Based on the information you provided, it sounds like you have two potential options for implementing renewable energy in your home: hydropower and wind power. Here is a brief overview of each option, along with some potential wattages and return on investment:

Hydropower: Since you have a stream running next to your house, you may be able to generate electricity using a small hydropower turbine. These turbines are designed to capture the energy of flowing water and convert it into electricity. The amount of electricity you can generate will depend on the flow rate of the stream and the size of the turbine. A small turbine can generate anywhere from a few hundred watts to several kilowatts of electricity.
The return on investment for a hydropower turbine can vary depending on the initial cost of installation and the amount of electricity you can generate. However, it is worth noting that hydropower systems typically have a longer lifespan than other renewable energy systems, and may require less maintenance over time.

Wind power: Given that you have a high house that experiences a lot of wind, you may also want to consider installing a small wind turbine. These turbines work by capturing the kinetic energy of the wind and converting it into electricity. The amount of electricity you can generate will depend on the wind speed in your area, as well as the size and design of the turbine. A small turbine can generate anywhere from a few hundred watts to several kilowatts of electricity.
The return on investment for a wind turbine can also vary depending on the initial cost of installation and the amount of electricity you can generate. However, it is worth noting that wind turbines may require more maintenance over time than hydropower systems.

Ultimately, the best choice for your home will depend on a variety of factors, including the flow rate of the stream, the wind speed in your area, the cost of installation, and the amount of electricity you need to generate. It may be helpful to consult with a renewable energy expert who can assess your property and help you determine the best course of action.

As for potential wattages and return on investment, it is difficult to provide a precise estimate without more information. However, assuming you can generate several kilowatts of electricity with either hydropower or wind power, you could potentially save hundreds of dollars per year on your energy bills. Depending on the initial cost of installation, it may take several years to recoup your investment, but over time you could save thousands of dollars on energy costs.
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