Share | 01/07/2018
You can download this case study – with additional visual resources including Sample Reports
DEPCOM is a Solar PV Power EPC/O&M services provider that serves a portfolio of large-scale solar farms distributed across the United States. DEPCOM prides itself in adopting new technologies that best serve solar farm owners in their efforts to improve the performance, efficiencies, and overall advancement of their solar energy assets. They were recently listed as a Top 10 Most Inspiring Company from Inc magazine.
DEPCOM has been an early adopter of drone technology to reduce time that managers and crew members are spending in the field, improve overall asset and plant performance, and reduce hazardous and unsafe tasks for crew members.
Measure Ground Control has helped DEPCOM to improve its own management practices while benefiting the end client – solar farm owners.
Lucas Geismar is an Operations Maintenance Manager for DEPCOM. Lucas manages four power plants in four different states – from Connecticut to Texas – and relays that one of the biggest challenges of his job is needing to be in several places at once.
“Crews are pretty small and efficient, but that means that some skills are not present everywhere,” Lucas explains. “Any time a high level of experience is needed, I have to be there.”
Unlike a traditional power plant where you have crews on 24/7 rotating shifts, solar farms require less daily attention, but when attention is needed, it comes in spurts. In other words, if something goes wrong, it’s all hands on deck. But if something goes wrong in more than one plant at the same time, crews and managers are spread thin.
“It’s important for me to be available in the event something goes wrong,” Lucas explains.
A traditional solar farm inspection for one of Lucas’s sites would take several weeks to perform at a size of 74 MW. And that is with Lucas being solely focused on that one task and relying on good weather for the duration of that time frame.
DEPCOM turned to a drone services provider to perform scheduled inspections via aerial thermal imagery, which has helped to reduce the amount of time personnel spend on a single inspection – and away from other duties.
The primary job of the solar O&M provider is ensuring the plant is performing at its optimal level. Performance and minimum output levels must be met – and exceeded – at every opportunity.
One way that output is affected is through necessary plant downtime. The drone inspections reduce the costly consequences of shutting plants down when an isolated issue occurs. Incidents such as blown overhead fuses in a transmission line can be inspected by drones while keeping the plant running.
There are also scheduled inspections that can require scheduled downtime. In the case of an annual substation inspection, the drone is able to perform the inspection without the need to shut it down.
DEPCOM has also found aerial thermography inspections to both meet and enhance the functionality of Imp testing. Measure Ground Control employs a high imagery overlap for all thermal data collection, resulting in less than 20% new data being collected per image. Thermal images are compiled into orthomosaics that remove damage artifacts, such as solar flares, prior to final analysis. All damages flagged are verified manually through a review of several individual thermal images of the damage location.
By mitigating for potential false positive identification via extensive thermal data capture, aerial thermography results have previously been validated by DEPCOM to result in a >98% reporting accuracy.
But the drone flight itself is not the only benefit of drone technology provided by Measure Ground Control. After an inspection is performed, the work of the crew begins as they fix the problems that the drone data captured. Using an in-field repair app that crews can download on their smartphone or tablet, a worker is able to pinpoint exactly where the problem is in the field, reference the issue with that particular panel or string, rectify the issue, and update the data with notes – all while in the field.
“The data we get back from Measure Ground Control is incredibly usable,” Zachary Nichols, Director of O&M at DEPCOM, reflects. He goes on, “Using the app, we’re able to eliminate the need to take handwritten notes in order to document everything that was done at the end of the day. The real-time updates are helpful to management and increase the efficiency of those in the field.”
Safety is a core value at DEPCOM, and traditional solar and substation inspections are dangerous work. A crew member has to suit up in protective clothing, go into the field, and use an amp clamp on each individual circuit.
The safety benefits of drones in solar and other industries has long been established and experienced.
When detecting a blown fuse in an overhead transmission line, DEPCOM did a flyover. This eliminated the need to bring in the bucket truck and send someone up near the power lines.
In just one solar farm inspection, DEPCOM saved 778 manhours, 97% of which were hazardous.
For added context, compared results across four different solar sites (one of which was for DEPCOM). Total hazardous manhours avoided across all four sites were 1,433! Not to mention, efficiencies were increased by 97%.
Solar farms should seek to use technology to defer risk to people and improve plant performance at every opportunity. When outsourcing O&M, favor organizations like DEPCOM who have a proven track record of using drones to increase manager efficiency, improve overall plant performance, and reduce risks to employees.
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