Power utilities run on outside expertise. Metering head-ends, billing engines, customer information systems, network infrastructure - substantial parts of a distribution company's enterprise IT are built, patched and troubleshot by OEM vendors and system integrators under multi-year contracts. Every one of those arrangements translates into privileged access for people the utility does not employ, on systems whose failure is measured in outages and whose data - consumer records at population scale - is measured in trust. The sector's regulators have noticed: supervised vendor access and audit-ready logging are named expectations, with CERT-In directions setting explicit obligations for Indian entities.
The utility access problem in practice
Three patterns dominate. First, standing vendor connectivity: VPN accounts issued at contract start and reviewed, if ever, at contract end - dormant most of the year, unattributable when active, and exactly the entry path implicated in damaging infrastructure breaches worldwide. Second, generational estates: modern applications beside legacy servers and network equipment that accepts no agents, administered through shared device passwords that make individual attribution impossible. Third, evidentiary weakness: when an incident or an audit demands to know what a vendor engineer did on a specific system during a specific window, terminal histories and word-of-mouth are what the utility has.
Why the standing-VPN model cannot be patched
Improvements bolted onto the VPN model - stricter firewall scoping, periodic account reviews - leave its defects intact. Network presence is still granted rather than sessions; credentials still leave the utility's custody; attribution still dissolves at shared logins; and nothing produces a record of the work performed. The model grants trust it cannot verify, to parties it cannot manage, on systems it cannot afford to lose.
The Tanflow approach: access as a bounded, watched event
Tanflow's utilities solution positioning names the pairing directly: vendor access control and CERT-In-ready audit for utility enterprise IT. The mechanics come from the PAM platform's core chain, applied to the vendor pattern:
- Time-boxed windows: Just-in-Time access scopes each engagement to its target and hours - the hardware vendor's RDP to one jump target for Tuesday's maintenance, gone by Wednesday, in Tanflow's own illustration. No standing accounts, no forgotten offboarding.
- Requests with reasons: change management captures who asked, why, and who approved - so every vendor window traces to a documented purpose before it exists.
- Credential custody retained: the vault injects target credentials into the browser session; the vendor engineer authenticates as a named individual with MFA and never sees a password that could travel.
- Complete recording with live supervision: sessions are captured end to end at the gateway, and session sharing lets a utility engineer watch the vendor work live - read-only or interactively - without credentials changing hands.
- Command-level policy: graduated verdicts police the session's content - destructive changes on network devices can terminate the session and alert the SOC; sensitive operations can demand a logged justification.
The zero-agent architecture is what makes this deployable across a utility's mixed estate: SSH and Telnet reach the network and legacy layers, RDP and VNC the Windows systems, database sessions the billing and consumer-data stores - with nothing installed on any target, and the whole platform running on-premises inside the utility's own perimeter. The External Access Monitor then watches for logins that bypass the gateway, closing the route around the control.
An illustrative scenario
Consider a distribution utility whose metering-system OEM performs quarterly maintenance. Under Tanflow, the OEM's request - named engineers, named targets, Saturday window, stated scope - is approved into existence as JIT access tied to the change record. Each session runs recorded and policed, supervised live by the utility's own engineer during critical steps. Sunday morning, the access no longer exists; the evidence does: requests, approvals, replayable sessions, command logs, justifications - the complete file an auditor or an incident review would ask for, generated as a by-product of the work.
Compliance and audit implications
Tanflow's compliance mapping covers the frameworks utility assessments draw on - CERT-In directions, ISO 27001/27002, NIST CSF among them - describing how privileged session recording, access governance and logging capabilities align with their expectations. Consumer-data protection obligations point the same direction: attributable, justified, recorded access to the systems holding consumer records is the control substance behind the policy language.
Conclusion
Utilities cannot reduce their dependence on vendors, but they can end the era of unwatched vendor presence. With Tanflow PAM, third-party access to utility enterprise IT becomes what the sector's regulators have been describing all along: requested with a reason, bounded in time, supervised in flight, recorded in full - and gone the moment the work is done.