How to use Act IDs
Act IDs are designed to be simple to use. Reference them wherever you currently describe a financed activity — alongside your own language and descriptions.
The basic principle
You don't replace your existing language with an Act ID. You add the Act ID alongside your description — giving readers a standard reference they can use to compare, map, and classify, without changing how you communicate internally.
Think of it like an ISBN for a book. The book still has a title, an author, and a description. The ISBN is simply a stable, universal reference that makes the book unambiguous in any system.
Which ID do I use? The atomic, bindable unit in ACT-ID v0.3 is the
use-of-proceeds — identifier family ACT-U-XXXXXX.
That's what you reference in a bond framework, SPO annex, or allocation table.
An economic-activity layer (ACT-A-, ISIC/NACE-aligned) sits beneath
for producer-side classification, and is mostly useful for cross-walking to
standard industry codes — not for describing what a bond finances.
Act IDs in practice
Eligible use of proceeds
Reference Act IDs in your eligible use-of-proceeds categories. Your own descriptions and eligibility criteria still apply — the Act ID is added as a standard reference in brackets or alongside.
4. Eligible Use of Proceeds — Renewable Energy
Net proceeds will be allocated to the following eligible activities:
- 4.1 Electricity generation from wind power ACT-U-W4G2UF
Construction, installation, and operation of offshore wind turbines and associated infrastructure. Minimum capacity threshold: 10 MW. - 4.2 Electricity generation using solar photovoltaic technology ACT-U-NHYSFK
Development and operation of utility-scale and commercial solar PV facilities.
SPO annex or activity table
Include an activity mapping table in your SPO annex, linking the issuer's use-of-proceeds categories to Act IDs. This makes the opinion more parseable and provides investors with a direct reference.
| Issuer category | Act ID | Standard activity name | Mapping type |
|---|---|---|---|
| Offshore wind energy projects | ACT-U-W4G2UF | Electricity generation from wind power | Exact |
| Solar installations — utility and commercial | ACT-U-NHYSFK | Electricity generation using solar photovoltaic technology | Exact |
| Urban metro and tram systems | ACT-U-7H1KZ1 | Passenger interurban rail transport | Broader |
Internal holding records
Tag holding records with the Act ID for the financed activity. This lets you aggregate, compare, and report by activity across your labelled bond portfolio.
{
"bond_id": "XS1234567890",
"issuer": "Example Utilities Corp",
"bond_type": "green",
"allocation_date": "2025-06-30",
"activities": [
{
"act_id": "ACT-U-W4G2UF",
"activity_name": "Electricity generation from wind power",
"issuer_category": "Offshore wind energy projects",
"allocation_eur": 120000000,
"allocation_pct": 60.0
},
{
"act_id": "ACT-U-NHYSFK",
"activity_name": "Electricity generation using solar photovoltaic technology",
"issuer_category": "Solar installations",
"allocation_eur": 80000000,
"allocation_pct": 40.0
}
]
} Structured data export
Include Act IDs in structured data exports, APIs, and flat files. This makes your data directly interoperable with any system that understands Act IDs — with no additional translation layer required.
isin,issuer,bond_type,act_id,activity_name,alloc_eur,alloc_pct,report_date XS1234567890,Example Corp A,green,ACT-U-W4G2UF,Electricity generation from wind power,120000000,60.0,2025-06-30 XS1234567890,Example Corp A,green,ACT-U-NHYSFK,Electricity generation using solar photovoltaic technology,80000000,40.0,2025-06-30 XS2345678901,Example Corp B,green,ACT-U-W4G2UF,Electricity generation from wind power,200000000,100.0,2025-06-30
Allocation and impact reporting tables
Reference Act IDs in your allocation and impact reporting tables, alongside your impact indicators. This links your reported data to a standard activity reference for easy comparison across issuers and periods.
| Category | Act ID | Allocation | % of proceeds | Capacity (MW) |
|---|---|---|---|---|
| Offshore wind | ACT-U-W4G2UF | €120m | 60% | 450 MW |
| Solar PV | ACT-U-NHYSFK | €80m | 40% | 220 MW |
| Total | — | €200m | 100% | 670 MW |
What's inside an SPO? — standardised with Act IDs
We analysed real Second Party Opinions and matched their eligible use-of-proceeds categories to canonical use-of-proceeds (ACT-U) in the ACT-ID registry. Below are fictitious SPO documents showing how a provider could present use-of-proceeds assessments using standard ACT-Us — making every framework directly comparable.
Why this matters for investors: Each SPO describes eligible use-of-proceeds differently. With ACT-Us, the same use-of-proceeds — say ACT-U-W4G2UF "Electricity generation from wind power" — is identifiable across every framework, making portfolio-level aggregation possible for the first time.
Where to find Act IDs
Browse the ACT-ID.io registry to find Act IDs for specific activities. You can search by name or browse by sector. Each record includes the Act ID, a description, associated criteria, mappings to external frameworks, and citations showing the provenance of the record.
If an activity you need is not yet in the registry, contact us. The registry is growing and we prioritise activities with active demand from the market.