1. Combustion:

* Process: Burning biomass directly in a furnace or boiler. The heat released from the burning process is used to generate steam or hot water, which can then be used to power turbines for electricity generation or for other purposes.

* Pros: Relatively simple technology, readily available biomass fuels, can be used in small-scale applications.

* Cons: Produces greenhouse gas emissions (although less than fossil fuels), can contribute to air pollution, requires large amounts of biomass.

2. Gasification:

* Process: Biomass is heated in a reactor with limited oxygen, converting it into a flammable gas called syngas. This syngas can then be burned directly, used in internal combustion engines, or converted into other fuels like methanol or ethanol.

* Pros: Higher energy efficiency than direct combustion, can utilize a wider range of biomass feedstocks, lower greenhouse gas emissions than combustion.

* Cons: More complex technology, requires significant upfront investment, can be less efficient than other renewable energy sources.

These are just two examples of how to release biomass energy. There are other methods, such as anaerobic digestion, which produces biogas from organic waste, or pyrolysis, which converts biomass into biochar and bio-oil. The most suitable method depends on the type of biomass available, the scale of the project, and the desired energy output.