Best SD-WAN and SASE providers for energy and utilities (2026)

1. No. 1 · Score 95.8

   Cato Networks

   Cloud-native SASE / SD-WAN platform · Typical deployment: hours

   The IT/OT boundary is one of the most pressing issues for the energy and utilities sector, though Cato is well positioned to address this - rather than placing a firewall between two separately managed network layers (like many other solutions on the market), Cato enforces micro-segmentation through one policy engine - control systems, SCADA traffic and enterprise IT coexist on the same WAN fabric, isolated from each other by policy rather than physical separation.

   For NERC CIP and NIS2 compliance, centralised policy management and consistent audit logging across distributed substations and generation assets simplifies the evidence-gathering that makes compliance programmes operationally painful at scale.

   Watch out: utilities running specialised OT security tooling - protocol-aware inspection, industrial monitoring platforms - need to validate integration with Cato's architecture before committing. The single-vendor model assumes a degree of centralised control that not every operational technology environment is structured to give, and discovering that mismatch during rollout rather than before it is an avoidable problem.

   Contact Cato Networks via Netify ↗

2. No. 2 · Score 92.4

   Fortinet

   Secure SD-WAN / SASE technology vendor · Typical deployment: days

   Native convergence of networking and security on a single operating system (FortiOS) across FortiGate edge, FortiManager and FortiSASE.

   Watch out: Like Cisco, managed delivery is via partners rather than Fortinet directly; underlay and field operations are not owned by the vendor.

   Contact Fortinet via Netify ↗

3. No. 3 · Score 92.1

   Palo Alto Networks

   SD-WAN / SASE technology vendor · Typical deployment: weeks

   Prisma SASE converges SD-WAN, cloud-delivered security, and digital experience management (ADEM) under a single platform identity.

   Watch out: Premium pricing relative to firewall-led SD-WAN vendors; commercial model requires careful scoping by users, bandwidth, locations and term.

   Contact Palo Alto Networks via Netify ↗

4. No. 4 · Score 90.2

   Versa Networks

   SD-WAN / SASE technology vendor · Typical deployment: weeks

   Multi-tenancy from the ground up, making Versa a common choice for service providers and carriers building managed SD-WAN and SASE platforms.

   Evidence caveats: Energy and utilities: Partial

   Watch out: Less well-known to enterprise buyers as a direct purchase; most enterprise consumption is via service providers.

   Contact Versa Networks via Netify ↗

5. No. 5 · Score 89.4

   Aryaka

   Managed SD-WAN / SASE provider · Typical deployment: days

   Aryaka's private global core network is the architectural differentiator here. Rather than running across public internet paths, the underlay is Aryaka's own backbone, which gives it a different resilience profile from most managed SD-WAN providers - relevant for energy operators where a connectivity interruption at an operational site has consequences that go well beyond a delayed email. WAN optimisation built into that backbone keeps telemetry and monitoring applications performing consistently across dispersed assets.

   Deployment in days rather than months is also a genuine advantage for utilities bringing new generation assets online quickly or extending coverage to remote field locations on short timelines.

   Watch out: Aryaka's PoP footprint is smaller than the hyperscale SASE vendors. For a utility with assets in remote or less common locations - offshore facilities, rural generation sites, secondary industrial regions - coverage needs checking against the actual site list. Satellite integration options and local technical assistance for critical infrastructure environments should also be confirmed before deployment, not after.

   Contact Aryaka via Netify ↗

6. No. 6 · Score 89.4

   HPE Aruba Networking

   SD-WAN / SSE / branch technology vendor · Typical deployment: days

   EdgeConnect SD-WAN (acquired with Silver Peak) is positioned as the foundation for single-vendor SASE alongside Aruba SSE.

   Evidence caveats: Energy and utilities: Partial

   Watch out: Aruba SSE is newer than the SSE leaders (Zscaler, Netskope); buyers wanting best-of-breed SASE should evaluate the SSE capability set carefully.

   Contact HPE Aruba Networking via Netify ↗

7. No. 7 · Score 88.6

   NTT DATA / NTT Ltd.

