How to Setup Your Own Small-Scale Hydropower System

How to Setup Your Own Small-Scale Hydropower System

How to Setup Your Own Small-Scale Hydropower System


Setting up a small-scale hydropower system on your property can provide clean, renewable energy to power your home or business. With some planning and effort, you can harness the power of flowing water to generate electricity. In this guide, I will walk through the key steps and considerations for developing your own small-scale hydropower project from start to finish.

Assessing Your Hydropower Resource

The first step is to assess whether your site has the necessary water resources to support a hydropower system. Some key factors to consider:

  • Water flow rate – