Solar panels above the grove: energy without cutting trees?

In Türkiye, any sentence that places olive groves next to energy tends to end in the same place: will the trees be cut? That has been the axis of the argument from Law 3573 onwards — we traced the legislative history separately.

An installation completed in Spain this year frames the question from the other side: what if the trees stay?

What was built at Vilches

At Vilches, in the Andalusian province of Jaén, an olive oil bottler has erected solar modules on steel structures above a grove still in production.

No trees were removed. The grove stays in production; the panels sit above it.

Why four metres?

The decisive engineering choice here is not the array's capacity but its height — and the height is set by a machine, not by the trees.

Modern groves in the area are kept at roughly two metres. But the straddle harvester that clamps each trunk and shakes the fruit loose reaches close to 3.5 metres at full stretch. Lifting the module table to four metres leaves the clearance the machine needs to keep working between the rows.

In an agrivoltaic grove, then, the binding constraint is not "how tall does the tree grow" but "how tall does the harvester open". That ties the system directly to hedgerow planting: this geometry cannot be built over a traditional grove with large, spreading canopies.

The research behind it

Vilches is an application; the calculation came first, from the University of Córdoba. A modelling study published in the Journal of Cleaner Production (Marta Varo Martínez and colleagues) tested agrivoltaic geometry over hedgerow olive orchards across 81 combinations: axis heights of 2.5-3.5 m and panel widths of 2-4 m.

The central tension the model found:

• As row spacing widens, radiation reaching the panels rises and electricity output goes up.
• The same move reduces the number of olive hedgerows per hectare, so oil output falls.
• The highest oil yield per hedgerow comes at the widest spacing; the highest oil yield per hectare does not.

Design in an agrivoltaic grove is therefore the geometric answer to a question: how much of each output are we willing to give up?

In the study's headline scenario — hedgerows 10 m apart with 3 m wide, 3 m high trackers — annual output per hectare was:

The researchers conclude that joint production is more efficient than conducting the two activities separately. "Efficient" here refers to land use — total value from a unit of land — not to the grove's own yield increasing.

What the numbers say: which crop is the real crop?

Placing the model's two outputs side by side at current prices changes the picture. The Spanish producer price for extra virgin olive oil is €3.4977/kg (23.08.2026):

That last row is this article's real finding. For the electricity to break even with a year's oil revenue, only €3.10 per megawatt-hour is needed. Actual wholesale prices sit far above that: even at a conservative €40/MWh, electricity revenue reaches €35,640 per hectare — roughly 13 times the oil revenue.

Turkish prices do not change the picture. Extra virgin olive oil traded at TRY 254.33/kg on the Edremit exchange (25.08.2026); at a euro rate of 55.91 that is €4.55/kg, above the Spanish level. Even so, 789 kg yields about €3,590 — still small beside the electricity.

The conclusion that follows is not technical but political: in this geometry the grove becomes the secondary crop in economic terms. For the investor the revenue is in the panels; the olives are a by-product.

That does not make agrivoltaics a bad idea — but it is a critical warning for protection legislation. If more than 90% of revenue comes from electricity, the difference between "an energy investment that protects the grove" and "an energy investment that uses the grove as a pretext" lies in the maintenance and yield commitments written into the contract. Without an inspection regime that guarantees the grove is genuinely kept in production, a four-metre table can easily become a formality.

Why this matters for Türkiye

In Türkiye the grove-versus-energy debate has largely run through the removal of trees. The extent to which mining and energy investment may take place on olive-grove land has been the subject of a legislative sequence running from 3573 to 7554; we also worked through the ten-year arithmetic of clearing a grove.

Agrivoltaics shifts the axis: the question stops being "groves or energy" and becomes "can the same parcel carry both?" The Spanish case shows that it is technically possible.

Transferring it here, however, requires four things:

1. Orchard structure. The system assumes hedgerow planting and mechanical harvest. Most Turkish groves remain traditional, large-canopied and hand- or pole-harvested. A four-metre table means nothing over those.

2. Capital. A 3.65 MWp array plus a 3 MWh battery is the scale of a cooperative or an integrated business, not an individual grower.

3. Legal status. The standing of permanent steel structures and a grid connection on agricultural land has to be settled alongside olive-grove legislation. Otherwise a practice that protects groves could fall foul of the protection rules.

4. Long-run data. Vilches is a single, new installation. What partial shading does to multi-year yield, alternate bearing and fruit quality has not yet been observed in the field.

Reading it cautiously

The modelling results are strong, but they are simulation. The olive is light-sensitive and shows alternate bearing: heavy one year, light the next. Understanding what partial shade does to that cycle takes several seasons of measurement. How the phenolic profile — the character of the oil — behaves under shade is a separate question again.

The direction is nonetheless clear: a model that does not set energy against olive groves is no longer theoretical; it is standing in a field. Türkiye's irradiance is no lower than Andalusia's. What is missing is not the geometry but the orchard structure and the legal framework.

Sources

• Agrivoltaic installation at Vilches (Jaén): project technical data, advised by the University of Jaén, 2026.
• Varo Martínez M. et al. Simulation model for electrical and agricultural productivity of an olive hedgerow agrivoltaic system. Journal of Cleaner Production. University of Córdoba.
• Turkish olive-grove legislation and mining: zeytin.net, legislative history from 3573 to 7554.