The gap between construction and long-term operations
Most offshore wind assets are commissioned with tight, well-documented work control because the EPC contractor and warranty period demand it. What happens after handover is less consistent. As turbines, arrays and substations move into long-term O&M, the discipline that governed construction — who is authorised to work, what's isolated, what else is happening nearby — often reverts to spreadsheets, paper isolation certificates, and permits tracked by whoever happens to be on the O&M vessel that week. Control of work software offshore wind operators evaluate at this stage isn't a feature list. It's a question of whether the operating model built for construction survives into a twenty-five-year operational life.
What control of work software does
Control of work software manages the full lifecycle of a task on a live asset: who is authorised to raise and accept a permit, what isolations protect the work, what else is happening concurrently that could conflict, and what the complete record looks like afterwards. It sits above permit-to-work — which governs a single task — and above a CMMS, which schedules and records maintenance activity. Control of work is the layer that coordinates people, isolations and concurrent operations across an entire site at any given moment.
That distinction matters more in offshore wind than the terminology suggests. A CMMS can tell you a gearbox inspection is due on turbine WTG14. It won't tell you that a technician is already isolating the same turbine's low-voltage supply, or that a cable-laying vessel is working the adjacent array cable route and needs to know before anyone opens a switchgear panel. That's control of work, and it's a distinct discipline from permit-to-work and CMMS rather than a variant of either — a distinction the next piece in this series looks at in more detail.
Why offshore wind's operating constraints change the calculation
Oil and gas platforms and offshore wind farms share some hazards — high voltage, confined access, work at height — but the operating pattern is different in ways that matter for how control of work gets designed.
Access is weather-dependent and vessel-constrained. A CTV crew that misses its transfer window loses the day; an SOV-based campaign that misses a weather window can lose several. Every hour spent resolving a permit conflict or chasing a missing isolation sign-off is an hour of vessel time and technician transit that doesn't come back. On assets with limited weather windows, the cost of a delayed or reissued permit is measured in vessel day rates, not just administrative friction.
High-voltage work is distributed across the site rather than concentrated in a process plant. Array cable terminations, transformer bays in offshore substations, and turbine nacelle switchgear all carry live electrical risk, often worked on by different contractor teams who may never meet in person. An isolation register that exists only on paper, or only in one contractor's own system, has no way of showing a second contractor that a circuit is already isolated for someone else's work — or of stopping that isolation being removed while a dependent job is still live.
And O&M contracts frequently involve multiple parties on site at once — the operator's own technicians, the turbine OEM's service team, a marine coordinator, and a specialist contractor for high-voltage or blade work. Where these parties run separate permit processes, visibility of concurrent activity depends on someone manually cross-checking whiteboards or spreadsheets, which is exactly the kind of gap why permit to work needs SIMOPS visibility describes for concurrent operations on any hazardous site.
Where the value actually shows up
The case for digital control of work in offshore wind O&M breaks down into three fairly distinct benefits, and they don't all land on the same stakeholder.
For safety, the value is in making concurrent risk visible before work starts rather than discovering it mid-task — a live isolation register that's linked to every permit referencing it, rather than a certificate filed separately from the permit it protects. We've written before about isolation management as a SIMOPS blind spot, and the same failure mode applies wherever isolations and permits are tracked in different places, whatever the asset.
For efficiency, the value is in reducing the time spent on permit turnaround and shift handover when a job runs across a crew change or a vessel transfer. Digital control of work: connecting the system covers what that integration looks like when the permit system, isolation register and asset hierarchy are actually connected rather than bridged by someone re-entering data.
For auditability, the value is in being able to reconstruct exactly what happened on a given permit — who accepted it, what was isolated, whether it was suspended or extended, and what changed and when — without relying on whoever wrote the paper record still being available to explain it. Insurers and regulators asking for evidence of a functioning safety management system are, in practice, asking whether that record exists and can be produced quickly.
What to check before assuming a system delivers this
A feature list won't tell you whether a system actually handles offshore wind's operating pattern. Some more useful tests: ask a vendor to show a permit that spans a shift change on an SOV, with the handover recorded rather than assumed. Ask what happens if two contractors try to work on isolations linked to the same switchgear at the same time. Ask whether a suspended permit — common where weather stops work partway through a task — retains its full history when it's reopened, or whether the record starts again. None of these are exotic scenarios in offshore wind O&M; they're closer to the normal week.
If you're reviewing how control of work is currently managed across your O&M contracts, it's worth mapping the existing process — permits, isolations, contractor handovers — before assuming a digital system needs to replicate it exactly. Often the gaps only become visible once that map exists.