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Frequently Asked Questions
Solar Power
Solar power converts sunlight into electricity using photovoltaic (PV) panels made of semiconductor materials that release electrons when exposed to light.
Yes. PV panels generate electricity from daylight, not just direct sunlight, though efficiency increases with stronger sunlight.
A system includes solar panels, an inverter, batteries (optional), a charge controller, a mounting structure, cables, earthing protection, and a monitoring system.
On-grid: Connected to the national grid; excess power is exported.
Off-grid: Works independently with batteries.
Hybrid: Combines both, storing power while also connecting to the grid.
Off-grid: Works independently with batteries.
Hybrid: Combines both, storing power while also connecting to the grid.
Savings can reach up to 60–70%, depending on system size, sunlight hours, and consumption.
The three main types are monocrystalline, polycrystalline, and thin film, offering different levels of efficiency, cost, and durability.
Most high-quality panels last 25–30 years, with efficiency gradually reducing over time.
Net metering allows users to sell excess electricity back to the national grid, reducing energy bills and maximizing returns.
According to the Net Metering Guideline 2025, only three-phase consumers with a sanctioned load over 7 kW can apply, mainly commercial or large residential users.
Key frameworks include the Renewable Energy Policy 2025, the Electricity Act 2020, and the National Solar Energy Roadmap 2021–2041.
Micro-Wind
When the wind blows, it spins the rotor blades connected to a generator, converting kinetic energy into electrical energy.
Micro wind systems usually require an average annual wind speed of 4–5 m/s or higher for optimal output.
• Horizontal-Axis (HAWT): Common, efficient, needs steady wind direction.
• Vertical-Axis (VAWT): Works in variable wind, quieter, easier to maintain.
• Vertical-Axis (VAWT): Works in variable wind, quieter, easier to maintain.
With proper maintenance, a good-quality turbine lasts 20–25 years.
Capacity is measured in kilowatts (kW); a 5-kW system can power small homes or offices, depending on wind speed.
Wind speed, turbulence, tower height, blade design, and surrounding obstacles all influence output.
Typically, 10–30 meters above ground to avoid turbulence and capture stronger, more stable winds.
It combines wind turbines and solar panels to ensure power generation day and night and in varying weather conditions.
Yes, through on-grid configurations using inverters and bi-directional net meters approved by utilities.
Typical system efficiency ranges between 25% and 40%, depending on wind conditions and turbine design.
Biomass to Electricity
Common feedstock includes sustainably harvested wood, agricultural residues, plant-based materials, manure, and certain organic household waste.
The moisture content of the processed biomass fuel is typically the greatest factor impacting the energy density of the fuel.
Unlike intermittent renewable sources like solar or wind, biomass systems require a constant fuel to be supplied for continuous operation.
Biomass is the solid organic material itself, often used for direct combustion. Biogas is a gaseous fuel produced from the anaerobic (oxygen-free) decomposition of organic matter, such as manure or food waste.
Yes, biomass can be processed to create biofuels, such as ethanol and biodiesel, used primarily in transportation.
Co-firing is the process of burning biomass alongside a traditional fossil fuel, typically coal, in existing power plants to reduce net greenhouse gas emissions.
Yes, using the organic portion of household waste as a biomass fuel is a practice that promotes a circular economy by diverting waste from landfills and recovering energy.
No, while wood and plant-based materials are typical, manure and household waste can also be burned to produce energy.
Biomass is a dispatchable energy source, meaning it can be stored and used to generate power on demand, unlike solar or wind, which are intermittent.
Rice husk, jute sticks, sugarcane bagasse, sawdust, and crop residues are commonly used biomass fuels.
Biogas to Electricity
Yes. Since methane is the main component of both, biogas can be purified (scrubbed) into Renewable Natural Gas (RNG), which is interchangeable with fossil natural gas in existing pipeline infrastructure and appliances.
Animal manure, food waste, and sewage sludge are excellent feedstocks. Materials like wood and leaves are less effective as they are fiber-rich and difficult for the bacteria to digest.
Small-sized Biogas plants (1–25 m³) can usually be constructed and made functional within a duration of 1-2 months.
A typical 1 m³ daily capacity plant might require around 25 kg of cattle dung mixed with an equal volume of water daily.
Household plants handle small volumes of waste for cooking or heating, while industrial systems process larger quantities for electricity generation or commercial fuel.
Animal manure, kitchen waste, food scraps, and sewage sludge are the primary feedstocks rich in organic matter for gas generation.
Yes. Kitchen and food waste decompose easily and produce a high yield of methane-rich gas, making them ideal for biogas systems.
Regular inspection for leaks, cleaning sediment buildup, maintaining consistent feeding, and checking pressure valves are the key maintenance tasks.
A single cow can produce around 0.3–0.5 cubic meters of biogas daily, enough to cook meals for a small family.
Proper ventilation, flame arrestors, gas-tight piping, and corrosion-resistant materials prevent leaks and ensure safety.
Battery Energy Storage Systems (BESS)
A BESS includes a dedicated Fire Suppression System (e.g., clean agent systems for lithium-ion) for fire detection and suppression.
The investment is substantial, with a large-scale 10 MWh system in a country like Bangladesh potentially costing $2.5 to $5 million.
The cost includes the site preparation, the cost of the batteries and inverters, and all necessary grid integration equipment.
Yes, BESS can be used as a backup solution in the event of power outages or blackouts, often through an Uninterruptible Power Supply (UPS) interface.
The government is actively promoting BESS investment through incentives, partnerships with development organizations, and initiatives like private sector participation under build-own-operate models.
Lithium-ion batteries are the most deployed form of energy storage technology today due to their high energy density and decreasing costs.
Yes, BESS can be part of a hybrid system and often includes an interface for connecting and coordinating with a Backup Generator.
Lithium-ion is most common, followed by flow, sodium-ion, and lead-acid batteries for specific applications.
Depending on capacity, a BESS can supply power for 1 to 8 hours or more during grid failures.
They store excess generation during peak times and discharge energy when renewable output drops.