Google 採購 Stegra 綠鋼環境屬性憑證，資料中心減碳須防實體鋼材與證書重複主張

ESG Today 報導，Google 與瑞典綠鋼開發商 Stegra 簽署環境屬性憑證採購協議，目標是處理資料中心建設使用鋼材的隱含排放。這類 book-and-claim 安排可讓憑證買方與實體鋼材交付地點分離。

ESG Today reports that Google and Swedish green-steel developer Stegra signed an environmental attribute certificate purchase agreement addressing embodied emissions from steel used in data-center construction. This book-and-claim structure can separate the certificate buyer from the physical steel delivery location.

Stegra 正在瑞典建設以再生電力與綠氫為核心的鋼鐵設施，過去亦籌集大額專案融資。Google 在芬蘭與其他市場持續擴充資料中心，使鋼材、水泥與電力的生命週期排放逐漸成為採購議題。

Stegra is developing a Swedish steel facility centred on renewable electricity and green hydrogen and has raised large project-finance packages. Google's continuing data-center expansion in Finland and elsewhere makes life-cycle emissions from steel, cement and power increasingly material to procurement.

環境屬性憑證可以加速早期需求，但也增加重複主張風險。若同一低碳生產屬性同時出現在鋼材買方的產品碳足跡、Google 的 Scope 3 帳本與另一張憑證中，市場就無法判斷真正的減排歸屬。

Environmental attribute certificates can accelerate early demand but also create double-claim risk. If the same low-carbon production attribute appears in the steel buyer's product footprint, Google's Scope 3 ledger and another certificate, the market cannot determine who owns the emissions benefit.

合約必須定義憑證代表的噸數、基準排放、分配邊界、有效期間與退休規則。Stegra 應把生產批次與能源量測連到唯一序號；Google 則須將序號、付款、建設物料表與 Scope 3 調整建立逐筆對照。

The contract needs to define represented tonnage, baseline emissions, allocation boundary, validity period and retirement rules. Stegra should link production batches and energy metering to unique serials, while Google should reconcile serials, payments, construction bills of materials and Scope 3 adjustments at record level.

四筆固定來源證據涵蓋本次憑證交易、Stegra 的設施融資與工程進度，以及 Google 資料中心投資和資料中心排放成長脈絡。它們支持交易與產業背景，但最終減排仍須由生產量測、第三方查證與退休紀錄證明。

Four fixed-source reports cover the certificate transaction, Stegra's facility financing and development, Google's data-center investment and the sector's emissions trajectory. They support the deal and industry context, but final reductions still require production measurements, third-party assurance and retirement records.

綠鋼市場若採用 book-and-claim，鋼廠、建設承包商、雲端業者、查驗機構與財務部門必須共用可追溯但責任分離的帳本。採購金額不能直接等同減排成果，且實體鋼材與環境屬性應避免被不同主體重複揭露。

If green steel uses book-and-claim structures, mills, construction contractors, cloud operators, assurance providers and finance teams need traceable but role-separated ledgers. Purchase value cannot equal emissions performance, and physical steel and environmental attributes must not be claimed twice by different parties.

SNN editorial interpretation：外部市場變化是 Google 以環境屬性憑證支持 Stegra 綠鋼產能，讓資料中心的鋼材減碳可以透過 book-and-claim 與實體交貨分離。這不表示 Stegra 鋼材已交付台灣，也不代表台灣揭露準則已認可相同主張。條件式傳導會出現在台灣資料中心建設採購，以及台灣鋼材與伺服器供應鏈的 Scope 3 帳本。第一，資料中心業主與總承包商應在設計定案和每季採購檢討時，由專案採購主管核對環境屬性憑證合約、鋼材噸數分配清冊、建設物料表與產品環境宣告，只有主張邊界與實體用量一致才能計入專案減碳。第二，鋼鐵與建材供應商須在每批出貨前，由品質主管把生產批次紀錄、再生電力與氫氣量測、憑證序號及發票與交貨紀錄建立一對一連結，若序號已分配給另一買方就不得再次主張。第三，採購、財務與永續團隊應在付款、憑證退休及年度 Scope 3 揭露前，共同核對退休紀錄、Scope 3 調整帳、合約付款條件與第三方查證聲明，任何方法版本或基準排放改變都要重算成果。揭露前證據基礎設施在此是分開管理實體鋼材、環境屬性、付款與排放帳，避免台灣供應鏈在多個客戶之間重複分配同一減排。

SNN editorial interpretation: The external market change is Google's use of environmental attribute certificates to support Stegra green-steel capacity, allowing data-center steel decarbonisation to use a book-and-claim route separate from physical delivery. This does not mean Stegra steel has been delivered to Taiwan, and it does not mean Taiwan disclosure rules recognise the same claim. The conditional transmission routes are Taiwan data-center construction procurement and Scope 3 ledgers in Taiwan steel and server supply chains. First, at design freeze and each quarterly procurement review, data-center owners and general contractors should have the company procurement team reconcile the environmental attribute certificate contract, steel-tonnage allocation ledger, construction bill of materials and environmental product declaration; a project claim should proceed only when the claim boundary matches physical use. Second, before every shipment, steel and construction-material suppliers must have the quality owner link the production batch record, renewable-power and hydrogen metering, certificate serial number and invoice and delivery record one to one; a serial already allocated to another buyer must not be claimed again. Third, before payment, certificate retirement and annual Scope 3 disclosure, procurement, finance and sustainability teams should jointly reconcile the retirement record, Scope 3 adjustment ledger, contractual payment trigger and third-party verification statement; any methodology or baseline change should trigger recalculation. Here, Pre-Disclosure Evidence Infrastructure keeps physical steel, environmental attributes, payment and emissions accounting separate. It prevents Taiwan supply-chain participants from allocating one reduction to multiple customers.

後續應追蹤 Stegra 投產、憑證方法公開程度、第三方查驗、序號登錄與退休、Google 的 Scope 3 揭露，以及實體鋼材客戶如何處理已出售的環境屬性。

Future checks should cover Stegra commissioning, publication of the certificate methodology, third-party assurance, serial registration and retirement, Google's Scope 3 disclosure and treatment by physical steel buyers after attributes are sold.