Biogas, a Solution to Poultry Pollution in El Salvador

By Edgardo Ayala
JAYAQUE, El Salvador, Jul 25 2025 – Still in its early stages and with few players, the poultry sector in El Salvador is taking small steps toward environmentally sustainable production by using its biological waste to generate biogas and, in turn, electricity –an equation that benefits the natural environment, communities, and the farms themselves.

El Granjero is the second-largest egg-producing company in the country, with over one million chickens distributed across its eight farms. After an investment of US$2.5 million, it created the subsidiary Renig to build a biogas plant in 2017.“I thought biodigesters were the most suitable because you solved the environmental problem right away, and the possibility of being profitable” –Bernhard Waase.

A year later, it began processing 200 000 tons of chicken manure and other organic waste annually.

This waste serves as the raw material for producing biogas, the fuel used to generate electricity, which the company then injects into the national power grid.

“Back around 2010 or 2012, we discussed what to do with all the chicken manure because the way it was being handled—by poultry farmers in the country and, I’d say, around the world—was that it was dumped in the open air,” Bernhard Waase, director of Renig, told IPS. The facility is located in La Labor, within the district of Jayaque, in the southwestern department of La Libertad.

At least five of El Granjero’s eight farms, which are dedicated exclusively to egg production, are situated in this rural settlement.

Bernhard Waase, director of Renig, a subsidiary of the Salvadoran company El Granjero, where chicken manure from eight farms is converted into biogas. Credit: Edgardo Ayala / IPS

An Environmentally Friendly Solution 

The environmental pollution caused by the poultry sector has been a source of tension for rural communities living near the farms that were established in their territories or expanded around them over time, as was the case with El Granjero, founded in 1968.

“When the company was established, there wasn’t a single house nearby; it was completely uninhabited,” Waase noted before showing IPS around the plant facilities. But the issue of environmental pollution remained.

“I thought biodigesters were the most suitable because they solved the environmental problem immediately, but there was also at least a possibility of being profitable,” said Waase, referring to the potential for generating electricity.

The country’s poultry sector produces approximately 1.2 billion eggs and 342 million pounds of chicken meat annually, according to data from the Salvadoran Poultry Association.

However, despite being crucial in food production for the country, its contribution to the gross domestic product (GDP) is low, at just 0.79%, though within the agricultural GDP, it accounts for 16%.

Few companies in the poultry sector have chosen to invest in environmentally friendly solutions for biological waste.

One of them is Grupo Campestre, one of the largest chicken producers, which invested seven million dollars to set up its biogas plant and process the 40,000 tons of biological waste generated annually by its farms, processing plant, and fried chicken restaurants owned by the consortium nationwide.

Laying hens at the San Jorge farm, one of eight owned by the egg producer El Granjero. The manure from these farms in southwestern El Salvador is used for biogas production. Credit: Edgardo Ayala / IPS

Biogas production in El Salvador is minimal compared to other renewable energy segments. In fact, its share is so small that it does not appear in the national energy matrix, which is dominated by hydropower (33.7%), geothermal (23%), and natural gas (16%).

Meanwhile, photovoltaics account for 8.5%, and wind power barely represents 2.1%.

In recent years, there has been notable interest in El Salvador, a country of six million people, in promoting clean, renewable energy production, which represents 70% of the country’s energy matrix, according to official figures.

The Renig executive stated that producing electricity from biogas is expensive and complex, as it not only requires investment in facilities and personnel but the process itself is extremely complicated.

“It’s costly because of the equipment and the operation of production. It’s not like solar—that’s child’s play: you have the land, you install the panels, you make the connections that any university student can do, and that’s it,” said Waase.

The complexity of biogas production also lies in dealing with bacteria, living organisms that can behave unpredictably and affect gas production, explained Melissa Ruiz, in charge of the digester and secondary processes.

Sometimes the bacteria get “sick,” she noted, and they must be carefully tended to.

“The digester works like our stomach, and the bacteria are very sensitive to the elements we provide them—just like us: if we suddenly eat too much meat or an unbalanced diet, our stomach reacts, and we feel sluggish or get sick. The same thing happens with the digester,” Ruiz told IPS.

The biogas produced by the Renig plant’s biodigester, using waste from a Salvadoran poultry company, powers two engines with a generation capacity of 425 kilowatts each. Credit: Edgardo Ayala / IPS

An Eco-Friendly Plant 

Once El Granjero decided to bet on biogas production through its subsidiary, it began working on the technical, operational, and financial details of what would become the Renig plant, where a biodigester measuring 92 meters long, 17 meters wide, and 5 meters deep—with a capacity of 5,300 cubic meters—would be built.

The biodigester is the centerpiece of any biogas plant. Inside, bacteria break down the biological waste from the farms—in El Granjero’s case, chicken manure.

This decomposition process generates gases, including methane, which become the fuel to power the plant’s two engines, each with a generation capacity of 425 kilowatts.

If not used for electricity production, these gases would rise into the atmosphere and contribute to global warming.

According to the United Nations Environment Programme (UNEP), methane is a potent greenhouse gas with a warming potential 80 times greater than carbon dioxide.

This gas is also the main contributor to ground-level ozone formation, a dangerous air pollutant whose exposure causes 1 million premature deaths worldwide each year.

The Renig plant’s biodigester began producing biogas in 2018, but it only started generating electricity in 2021, as that was the year it participated in a government tender for renewable energy production.

During the period when no electricity was generated, the biogas had to be “flared” to prevent the gases from escaping into the atmosphere, using a combustion torch the company had to purchase for US$40,000.

“This torch basically burned all the biogas, and I thought: I’m literally burning money. Since February 2021, this torch hasn’t been lit because I’ve been generating energy,” said Waase.

As part of its production processes, the Renig biogas plant also produces high-quality fertilizer, which it markets to the agricultural sector. Credit: Edgardo Ayala / IPS

The Business Moves Slowly but Surely 

Two years earlier, in 2019, Renig won the contract to inject 0.85 megawatts into the national grid—a modest amount but significant as a starting point.

For reference, the Nejapa biogas plant, built in 2011 and operated by AES El Salvador at a cost of US$58 million, has an installed capacity of six megawatts.

Waase stated that, environmentally, the plant has achieved its primary goal of preventing pollution, which is already a cause for celebration and pride, as few large companies in the poultry sector have taken this step. Specifically, in the egg industry, El Granjero is the only one that made this investment.

However, financially, expectations have not been fully met.

“From an environmental standpoint, it’s been a total success, but financially speaking, it’s much more complicated. We haven’t lost money in any year, but we’re nowhere near the return we had projected,” he said.