Powering automation at a remote site is one of those decisions that gets made fast and then lived with for years. Operators across South Texas ask us the same question all the time. Should we trench in line power, or just go solar? The honest answer is that it depends on the site, the load, and how far you are from the nearest service drop. There is no single right answer, but there is usually a clear right answer for any specific well.
After installing and servicing power systems for hundreds of remote automation sites across the Eagle Ford and the surrounding basins, our South Texas field team has a strong opinion on what actually works. Here is the practical breakdown.
When Line Power Is the Right Call
If you have utility power within a reasonable trenching or pole distance, line power is almost always the cheaper long-term choice. You get unlimited capacity, no battery to replace, and one less system that can fail.
Line power makes the most sense when:
- The site is within roughly two miles of an existing service.
- You have heavier loads such as variable frequency drives, larger pumps, or multiple instruments running off the same panel.
- The pad is going to be developed further, with more wells, more compression, or expansion planned over the next few years.
- The operator already has a service agreement with the local co-op or utility that makes new drops fast and predictable.
The trade-off is upfront cost and timeline. Trenching, transformers, easements, and utility paperwork can push a line drop into the six-figure range before you even energize. And in South Texas, utility lead times have stretched well past where they were five years ago. If you need the site online next month, line power may not be on the table even if the math favors it.
When Solar Is the Right Call
Solar is the right answer more often than most operators realize, especially in South Texas. The sun is reliable. The hardware has come down in price. And for the kind of loads a typical automation package draws (a PLC or RTU, a couple of instruments, a radio, and an HMI), solar can carry the site indefinitely with a properly sized panel and battery bank.
Solar makes the most sense when:
- The site is more than two miles from existing utility infrastructure.
- The load is small and stable, which describes most pure automation packages.
- The site needs to come online fast. We can deploy a solar-powered automation package in a fraction of the time a utility drop takes.
- The well is marginal or short-lived, and a permanent utility investment does not pencil out.
The catch is that solar only works if it is sized correctly for the load and the local conditions. This is where we see the most field failures. Underpowered panels, undersized battery banks, and unrealistic assumptions about how many cloudy days South Texas actually gets in February. A solar setup that runs fine in August can struggle in winter if the design did not account for shorter days and seasonal weather.
The Hidden Variables Operators Miss
The line-versus-solar question is not just about distance. A few site-specific factors shift the answer more than most operators expect.
Total connected load. Add up every device on the panel, including spare capacity for the instruments you will add later. Solar can handle most automation loads. It cannot handle a 5 HP motor without serious engineering.
Communication needs. Cellular modems and satellite terminals draw more power than people think. If you are running constant data uplink for SCADA, factor that into your battery sizing.
Heat and dust. South Texas heat shortens battery life, and Eagle Ford dust coats solar panels faster than most data sheets assume. Both shrink the effective output of a solar system over time. Quality components, proper enclosure ventilation, and a maintenance schedule make a real difference.
Expansion plans. A site that starts with one well and one RTU often grows. Solar systems do not scale up as cleanly as a utility drop. If you know the pad is going to triple in load over three years, that changes the math.
Local labor and service response. A solar power system is only as reliable as the team maintaining it. If your service vendor is a four-hour drive away, every outage is more expensive. This is where local presence in South Texas matters.
Hybrid Setups Are Underrated
A lot of South Texas pads do best with a hybrid approach. Line power to the heavy loads at the main pad. Solar-powered RTUs and instrumentation at outlying satellite locations that feed back to the central SCADA. This keeps the high-draw equipment on stable utility power and lets the smaller, distributed sites stay simple, autonomous, and easy to relocate.
We have designed plenty of multi-pad sites in the Eagle Ford where solar handles the satellites and a single line drop powers the main facility. It is often cheaper than running power to every location, and it leaves the operator with flexible building blocks for future expansion.
How to Decide
When operators ask us to size up the right approach for a new site, we work through the same short checklist:
- What is the total connected load today, and what is it likely to be in three years?
- How far is the nearest utility service, and what is the realistic install timeline and cost?
- How critical is uptime, and what does an outage actually cost?
- What does the maintenance picture look like, including the vendor that will be servicing the system?
- Is this site going to live for two years or twenty?
Answer those five honestly and the right power approach is usually obvious. The mistake is making the choice off habit (always solar, or always line) instead of off the site.
The South Texas Reality
South Texas conditions are tougher on power systems than the spec sheets suggest. Heat, humidity near the coast, dust in the western part of the play, and lightning that finds every grounding shortcut. The right solar install survives that. So does the right line setup. The wrong one fails in a way that takes weeks to diagnose and shows up as a SCADA outage, not as a power problem.
That is why we treat power as part of the automation design from day one. Not as a utility decision made before the controls team gets involved.
Compare Power Options for Your Site
If you have a remote automation site coming up and you are weighing solar against line power, our team can run the numbers with you. We will look at the load, the location, the timeline, and the long-term plan, and we will tell you which approach actually pencils out.
Most of the time, one option is clearly better. Sometimes the answer is hybrid. Either way, you walk away with a real recommendation grounded in what we have built and serviced across South Texas.
Compare power options for your site → Contact us