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Sector rankings

Most Sustainable Energy Supply / Utilities Companies 2026

20 Energy Supply / Utilities companies ranked 0–100 on real environmental impact using SINK's open formula.

20
Companies ranked
37
Sector average
51
Sector best (ScottishPower)
Full ranking
1
ScottishPowerMaking progress
51
2
VERBUNDMaking progress
48
3
EcotricityBelow expectations
45
4
SSE plcBelow expectations
44
5
OVO EnergyBelow expectations
42
6
E.ONBelow expectations
41
7
Vattenfall ABBelow expectations
40
8
Octopus Energy GroupBelow expectations
39
9
Enel S.p.A.Below expectations
38
10
IberdrolaBelow expectations
38
11
CentricaBelow expectations
38
12
National GridBelow expectations
37
13
Électricité de France (EDF)Below expectations
36
14
ENGIEBelow expectations
34
15
DCCBelow expectations
34
16
Eesti EnergiaBelow expectations
31
17
British GasSignificant gaps
30
18
NextEra EnergySignificant gaps
28
19
Southern CompanySignificant gaps
25
20
Duke EnergySignificant gaps
25
Frequently asked

Energy Supply / Utilities sustainability, answered.

Which Energy Supply / Utilities company is the most sustainable?

ScottishPower is the highest-scoring Energy Supply / Utilities company on SINK with a score of 51/100 (Making progress).

What is the average sustainability score for Energy Supply / Utilities companies?

The average SINK score across 20 Energy Supply / Utilities companies is 37/100. The average across all 847 scored companies is 38/100.

How does SINK rate Energy Supply / Utilities companies?

SINK scores Energy Supply / Utilities companies on 10 questions using public data: Scope 1/2/3 carbon footprint, energy source, nature and biodiversity, resource use, water impact, emissions trajectory, science-based targets, transparency, and major controversies. The formula adjusts for the industry's inherent environmental footprint and company scale.

Which Energy Supply / Utilities company has the worst sustainability score?

Duke Energy has the lowest SINK score among Energy Supply / Utilities companies at 25/100 (Significant gaps).

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