3, “extraction losses”) or during transformation (folded into “losses” but not separately identified) — can be presented via supplementary tables or memorandum items alongside the balance, useful for greenhouse-gas-emissions estimation and depletion assessment [IRES, Ch. VIII, para. 8.49, PDF p. 125, 2018].

Full detail, including the reproduced tables 8.1 and 8.2, is on Energy Balance.

E. Data reconciliation and estimation of missing data (paras 8.50–8.54)

Compiling an energy balance draws on data from various sources, including compilers working outside energy statistics; this makes the assessment of data accuracy, reconciliation, and estimation of missing data significant parts of balance compilation, with detailed good practice deferred to the forthcoming ESCM [IRES, Ch. VIII, para. 8.50, PDF p. 125, 2018]. It is recommended that accuracy requirements applicable to basic balance data be clearly described in a country’s energy statistics metadata [IRES, Ch. VIII, para. 8.51, PDF p. 125, 2018] — recommendations tracker row VIII/8.51. It is recommended that countries estimate missing data following general imputation methods established in other statistical domains (e.g. IRIS 2008) and forthcoming ESCM good practice [IRES, Ch. VIII, para. 8.52, footnote 67, PDF p. 125, 2018] — recommendations tracker row VIII/8.52. It is recommended that countries provide a reconciliation summary in the balance metadata, for transparency and proper interpretation [IRES, Ch. VIII, para. 8.53, PDF p. 125, 2018] — recommendations tracker row VIII/8.53. A worked example covers trade-data reconciliation: because official merchandise trade statistics do not always meet balance compilers’ needs for imports/exports and international bunkers, enterprise surveys may be needed to complement them, with differences explained in metadata; a national HS–SIEC correspondence table should be developed to present external trade flows in the balance’s energy categories [IRES, Ch. VIII, para. 8.54, PDF pp. 125–126, 2018] — recommendations tracker row VIII/8.54. Full detail is on Energy Balance.

F. Commodity balances (paras 8.55–8.61)

A commodity balance shows the sources of supply and uses of a single energy product for the national territory, recommended to follow the energy balance’s format and concepts consistently [IRES, Ch. VIII, para. 8.55, PDF p. 126, 2018] — recommendations tracker row VIII/8.55. Its unit of measurement is usually the product’s original/natural unit, though a non-original energy unit may also be used [IRES, Ch. VIII, para. 8.56, PDF p. 126, 2018]. It follows a common flow list similar to the energy balance’s rows, most often presented in a single column combining sources of supply and uses [IRES, Ch. VIII, paras 8.57–8.58, PDF pp. 126–127, 2018]. It is recommended that commodity balances be constructed for every energy commodity in national use, however minor [IRES, Ch. VIII, para. 8.59, PDF p. 127, 2018] — recommendations tracker row VIII/8.59. Commodity balances differ structurally from energy balances: secondary output is treated as “production” rather than “transformation output,” transformation input carries no negative sign, and blended-fuel content (e.g. biofuel blended into motor gasoline) is retained rather than split into fossil/non-fossil components [IRES, Ch. VIII, paras 8.60–8.61, PDF p. 127, 2018]. Full detail is on Commodity Balance.

Page map

Section	Page
A–C (concept, purpose, principles, structure, TES, sign conventions, Figure 8.1)	Energy Balance
C.4 — statistical difference	Statistical Difference
D — tables 8.1/8.2 templates	Energy Balance
E — data reconciliation and estimation of missing data	Energy Balance
F — commodity balances	Commodity Balance

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