Tender: Portsmouth Water Telephony and Resilience Upgrade — Secure Digital Network for Approximately 48 Sites

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Portsmouth Water is seeking a supplier to improve and extend its telephony and resilience capability by moving away from PSTN lines to a secure, longer-lasting digital communication network that delivers continuous, secure connectivity for Critical National Infrastructure across approximately 48 sites. The contract must deliver initial work by January 2027 and provide goods and services to support Portsmouth Water’s operational and IT needs at least until August 2030 and potentially to August 2035. The required network will provide seamless point-to-point connectivity, the ability to segregate, prioritise and reliably carry data for critical systems including Telemetry (GEOSCADA), CCTV, solar arrays and inter-site operational process data, and will be supported by a Service Level Agreement to guarantee responsive support. The contractor must collaborate with existing suppliers as required and work with Portsmouth Water to establish a single supply chain provider without interrupting existing service.