Latest News

Bangladesh tests solar panels on rice crops to provide food and power

Bangladesh tests whether crops can grow on solar panels

Land scarcity fuels dual push for food and energy

* The economics of agrivoltaic scaling up

Tahmid Zami Tahmid Zami

A nation of about?175 millions is dependent on imports to meet 95% of their?energy requirements. This dependence has been made worse by the rising costs due to the war in the Middle East. It is also looking at ways to diversify the energy supply, including more renewable energy.

Solar energy is the largest source of renewable power in Bangladesh. However, it only represents 4.5% of total generation capacity.

Solar panels can be installed either on roofs or on the ground. Roof space is limited, and ground systems take land that could otherwise be used for housing or farming.

Sohanur Rahman is the executive coordinator for YouthNet Global. A climate justice campaign group.

Researchers are looking into the new technology of "agrivoltaics", where crops and livestock share space with solar panels.

This year, the Bangladeshi development organization BRAC and the research organisation Institute of Governance and Development launched a project to install solar panels over farmland at Manikganj. The town is located about 50 kilometers (30 miles) from the capital Dhaka. The H&M Foundation is a non profit linked to the Swedish clothing company H&M.

RICE NEEDS THE SUN, BUT SHADE IS GOOD FOR WORKERS

Bangladesh has little land that is not agricultural for solar power.

Solar parks were previously proposed but scrapped because of concerns about land loss and livelihoods.

Solar panels at Manikganj are more than two metres above ground level, which allows varying amounts to sunlight to reach the crops below.

Researchers will measure rainfall, wind speeds and other microclimate information and compare yields with nearby controls plots in order to determine which panel height, spacing, and crop combinations balance food production and?generation.

For farm workers in Bangladesh, the average wage is $7 per day. This includes rice, coriander and other crops such as bottle gourds, onions, pumpkins, and bottle gourds.

Biswas, a farm worker, said that the shaded area helps to preserve soil moisture and also makes it more comfortable for the workers on hot summer days.

The Wave Foundation and the German Development Agency GIZ, which works on poverty and climate issues in Bangladesh and Germany, have conducted agrivoltaic trials in Manikganj.

In Chuadanga, agrivoltaic tests have also tested the rearing of goats and chickens.

Rohini Kamal, assistant professor at BIGD, explained that farmers in Bangladesh prefer to grow rice, the main staple of the country, and this requires lots of sunlight. The ongoing project focuses on finding ways to grow rice using solar panels.

He said that low-lying areas like Manikganj, which are often submerged by the monsoons, need rice varieties that can withstand flooding. The solar mounting structures must also be strong enough to withstand storms.

Will the sums add up?

The viability of agrivoltaics systems is dependent on several variables.

A pilot study conducted in Chuadanga, 2024, estimated that the revenue generated by both crops and electricity would reduce the payback time for the panels from five to six years to three to four years under favorable conditions.

Mehedi Bappy, agronomist and project manager at the Manikganj site, explained that lower, closely-spaced panels are less expensive to build but produce more shade. Higher, more widely-spaced structures are more expensive but are better for sun-loving plants like rice.

Bappy says that the rice yield looks good so far, but more data is needed from other crop cycles.

The project pays a daily wage to the workers, and the electricity produced is used to irrigate nearby farmland.

Kamal explained that once the project is connected to the national grid it will be possible to export the excess electricity generated. However, existing rules must change in order for farmers and operators to receive direct payment for the power produced by solar panels on their land.

Dipal Chandra Barua is the president of Bright Green Energy Foundation in Bangladesh, an NGO that installs renewable energy systems at small scales for rural communities.

Researchers are still waiting to see if the solar panels placed above the crops will deliver on their promise.

(source: Reuters)