Mercer Island's aging electric infrastructure requires upgrades to ensure a more resilient and reliable power grid that can meet the island's growing energy demands and reduce the risk of potential outages. These improvements will enable PSE to continue delivering safe and reliable power well into the future.

PSE has determined the need to upgrade and replace essential transmission and distribution infrastructure to ensure safe, reliable power for the future. This includes replacing the aging submarine (underwater) cables that provide electricity to Mercer Island.

By investing in these improvements PSE will:

• Reduce the risk of potential outages
• Enhance service reliability for those living and visiting Mercer Island
• Meet future energy demands for decades to come

PSE is currently working on a project design to meet the island’s power needs and will keep the community updated as the design progresses. As this work is in its early stages, you may notice PSE staff and contractors in the area conducting fieldwork, such as soil testing or surveying existing infrastructure.

Project Timeline

• 2024/25: Planning and Design
• 2025/2026: Permitting
• 2027/2028: Construction
• End of 2028/Early 2029: Operations

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