In a rare agrivoltaic handoff, Japan’s rice field finishes its job at harvest and the solar panels above it immediately change shifts, tilting away from crop-friendly positions and starting to chase the autumn Sun for themselves

Solar farms typically chase sunlight for an entire year. However, this does not apply to this one.

This site combines both uses. The racking was installed 3.8 m (12.5 ft) above the ground, providing sufficient clearance for agricultural equipment to operate beneath the panels.

Although the panels produce electricity during most of the growing season, their positions are determined by the crop below. The amount of light reaching the field is carefully managed.

Thus, the panels are incorporated into the agricultural process as opposed to being a typical solar farm.

The field remains farmland even when the panels take control

The term Agrivoltaics represents the combination of agriculture and solar electric power generation using the same parcel of land. The arrangement requires compromise.

Rice crops require sufficient sunlight to be successful during each growing season. In addition, when the panels directly above them receive sunlight, they generate electricity. Those objectives do not always align.

For much of the year, the solar installation operates with the crop in mind. The position of the panels is adjusted in order to facilitate agricultural production instead of pursuing all available kWh of electricity generation.

The field remains farmland throughout the growing season, illustrating the fundamental premise of agrivoltaics.

Just because there is solar equipment placed above a field does not mean that it ceases to be farmland. Instead, the technology adjusts itself based upon the agricultural calendar.

For several months prior to harvesting, the rice crop dictates how the space is utilized. Harvest marks a transition in how the panels operate.

After harvest, the panels stop working for the rice crop

The transition begins immediately after the rice crop is collected. The field is no longer an active growing area, and the panels enter a different operating mode.

Positioning decisions made regarding the panels are made with consideration of crop needs during the growing season. Following harvest, these considerations take on significantly less importance.

The solar array can now focus on electricity production.

With fewer restrictions as a result of crop requirements, the solar array now has greater latitude to position itself in such a way as to maximize exposure to sunlight. Rather than emphasizing crop-favorable positions, the panels now emphasize energy collection.

Unlike most other solar farms that continue to pursue the same goal throughout an entire year, this one does not. Its priorities shift with each passing season.

The calendar-driven agricultural cycle establishes one set of decision-making parameters. Following harvest, another set of decision-making parameters becomes applicable.

The same infrastructure serves different purposes during different seasons. Additional information about the project is available from Idemitsu.

Panel positioning changes with the agricultural cycle.

The same solar array follows two different sets of rules

After harvest, the solar array transitions from crop-shading positions to optimized non-growing-season positions that allow for maximum surface area exposure and utilize bifacial modules to capture reflected light.

The panels can be oriented toward positions that would be beneficial to energy production. They can be directed more aggressively toward favorable sun conditions. Prioritizing the capture of sunlight replaces prioritizing distribution of sunlight for crop development.

The land remains farmland. It is merely a matter of time before the next growing season commences and the rice will once again dictate panel positioning decisions. Until then, energy production becomes the primary objective.

The project operates in two different seasonal modes. Both occur on the very same land base.

For some portion of each year, the field below influences decisions made about panel positioning. Immediately after harvest, however, panel positioning responds primarily to where sunlight originates from.

The arrangement lasts until the next planting season, then the cycle starts anew, just like previous ones.