Methane Gas Capture and Electricity Production at Kubratovo Wastewater Treatment Plant Sofia Bulgaria

Bulgaria · Proponent: Sofiyska voda AD

Wastewater Methane project in Bulgaria, listed on the Gold Standard registry. 698,624 t issued so far, 72.8% of them retired.

Issued: 699K; tCO₂e
Retired: 508K; 72.8% of issued
Outstanding: 190K; tCO₂e
First issuance: 2017; first retirement 2018

Canonical record

Every field, with its source

Registry page ↗

Registry: Gold Standard; via CarbonPlan OffsetsDB, originally Gold Standard
Project ID: GLD4238; via CarbonPlan OffsetsDB, originally Gold Standard
Methodology: ams-i-c; via CarbonPlan OffsetsDB, originally Gold Standard
Category: Fuel switching; via CarbonPlan OffsetsDB, originally Gold Standard
Type: Wastewater Methane; via CarbonPlan OffsetsDB, originally Gold Standard
Country: Bulgaria; via CarbonPlan OffsetsDB, originally Gold Standard
Region: Europe; via CarbonPlan OffsetsDB, originally Gold Standard
Status: Unknown; via CarbonPlan OffsetsDB, originally Gold Standard
Proponent: Sofiyska voda AD; via CarbonPlan OffsetsDB, originally Gold Standard

Price & fair value

The same credit, very different prices.

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Quality framework

Six signals we assess for every project

How we score →

Methodology risk

In the record

How robust the crediting method isams-i-c

Vintage

In the record

When credits were first issuedPost-2016 issuance

Country governance

In the record

Host-country risk indexIndex for Bulgaria

Permanence

In the record

Risk that stored carbon is releasedTechnology or avoidance

Source reliability

In the record

How trustworthy each source isGold Standard registry

Cross-registry check

In the platform

Same credits listed twice?Screened across 6 sources

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Source data: CarbonPlan OffsetsDB (carbonplan.org/research/offsets-db). Project types incorporate the Voluntary Registry Offsets Database, Berkeley Carbon Trading Project, CC BY 4.0. Signals and summaries are derived by QAVCM. Data as of 2026-10-02.

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