HES guarantees a minimum level of work for the generator sets in the plant, thus extending the useful life of the engine, during peak sunshine hours or when the wind turbines, which harness the power of the wind and convert kinetic energy into electrical energy, are at their most active. 

HES generator sets also have a built-in monitoring system to determine which is the best source of power at any given time of day, which makes generator sets and batteries a useful temporary solution that can quickly and efficiently adapt to your fluctuating energy needs. This is particularly important in the case of renewable energy, which can be subject to fluctuations in the availability of natural resources such as sunlight or wind. 

However, HES also rents out these power units as a cost-effective alternative solution for companies that would otherwise not be able to afford the high investment costs associated with the purchase of stationary generator sets. 

This is particularly beneficial for companies that want to implement new power systems and test how the different sources can be integrated before making a long-term investment, making rental costs a useful and economical alternative for companies in the renewable energy sector.