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Geospatial analytics – charting a new path for hydroelectric power

Geospatial analytics – charting a new path for hydroelectric power
(Image credit: 123rf)

By Sean Donegan

While hydropower has a central role to play in the effort to combat climate change, energy companies are increasingly struggling to manage their hydroelectric networks. What they need is a comprehensive view of potential problems.

What they have instead is an imperfect patchwork, with problems often becoming evident only after they’ve spiraled out of control. These issues threaten not just individual energy companies but the health of surrounding communities and the clean energy project as a whole.

The question, then, is what are these companies to do? How can they get a more reliable, more consistent sense of potential points of concern within their networks? A recent collaboration between Georgia Power, the largest electric subsidiary of U.S. utility Southern Company, and Satelytics suggests some answers.

The operations Georgia Power is responsible for managing are vast: the company controls 16 hydroelectric dams across Georgia, which collectively deliver power to more than 2.6 million residents. This entails the monitoring of 59,000 surface acres of water bodies and 100,000 acres of surrounding properties.

Over the past year, they’ve worked closely with Satelytics to inaugurate a new paradigm in hydroelectric dam maintenance. These efforts have yielded excellent results — laying the blueprint for similar initiatives worldwide.

What is geospatial analytics?

Geospatial analytics is an efficient and cost-effective tool that uses multispectral and hyperspectral imagery gathered from satellites, unmanned aerial vehicles, planes and fixed cameras and analyzed to provide alerts and qualitative results for energy organizations.

Because no other sensor platform can capture huge areas of interest as quickly, and transmit the resulting data instantaneously, satellites are normally the primary source of high-resolution data. Data can be gathered daily and results are sent to organizations within hours, including the specific problem, location, magnitude and even qualitative information, which minimizes cost, impact and operational disruption for clients.

The key to identifying these small issues is using satellite imagery with the highest available resolution (30-cmto 3.7-m spatial resolution compared to 25-m to 30-m spatial resolution, which is the current norm) to locate the exact source of the problem before dispatching skilled personnel to investigate and remediate within hours of notification.

Land disturbances, algae and more: challenges of maintaining hydroelectric dams

Before joining up with their vendor, Georgia Power’s monitoring efforts were confined to ground-level, door-to-door scouting. Inspectors traveled from site to site, often by boat, attempting to manually identify problems for remediation.

The range of challenges at play is staggering. Beyond the sheer size of the terrain, there are the ever-present land disturbance threats, which spring up at an alarming rate. Often, private landowners are unaware that special permitting is required for their projects, leading to unrestrained construction that threatens the integrity of surrounding dams.

But the problems go even deeper — beyond what any team of field agents could be expected to identify on its own. Reservoirs are increasingly choked with soil, pollutants and other unwanted debris. Algae and invasive species proliferate in lakes set aside as sources of drinking water.

Hydrilla, in particular, is an intractable problem, harming water quality and other plant life. In worst-case scenarios, hydrilla can grow to the point that it chokes off flow into dams and causes massive damage to the hydroelectric stream.

Before geospatial analytics, these problems would often come to Georgia Power’s attention only after something had already gone wrong. What was needed was a way to pinpoint these problem points early so that remediation efforts could be undertaken as quickly as possible — and with a minimum of damage to the larger system.

Geospatial analytics point the way forward

After partnering with Georgia Power, Satelytics began scheduling quarterly image acquisitions from Airbus’ 50-cm resolution Pléiades 1A/1B satellite.

These ultra-detailed images were analyzed using the vendor’s suite of proprietary change-detection algorithms, which can instantly flag land disturbances, vegetative clearing and signs of construction on land or at the shoreline itself. Crucially, these algorithms were also able to detect aquatic plant growth in the water, at depths unattainable with conventional monitoring technology — upwards of 2 feet in many cases.

Distilled into easily digestible data visualizations, these insights overhauled Georgia Power’s remediation efforts. Instead of having to scout for potential problems — a time-consuming process — field teams could be sent directly to the most problematic areas for remediation efforts. The needle-in-a-haystack scouting that had characterized the old approach was jettisoned in favor of the many benefits geospatial analytics has to offer.

The regularity with which these satellite images are captured and analyzed, and the speed with which results are delivered, have had a major impact on Georgia Power’s operations. In the short period since the partnership began, the number of detected non-compliance issues has surged, with the geospatial analytics tools granting Georgia Power a clear view into areas of its operations it once struggled to get a handle on.

Aquatic vegetation detection by Satelytics along a reservoir and nearby waterways using 50-cm Pléiades imagery from Airbus

Other departments within the utility are now contemplating adoption of this technology for other monitoring applications.

These initiatives matter enormously for Georgia Power, for whom every unaddressed problem represents a potential crisis down the line. It matters for their business, and it matters for the people of Georgia who suffer from the negative consequences of power outages.

We also, of course, need to do everything in our power to ensure the diffusion of hydroelectric power, which is key to a clean energy future. Georgia Power is modeling a new way forward for the industry by demonstrating the role that cutting-edge geospatial analytics can play in safeguarding the health of hydroelectric power networks and their surrounding communities. Instead of wasting energy trying to find the problems, they are dedicating themselves to fixing them.

Sean Donegan is president and chief executive officer of Satelytics. He has over 30 years of technology and software development experience.

This article was originally published on Power Engineering International.