   Global managed network provider · Typical deployment: months

   Large energy organisations with generation, transmission and distribution assets across multiple countries face a governance problem as much as a connectivity one: different regions end up with different security policies, different monitoring standards and different compliance postures, often because they were set up at different times by different teams. NTT's 24x7 global operations centres are oriented toward standardising that picture across the whole estate, with a portal that gives central teams visibility regardless of geography.

   For NERC CIP and NIS2 compliance programmes, that centralised audit trail is directly relevant.

   Watch out: NTT doesn't build its own platform. The managed service wraps around Palo Alto, Zscaler and others, so OT security capability and industrial protocol handling depend entirely on which platform sits underneath a given deployment. NTT's overall score reflects managed service quality - the technology fit for SCADA environments is a separate question that needs answering against the specific platform, not NTT's overall score.

   Contact NTT DATA / NTT Ltd. via Netify ↗

8. No. 8 · Score 88

   BT Business / BT Global

   Global/UK managed SD-WAN / SASE provider · Typical deployment: weeks

   When a connection to a substation or water treatment facility degrades, the speed of fault resolution depends entirely on who owns the access infrastructure. BT's field engineers deal with BT's own circuits - there's no third-party access provider to coordinate with, which shortens the time between a fault being raised and someone actively diagnosing it. For sites running operational systems rather than office applications, that difference matters more than it might look on paper.

   BT's NIS2-relevant operational presence across critical national infrastructure also makes it a recognised supplier in regulated energy and utilities procurement in the UK.

   Watch out: BT's SD-WAN portfolio runs on multiple underlying platforms, and OT protocol visibility, industrial threat detection and compliance reporting capability are not the same across them. The platform proposed for a substation should be evaluated against the OT requirements of that specific environment - it's not interchangeable with what works at a corporate office, even if both are delivered under the same managed service contract.

   Contact BT Business / BT Global via Netify ↗

9. No. 9 · Score 87

   Telefónica Tech

   Global managed SD-WAN / SASE provider · Typical deployment: months

   Telefónica Tech's Cisco-based converged service carries particular relevance for energy operators with assets in Spain, Latin America or wider Europe where Telefónica's carrier footprint is established. Cisco's segmentation frameworks have supported policy-driven VRF isolation between OT and enterprise IT for a long time - it's an established capability in the architecture rather than a recent addition, which matters in environments where the technology underpinning OT segmentation needs to be proven rather than new.

   Telefónica's regional presence also supports data residency obligations in markets where energy sector data is subject to specific local regulatory requirements.

   Watch out: a Cisco-led platform works well where the organisation's engineering teams already operate within Cisco's model. Where OT security monitoring or industrial threat detection comes from a vendor whose tools don't integrate cleanly with Cisco's architecture, that integration effort needs scoping before deployment - in energy environments, change windows for operational systems are infrequent and tightly controlled, and the consequences of getting the integration wrong aren't limited to IT.

   Contact Telefónica Tech via Netify ↗

10. No. 10 · Score 86.7

    AT&T Business

    Global carrier managed SD-WAN / SASE provider · Typical deployment: months

    Substations, solar farms, pipeline monitoring stations and wind generation assets have a connectivity problem that office buildings don't: fixed-line circuits are often unavailable or unreliable, and there's no alternative when the connection drops. AT&T's LTE and 5G network alongside its fixed-line portfolio means resilient communications for those remote assets don't have to depend on a single underlay technology.

    Multi-vendor security options, Fortinet for AT&T SASE being one, support Zero Trust segmentation between SCADA environments, operational systems and corporate networks.

    Evidence caveats: Energy and utilities: Partial

    Watch out: the platform proposed varies by service tier, and OT security capabilities and compliance reporting features differ between them. A utility running legacy substations and modern generation facilities on the same contract may end up with different segmentation models at different sites - in energy environments, that inconsistency carries operational and safety implications that aren't present in a typical enterprise rollout. Pin down the platform per site early.

    Contact AT&T Business via Netify ↗

Scores are weighted across 40 capabilities with points accrued based on: yes 1.0, via partner 0.75, via managed service 0.65, partial 0.5, not confirmed 0.15, not primary 0. Extended dimensions are indicative desk research; confirm via RFP.