Waste-transfer records from 14 high-voltage electricity-grid infrastructure projects in Portugal (transmission lines and substations)

Supplementary material for the article "Estimating waste and characterising removal timing in electricity-grid projects: evidence from mandatory traceability records". The underlying data are mandatory electronic waste-transfer records from 14 high-voltage electricity-grid infrastructure projects in Portugal (6 transmission lines, TL01 to TL06, and 8 substations, SS01 to SS08), comprising 258 records and 431.863 t of waste documented as removed from site. Project identities are anonymised. Table S1 lists the normalised European List of Waste (LoW) codes with hazard status, functional group and transferred mass by asset class. Table S2 breaks down transferred mass by LoW code and recorded initial management operation (R and D codes and preliminary storage). Figures S1 to S14 show the empirical cumulative transfer profile of each project over its relative transfer-record window, with t25, t50 and t75 marked. Record dates identify documented removal from site, not the timing of waste generation, and operation codes refer to the first reported operation; final treatment outcomes were not verified. Project SS02 was incomplete at the time of data extraction and was excluded from completed-project inference in the article.