Amid rising gas load-shedding, biogas bags are emerging as an alternative energy solution that converts kitchen waste into usable cooking fuel, offering partial relief to households facing energy shortages.
In Karachi, businessman Muhammad Uzair has installed a 2-cubic-meter biogas bag at his home, costing around Rs135,000.
According to him, the system has been in use for about one and a half years and produces gas for nearly one to two hours daily, significantly reducing dependence on natural gas during load-shedding periods.
The system works by feeding daily kitchen waste into the biogas bag, where it undergoes a natural chemical process that produces methane gas.
The gas is then filtered to remove odor and supplied to the kitchen through pipelines for domestic use.
An additional benefit of the system is the production of organic fertilizer. Depending on the amount of waste used, it can generate around 30 to 40 liters of fertilizer per week, which is useful for gardening and agricultural purposes.
Experts note that biogas contains methane, which is highly flammable. However, modern domestic biogas bags are designed with safety mechanisms to minimize leakage risks.
Any excess gas is automatically released and dissolved in water through a controlled system.
Energy specialists say biogas bags are an eco-friendly alternative energy source, but cannot fully replace conventional gas supplies in most households.
They are more suitable for partial energy needs and small-scale domestic use.
Despite limitations, interest in biogas technology is growing in Pakistan as households look for cost-effective and sustainable energy solutions.
However, challenges such as installation cost, space requirements, and maintenance continue to limit widespread adoption.
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