Lorenzo Díaz, son-in-law of José Antonio Casimiro, uses a solar oven to cook food. In the background, a windmill and a solar heater are other technologies in the clean energy mix that the family has installed at their Finca del Medio farm in central Cuba. CREDIT: Jorge Luis Baños / IPS

By Luis Brizuela and Jorge Luis Baños
TAGUASCO, Cuba, Dec 12 2023 (IPS)

The combined use of clean energies allows Finca del Medio, a farm in central Cuba, to practice a unique system of family farming production that guarantees self-sufficiency based on permaculture, agroecology and care of the environment.

For three decades, 65-year-old farmer José Antonio Casimiro and his family have been applying innovations to take advantage of the solar, wind, hydraulic and biomass potential on their 13-hectare farm in the municipality of Taguasco in the central Cuban province of Sancti Spíritus.

Casimiro and his wife Mileidy Rodríguez, also 65, settled in 1993 with their children Leidy and José Antonio – Chavely was born a year later – on their paternal grandparents’ farm and began working to reverse the deterioration of the infrastructure and soil erosion.

The family, who live on the farm except for the eldest daughter, is currently self-sufficient in rice, beans, tubers, vegetables, milk, eggs, honey, meat, fish and fruit. Of the basic foodstuffs, they only have to buy sugar and salt, and the surplus they produce is sold in surrounding areas.

They also promote education and awareness-raising on good agricultural and environmental practices, on the social networks.

At Finca del Medio, a number of daily processes are supported by clean sources such as electricity generation, lighting, water supply, irrigation and water heating, as well as cooking, dehydration and drying of foods, and baking and refrigeration of food.

The farmer commented that the farm produces the equivalent of about 20 kilowatt hours (kWh) from a combination of multiple technologies and innovations that utilize the potential of clean energy sources.

If only conventional electricity were used for their activities, it would cost them around 10,000 pesos (83 dollars) per month, he said.

Their 28 solar panels, which produce about 8 kWh, increased the power for water collection, irrigation and supply, while three solar heaters ensure hot water for domestic needs such as bathing.

The hydraulic ram uses the water pressure itself as the only energy to extract it from a dam with a capacity of 55,000 cubic meters, pipe it to a tank at the highest part of the farm, and from there the slope is used for irrigation by gravity, or to fill the animals’ water troughs.

Next to the kitchen, two fixed-dome biodigesters provide biogas, obtained from the anaerobic decomposition of animal manure, crop waste and even household sewage.

Due to a decrease in the amount of manure, only one of the biodigesters is operating, which provides about seven meters of biogas per day, enough for cooking, baking and dehydrating food.

The innovative family devised a mechanism to extract – without emptying the pond of water or stopping biogas production – from the bottom the solids used as biofertilizers, as well as hundreds of liters of effluent for fertigation (a combination of organic fertilizers and water) of the crops, by gravity.

The installation of the biodigesters, the solar panels and one of the solar heaters was supported by the Swiss Agency for Development and Cooperation (Cosude) and the Indio Hatuey Experimental Station of Pastures and Forages through its Biomass-Cuba project, Casimiro said.

The agro-ecological innovator also highlighted the link with other scientific institutions such as the Integrated Center for Appropriate Technologies, in the central province of Camagüey, which is focused on offering solutions to the needs of water supply and environmental sanitation, and played an essential role in the installation of the hydraulic ram.

The family also has two windmills and an efficient stove that uses firewood, coconut shells and other waste to cook food, dehydrate fruits and spices, heat water and treat meats for preservation.

Casimiro is in favor of incorporating renewable energy sources into agricultural processes. But in his opinion, “More incentives, better policies and financial support are needed so that farming families have sufficient energy for their work and can improve the comfort of their homes and quality of life.”

Clean sources account for only five percent of electricity generation in this Caribbean archipelago of 11 million inhabitants.

The government considers it a matter of national security to modify the national energy mix, which is highly dependent on fossil fuel imports and hit by cyclical energy deficits.

By Luis Brizuela and Jorge Luis Baños
HAVANA, Jan 11 2023 (IPS)

Félix Morffi supports the energy needs of his home with the help of the sun, in some cases through handcrafted solutions that make the most of an alternative source that is abundant in Cuba, but still used very little.

With two tanks, glass, aluminum sheets, as well as cinderblocks, sand and cement, the 86-year-old retiree created, in 2006, a solar heater that meets his household needs.

“You build it today and tomorrow you have hot water; anyone can do it, and if they have a bit of advice, all the better,” said the retired mid-level machine and tool repair technician who lives in the municipality of Regla, one of the 15 that make up Havana.

He also designed and made a dryer that uses the heat of the sun to dehydrate fruits, spices and tubers, which he assembled mostly with recycled products such as pieces of wood, nylon, acrylic and aluminum sheets.

On the roof of his house, 16 solar panels imported in 2019 provide five kilowatts of power (kWp) and help run his small automotive repair shop where he works on vehicles for state-owned companies and private individuals, an independent enterprise that he set up next to his house.

The innovator believes that despite the economic conditions, with a little ingenuity people can take advantage of the natural elements, because “the sun shines for everyone; the wind is there and costs you nothing, but your wealth is in your brain”

In addition to covering his household needs, he provides the surplus electricity to the national grid, the National Electric Power System (SEN).

Morffi said more training is needed among personnel involved in several processes, and he cited delays of more than a year between the signing of the contract with Unión Eléctrica and the beginning of payments for the energy surpluses provided to the SEN, as well as “inconsistency with respect to the assembly” of the equipment.

Although Cuba has a national policy on renewable energy sources, “there is still a lot of ignorance and very little desire to do things, and do them well. Awareness-raising is needed,” he argued.

The innovator believes that despite the economic conditions, with a little ingenuity people can take advantage of the natural elements, because “the sun shines for everyone; the wind is there and costs you nothing, but your wealth is in your brain.”

In his backyard, a small solar panel keeps the water flowing from a well for his barnyard fowl and an artificial pond holding a variety of ornamental fish as well as tilapia for family consumption.

The construction of a small biodigester, about four cubic meters in size, is also at an advanced stage on his land, aimed at using methane gas from the decomposition of animal manure and crop waste, for cooking.

Morffi, who manages these activities with the backing of several family members, also plans to import three small wind turbines of 0.5 kWp each and a new batch of 4 kWp solar PV panels.

His vision is to turn his house into a space for the production and promotion of renewable energies in Cuba.

To this end, he has the support of the non-governmental Cuban Society for the Promotion of Renewable Energy Sources and Respect for the Environment (Cubasolar), of which Morffi has been a member since 2004.

Since 2014, Cuba has had a Policy for the Development of Renewable Energy Sources and their Efficient Use. And in 2019, Decree Law 345 established regulations to increase the share of renewables in electricity generation and steadily decrease the proportion represented by fossil fuels.

According to studies, this archipelago of more than 110,800 square kilometers with an annual average of 330 sunny days receives an average solar radiation of more than five kilowatts per square meter per day, considered to be a high level that provides enormous potential in terms of energy.

The solar energy program appears to be the most advanced and with the best opportunities for growth. Over the last decade, several solar parks have been built, providing more than 75 percent of the renewable energy produced locally.

But clean sources account for just five percent of the island’s electricity generation, an outlook that the authorities want to radically transform, setting an ambitious goal of 37 percent by 2030.