Operating closely with NGT Frequency Service is the NGT Reserve Service. Participants include owners of small diesel (in the range 0.25-5MW) or open-cycle gas turbine generators (in the range of 25MW to 100MW) who are paid to start up and connect to the grid within 20 minutes at the same time as Frequency Service customers are called upon to disconnect. Participants must be reliable and able to stay connected and running for an hour or so. Substantial fees can be earned simply for making generating capacity available under complex contracts that specify levels of reliability, response times, frequency of use and so on.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.