Can Open Loop Geothermal Work on Your Site?
Open loop geothermal has huge potential. It can deliver low-carbon, scalable energy for entire developments, campuses and estates. But it isn't universally viable.
And the real risk isn't the technology. It's committing to it too early before you properly understand the ground, the water, and the constraints that will shape what can actually be delivered on your site.
This page is here to help you sense-check that. Not in theory, but in practical terms.
There's no single test that tells you whether open loop geothermal will work. Viability comes down to how a number of elements come together on your site. The ground conditions, how water moves through them, what your system needs to deliver, and what regulation will allow.
In simple terms, you need the ground to provide enough water, in a way that can be abstracted and reinjected reliably, without causing problems for the system or the surrounding environment.
You also need space to drill, test and operate, and a realistic way of handling water during testing.
If one of those elements isn't quite right, the scheme doesn't necessarily fail. But it does become more complex, more constrained, and often more expensive.
The Ground Still Decides What's Possible
You can have a well-designed system on paper. Strong modelling. A clear decarbonisation strategy. But the ground still decides what's possible.
Aquifers vary. Flow paths aren't always predictable. Historical records are often incomplete. Even in well-understood formations, local conditions can change across a site.
None of that makes open loop unworkable. But it does mean assumptions need to be tested. Where projects tend to struggle is not because something went catastrophically wrong, but because a series of reasonable assumptions didn't hold up once work began.
Groundwater yield turns out to be lower than expected.
Discharge during testing is more constrained than planned.
Borehole locations conflict with unknown infrastructure.
Water chemistry introduces operational challenges.
Licensing conditions limit what can actually be done.
Individually, these are manageable challenges; together, they start to erode viability.
A Practical Example:
This isn't hypothetical. There are schemes where high-yield, high-temperature mine water has been identified and fully modelled. On paper, this looks ideal for an entire district heating system. But when drilling starts, the reality is different. Mine shafts have been backfilled - with no record of it having happened.
The water is there, but the system can't access it in the way expected. The resource exists. The scheme doesn't. That distinction often only becomes clear once work is underway.
What Should You Be Looking For at This Stage?
At feasibility stage, you're not trying to eliminate uncertainty. You're trying to understand where it sits. Some sites give you early confidence. Known productive aquifers, existing borehole data nearby, space to drill and test, and clear options for discharge during testing all point in the right direction.
Others raise questions. Limited geological data, constrained layouts, unclear discharge routes, or a heavy reliance on modelling without any ground validation.
None of these automatically rule a project out. But they do change how it needs to be approached, and how carefully risk needs to be managed.
The earlier you understand any constraints, the easier they are to deal with. At concept stage, changes are relatively straightforward. Later on, they become redesigns, delays and cost increases.
Open loop geothermal isn't inherently high risk. But assuming things will work without properly testing them is!
Where a Delivery Perspective Can Help
By the time drilling and testing start, assumptions have already been made and changing them becomes harder. That's why a practical, delivery-led view is most useful before that point, not to redesign the system, but to sense-check how it will actually be delivered. Whether boreholes can be drilled where they're shown. Whether testing can be carried out properly. Whether the site can support the works without creating unnecessary friction.
That perspective is often brought in later than it should be.
Start With What Will Actually Work
If you're considering open loop geothermal, the most valuable step is to test any assumption early.
Before design is fixed. Before cost is committed. Before risk becomes expensive.
What you're really trying to understand is simple: can this system actually be delivered on your site, under your conditions? If you want a straight, practical view on that, based on what's likely to happen in the ground and on site, we can help you sense-check it.
No over-promising. No guesswork dressed up as certainty.
We'll help you understand what's realistic before anything becomes a problem.
Let's assess your site's potential.