What changed in energy waste and construction?

Energy, waste and construction changes in NACE Rev. 2.1 are listed in the manual passages on Sections D, E and F. Section D for electricity, gas, steam and air conditioning supply saw a restructuring of group 35.1, with new classes for electricity production by source and for storage. Section F for construction saw the dropping of group 41.1, a restructuring of division 43, and a split of one installation class. Each change is a major change as defined in the manual, and each must be traced in the correspondence table for the classes concerned.

What changed in Section D for electricity and gas?

Group 35.1 for electric power generation, transmission and distribution was restructured. New classes were created: 35.11 for production of electricity from non renewable sources, 35.12 for production of electricity from renewable sources, and 35.16 for storage of electricity. A new class 35.24 for storage of gas as part of network supply services was also created. The manual gives those class numbers and headings in the Section D passage. The creation of separate classes for production by source, and for storage, gives the classification a finer breakdown for electricity and gas supply, where the earlier structure grouped production more broadly.

The heading for Section D stayed the same, and the section letter stayed the same, because the section is before the split point in the alphabet. The change is therefore entirely inside the section, at group and class level. A reader comparing electricity statistics over time must check the correspondence table for the classes in group 35.1, because a former class for electricity production may now be divided by source, and a former class for supply may now be separated from storage. The notes for the new classes state what each includes and excludes, and the notes must be read before a series is compared across the change.

Section	Change stated in the manual
D	Group 35.1 restructured, new classes 35.11, 35.12, 35.16, plus new class 35.24
E	Groups 38.2 and 38.3 restructured into new groups 38.2 and 38.3, new classes 38.21 to 38.23
F	Group 41.1 dropped, division 43 restructured, class 43.29 split

What changed in Section E for waste?

Groups 38.2 for waste treatment and disposal, and 38.3 for materials recovery, were restructured. New groups were created: 38.2 for waste recovery, and 38.3 for waste disposal without recovery. The group numbers are reused, with new headings, so the numbers alone do not show the change. The headings must be read in the version concerned. New classes were created inside the new groups: 38.21 for materials recovery, 38.22 for energy recovery, and 38.23 for other waste recovery. The manual gives those numbers and headings in the Section E passage.

The restructuring separates recovery from disposal without recovery at group level, and separates the kinds of recovery at class level. A reader who compares waste statistics over time must therefore check whether a former class for treatment or recovery maps to one new class, or to several, and whether the relationship is one to one, many to one, one to many, or many to many. The correspondence table gives the type for each class, and the notes give the scope. A comparison that uses only the group numbers, without the headings and notes for the version concerned, will mix the old and new group meanings, because the numbers were reused with new headings.

What changed in Section F for construction?

Group 41.1 for development of building projects was dropped, with its sole class 41.10 moved to group 68.1 for real estate activities with own property and development of building projects, in Section M. The manual states the move in the Section F passage, and confirms it in the Section M passage, where the new class 68.12 for development of building projects is listed. Division 43 for specialised construction activities was restructured, with new groups 43.4 for specialised construction in construction of buildings, 43.5 for specialised construction in civil engineering, and 43.6 for intermediation for specialised construction services. Class 43.29 for other construction installation was split into class 43.23 for installation of insulation, and class 43.24 for other construction installation.

The construction changes therefore include a move across sections, a restructuring inside a division, and a split inside a group. Each kind of change must be traced differently. The move across sections requires a check of the correspondence table for class 41.10, and a check of the note for the new class 68.12. The restructuring of division 43 requires a check of the new groups and the classes inside them. The split of class 43.29 requires a check of the notes for both new classes, to see which part of the old scope each covers. A single summary of construction change cannot replace those three checks.

What does the energy, waste and construction changelog not show?

The changelog passages for Sections D, E and F list major changes only, as defined in the manual. Minor changes, including heading changes at group and class level, renumbering, recoding and partial transfers of content, are not listed there. A class in those sections that is not listed may still have changed in a minor way, and its note must be compared across versions before a time series is read. The passages also do not state the effect on statistics. Backcasting and double reporting, mentioned on the Eurostat overview page, are the production tools for managing breaks, and the correspondence table is the starting point for those tools.

Read the manual passages for Sections D, E and F for the major changes, check the correspondence table for the class, and confirm any entry with the national statistical institute or the business register that holds the record.