In 2025, Marsh & McLennan Companies disclosed key data related to its energy management practices, providing transparency into its operational energy use in line with recognized sustainability reporting frameworks.
Marsh & McLennan Companies disclosed progress toward renewable energy adoption, highlighting the share of total energy sourced from renewable versus non-renewable sources.
| Metric (GJ) | 2025 | 2024 | 2023 | 2022-2019 |
|---|---|---|---|---|
Total Energy Consumption | 862,182a | 821,344a | N/A | |
Non-Renewable Energy Consumption | 367,434a | 384,257a | N/A | |
Renewable Energy Consumption | 494,748a | 437,087a | N/A |
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In 2025, Marsh & McLennan Companies consumed a total of 862,182 Gigajoules of energy across its operations. Of this total, 57.38% was sourced from renewable energy, either derived from natural resources like biofuels, biomass, or biogas, or generated using renewable technologies such as solar or wind power. The remaining 42.62% was classified as non-renewable energy, coming from fossil-based fuels such as coal, natural gas, or crude oil, or from non-renewable generation technologies like nuclear power.a
In 2025, Marsh & McLennan Companies consumed a total of 862,182 Gigajoules of energy, of which 57.38% was derived from renewable sources, including biofuels, biomass, biogas, solar, and wind power.a
This moderate level of renewable energy adoption indicates that Marsh & McLennan Companies is transitioning toward cleaner energy sources, though a significant share of its energy mix still relies on non-renewable inputs.
Since 2019, Marsh & McLennan Companies's total energy consumption decreased by 31.96%, yet rose by 4.97% in 2025, pointing to a potential reversal in recent energy-saving progress.a
Over the same period, the share of renewable energy in Marsh & McLennan Companies's consumption increased by 591.51%, including a 7.83% increase in 2025, showing consistent progress in clean energy adoption.a
Overall, Marsh & McLennan Companies’s energy trends reveal a complex picture, with variations in total consumption and renewable sourcing. A closer examination of operational drivers and sourcing strategies is needed to fully assess the company’s environmental impact.