Direct emissions
99,000
tCO2e
H
Hydro One
Explore carbon emissions data for Hydro One. Mycelium helps you review reported emissions, disclosure status, Scope 1, Scope 2 and Scope 3 data, climate targets and sustainability information in one company profile.
This profile brings together available carbon emissions data for Hydro One, including reported figures, modelled estimates, disclosure documents and sustainability indicators, so you can review its emissions and compare its performance against similar companies. Read how we source and check this data.
Emissions
Carbon emissions
Total yearly emissions across all scopes
7,835,571 tCO2e
Scope 1
tCO2e
99,000
Scope 2
tCO2e
2,000
Scope 3 total
tCO2e
7,734,571
Scope 3 reported
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
Provenance
Emissions
Factors
1,599,657
kgCO2e / £M
Supplier specific emission factors (kgCO2e / £M)
Modelled
Reported
Scope 1 + 2
Direct + purchased energy
20,619
20,619
Upstream
+ upstream Scope 3
1,358,038
20,619
Total
+ all Scope 3
1,599,657
20,619
Which figure should I use?
Use Modelled. It is the most complete view: any categories the company hasn't disclosed are filled with industry-typical estimates, so a transparent company isn't unfairly penalised against one that simply hasn't reported.
Reported counts only emissions the company has filed itself. A blank or low Reported cell doesn't mean those emissions don't exist, just that the company hasn't disclosed them.
When Reported sits close to Modelled, that is a positive signal. The company has disclosed most of its salient emissions and there's little gap for the model to fill. Even then, Modelled is the right figure to use for a like-for-like comparison across companies.
Sustainability
Snapshot
Based on reported data, retrieved with AI
- Hydro One reported 7,835,571 tCO₂e in 2024.
- Scope 3 accounted for 99% of emissions.
According to available emissions disclosures, Hydro One reported total yearly emissions of 7,835,571 tCO₂e in 2024. Scope 3 emissions accounted for 99% of reported output, indicating supply chain activity, purchased goods and services, business travel, and wider operational dependencies were the most significant contributors to the company's carbon footprint.
The company achieved a Mycelium Score of 0.3, placing it well below average for its sector for sustainability performance, and received a transparency score of 11.0, pointing to very little public detail on their key emissions.
Total Emissions across all scopes
7,835,571 tCO2e
Scope 1 emissions
Direct emissions from sources the company owns or controls, such as fuel use, facilities and vehicles.
Scope 2 emissions
Indirect emissions from purchased energy, including electricity, heating and cooling.
Location based
2,000
tCO2eMarket based
–
tCO2eScope 3 emissions
Wider value chain emissions across the 15 GHG Protocol categories, from purchased goods and business travel to investments, where reported.
Cat 1
Purchased goods & services
5,474,418
tCO2eCat 2
Capital goods
153,805
tCO2eCat 3
Fuel & energy related activities
153,805
tCO2eCat 4
Upstream transportation & distribution
153,805
tCO2eCat 5
Waste generated in operations
153,805
tCO2eCat 6
Business travel
153,805
tCO2eCat 7
Employee commuting
153,805
tCO2eCat 8
Upstream leased assets
153,805
tCO2eCat 9
Downstream transportation & distribution
153,805
tCO2eCat 10
Processing of sold products
153,805
tCO2eCat 11
Use of sold products
260,687
tCO2eCat 12
End-of-life treatment of sold products
153,805
tCO2eCat 13
Downstream leased assets
153,805
tCO2eCat 14
Franchises
153,805
tCO2eCat 15
Investments
153,805
tCO2e15 values were derived via Mycelium's normalisation process rather than reported by the company. Cells marked “–” were not disclosed.
Contact Info
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How scoring works
How the Mycelium Score is calculated
The Mycelium Score is out of 10. Up to 6.5 points reflect carbon intensity vs sector peers (emissions normalised against revenue). The remaining 3.5 reflect data quality: third-party verified, profile claimed by the company, and full disclosure across all reporting categories.
A higher score means lower carbon intensity than sector peers, backed by data that's third-party verified, claimed by the company, and fully disclosed. Hydro One's score sits at the top of this page and in the score panel.
How the Transparency Score is calculated
The Transparency Score measures how much of a company's key emissions data is publicly disclosed, graded from A (very high) down to F (very low). Crucially, it weights each gap by how material that bucket is for the company's industry, so an undisclosed category where the bulk of emissions sit hurts far more than a minor one.
For Hydro One, the single biggest gap is Purchased goods & services (Scope 3 Category 1). Mycelium estimates it accounts for around 70% of the company's total footprint, typically the largest source of emissions for a Infrastructure company, yet it hasn't been disclosed. Leaving a bucket this large unreported is what's holding the transparency score down.
Other material categories Hydro One hasn't disclosed:
- Use of sold products (Scope 3 Category 11), around 3% of the estimated footprint
In total, roughly 73% of Hydro One's estimated emissions sit in categories it hasn't reported. Disclosing these would be the fastest way to raise the transparency score.
Read the full scoring methodology
Our white paper covers exactly how the Mycelium Score and Transparency Score are calculated, including the normalisation process and what earns a 10/10.
Download the white paper (PDF)
Hydro One carbon emissions FAQs
What are Hydro One's carbon emissions?
In its 2024 reporting year, Hydro One disclosed total emissions of 7,835,571 tCO2e across all scopes. Scope 3 accounted for the largest share, around 99% of the total.
Does Hydro One report Scope 1, Scope 2 and Scope 3 emissions?
For 2024, Hydro One's available disclosure covers Scope 1 (99,000 tCO2e), Scope 2 (2,000 tCO2e). Figures not reported by the company are shown as modelled estimates and labelled as such.
How transparent is Hydro One's emissions reporting?
Hydro One has a Mycelium transparency score of 11 out of 100. The score weights each emissions category by how material it is for the company's industry, so it reflects whether the disclosures that matter most have been made.
Is Hydro One sustainable?
Mycelium measures sustainability through carbon emissions data rather than giving a yes or no verdict. Hydro One has a Mycelium Score of 0.3 out of 10, which reflects its emissions intensity against sector peers together with how transparent and well-verified its reporting is. The emissions figures, disclosure documents and climate targets on this page give the fuller picture.
Is Hydro One environmentally friendly?
Carbon emissions are one measurable part of environmental impact, and the part Mycelium tracks. Hydro One disclosed 7,835,571 tCO2e for 2024, and its Mycelium Score of 0.3 out of 10 shows how that performance compares with similar companies in its sector.
Learn more about our methodology and where this data comes from.
