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

1. No. 1 · Score 95.8

   Cato Networks

   Cloud-native SASE / SD-WAN provider · 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.

   Evidence caveats: Energy and utilities: Partial

   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 92.3

   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 ↗

3. No. 3 · Score 92.3

   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.

   Evidence caveats: Energy and utilities: Partial

   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 ↗

4. No. 4 · Score 92.3

   Comcast Business / Masergy

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

   Grid telemetry and SCADA communications are more sensitive to latency and packet loss than most enterprise traffic, so the cost of a network problem being discovered after it has already affected those systems is significantly higher than the cost of catching it beforehand. Masergy's AIOps capability (inherited by Comcast Business) is built around that, helping to identify degradation patterns before a connection fails, giving operations teams time to reroute or intervene rather than respond.

   The fully managed or co-managed model also suits OT teams whose primary focus is running infrastructure, not managing the network that carries it.

   Evidence caveats: Energy and utilities: Partial

   Watch out: Comcast's operational depth is North American by origin, and outside that region delivery runs through partners. The monitoring consistency, field support response times and AIOps depth that a North American reference site demonstrates may not carry over to European or Middle Eastern assets delivered through those partnerships - worth asking specifically how the service is structured at each international location, not just whether it's available.

   Contact Comcast Business / Masergy via Netify ↗

5. No. 5 · Score 92.3

   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.

   Evidence caveats: Energy and utilities: Partial

   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 ↗

6. No. 6 · Score 92.3

   Orange Business

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

   Orange Business has NOC depth and field engineering across Europe and Africa that few managed providers can match at comparable coverage levels. For energy organisations with assets in those regions, the value is local operational teams who understand local conditions - regulatory environments, infrastructure constraints, field access logistics - rather than a remote team managing everything from elsewhere. Getting an engineer to a remote generation facility or transmission asset in a secondary market through a partnership model is a qualitatively different proposition.

   Managed segmentation capabilities support the separation of OT from enterprise traffic, and the service model is built for the governance complexity of multinational critical infrastructure estates.

   Evidence caveats: Energy and utilities: Partial

   Watch out: the platform Orange deploys depends on the vendor selected, and OT security capability - protocol awareness, industrial threat detection, compliance reporting - varies across the portfolio. Platform fit for energy environments needs evaluating against what's actually being proposed for each specific site. Orange's overall managed service positioning is not a substitute for that assessment.

   Contact Orange Business via Netify ↗

7. No. 7 · Score 92.3

   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.

   Evidence caveats: Energy and utilities: Partial

   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 ↗

8. No. 8 · Score 92.3

   Verizon Business

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

   Verizon's wireless network is the differentiator for remote site resilience. Substations, field operations centres and renewable generation sites that sit beyond reliable fixed-line coverage can get integrated LTE and 5G backup alongside managed SD-WAN, rather than requiring a separate cellular solution bolted on afterwards. Carrier-grade infrastructure supports availability requirements for critical telemetry and control traffic, and managed SASE adds segmentation between operational systems and enterprise environments.

   Evidence caveats: Energy and utilities: Partial

   Watch out: the underlying platform is largely Versa-based, and for utilities whose wider estate or OT security tooling is built around a different technology, maintaining consistent segmentation policy across both creates reconciliation work for the operations team. OT change windows in energy environments are infrequent - the integration planning between Versa's IT/OT segmentation model and the existing estate needs to happen well before deployment, not surface during it.

   Contact Verizon Business via Netify ↗

9. No. 9 · Score 91.1

   Colt Technology Services

   Enterprise managed SD-WAN / connectivity provider · Typical deployment: months

   European energy operators working to NIS2 obligations will find Colt's data sovereignty positioning more directly applicable than most on this list. Colt controls the physical network path across European business districts, which means demonstrating in-region processing to regulators or auditors doesn't depend on mapping data flows through third-party infrastructure with its own jurisdictional questions. Cloud on-ramp connectivity into European cloud regions is also more direct as a result, useful where operational data needs to reach cloud-based monitoring or analytics platforms without leaving the regulatory perimeter.

   Evidence caveats: Energy and utilities: Partial

   Watch out: outside Europe, Colt's depth thins considerably relative to the largest global carriers. A utility with assets in North America, the Middle East or Asia has those sites sitting outside Colt's primary operational strength. Local network coverage, cellular backup and field support at those locations need a separate assessment - for a globally distributed energy estate, the European strengths need to be weighed explicitly against what a different provider would offer elsewhere, not assumed to travel.

   Contact Colt Technology Services via Netify ↗

10. No. 10 · Score 89.9

    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.

    Evidence caveats: Energy and utilities: Partial

    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 ↗

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.