Thesis
The Laja River: water, energy and farming in northern Guanajuato
The Upper Laja River aquifer has 62 hm³ a year more water under concession than it recharges. In northern Guanajuato, a project that produces energy but uses more water is not viable. Five agri-energy models and the rules for doing them right.
Do you have land, a well or a farming operation in the Laja basin?
Let's talkBajío Ventures · July 2026
The upper Laja River basin covers the heart of northern Guanajuato: Dolores Hidalgo, San Miguel de Allende, San Felipe, San Diego de la Unión and San Luis de la Paz. It is a land of vineyards, export vegetables, livestock and agave. It is also one of the most water-stressed territories in Mexico. Any agricultural or energy project in the region has to start from that reality.
1. The starting point: an aquifer in deficit
According to CONAGUA’s latest update (2024), the Cuenca Alta del Río Laja aquifer (code 1108) receives average recharge of 139.7 hm³ a year, but has 201.7 hm³ under concession. The result is a deficit of almost 62 hm³ a year and no volume available for new concessions.
Three more figures to size the challenge:
- Agriculture is the main user. Historically, about 90% of the water extracted has gone to irrigation.
- Water tables have been falling for decades. CONAGUA records drawdowns of 10 to 60 metres between the 1970s and the 1990s, depending on the area.
- Quality matters too. Academic studies have documented arsenic and fluoride in the basin’s groundwater, linked in part to pumping from ever-deeper wells.
What it means: in the Laja, water is the constraint that defines everything else. A project that produces energy but consumes more water is not viable in the long run.
2. Two territories, two strategies
The basin is not uniform. Two zones should be kept apart.
The highlands (2,400–2,900 m). The Sierra de Santa Rosa, between the city of Guanajuato and Dolores Hidalgo, is forest and recharge land. Solar parks do not belong here. What belongs is conservation and restoration: reforestation, soil and water retention works, agroforestry, and small-scale solar for crop drying and community cold chains. The payment-for-ecosystem-services scheme already running around San Miguel de Allende is a replicable model.
The valley (1,900–2,100 m). The plain between Dolores Hidalgo, San Luis de la Paz and San Miguel de Allende has high solar irradiation (on the order of 5.5 to 6 kWh/m² per day), flat terrain and established farming. Here there is room for productive projects that combine energy and agriculture.
3. Five agri-energy models for the valley
| Model | What it is | Why it works here |
|---|---|---|
| Agrivoltaic vineyards | Panels on ~4 m structures along the Wine Route | Less heat stress and evaporation; the structure can carry anti-hail netting |
| Sheep under panels | ~1.5 m structures with grazing and mesquite forage | Uses rain-fed or degraded land; low investment |
| Shaded horticulture | Vegetables and berries under partial shade | Cuts water loss to evaporation; high-value crops |
| Solar pumping with efficient irrigation | Replacing diesel or the farm tariff with solar, plus drip and metering | Water saved is the headline indicator |
| Collection centres with their own power | Solar and batteries at packhouses, cold storage and dairies; biogas from manure | Industrial client with steady load and ability to pay |
4. The rules for doing it right
Water saved comes first. If solar makes pumping cheaper, there is a risk of pumping more. Every pumping project must be tied to metering at the well, compliance with the concessioned volume and conversion to efficient irrigation.
Check the farm tariff case by case. Mexico’s subsidised agricultural power tariff shrinks the savings from solar pumping. The business case is strongest where diesel is used today or where the subsidised quota is exceeded.
Size below 0.7 MW where possible. Under the Electricity Sector Law, plants below that threshold do not need a generation permit: they are treated as distributed generation, which shortens timelines.
Ejido land, assembly agreements. Much of the valley is ejido (communal) land. Agreements have to be built with time and with clear benefits for the ejido members.
Measure to prove it. A pilot with a university partner, metering water, yield and energy, produces the evidence that financiers, government and growers need.
5. An opportunity for the region
Northern Guanajuato has sun, a farming vocation and a water problem that cannot be postponed any longer. Combining energy and agriculture, with water as the central criterion, can raise growers’ income, cut pumping costs and protect the aquifer at the same time. The Laja basin can be where Mexico shows that the energy transition is also a water strategy.
How we help
At Bajío Ventures we identify sites and structure and finance projects that combine energy, water and agriculture: from territorial analysis and the permitting path to pilot design and the investment model.
This article is for information only. The aquifer figures come from CONAGUA’s official publication and should be verified for each site; every project requires its own technical, water and regulatory assessment.
Sources: CONAGUA — Update of mean annual water availability, Cuenca Alta del Río Laja aquifer (1108), Guanajuato (2024) · Ortega-Guerrero, Revista Mexicana de Ciencias Geológicas (2009) — arsenic and fluoride in groundwater · Pulido-Madrigal et al., Terra Latinoamericana (2012) — farming under groundwater overexploitation · Electricity Sector Law (Spanish) · Holland & Knight — Electricity Sector Law regulations (0.7 MW threshold)
Do you have land, a well or a farming operation in the Laja basin?
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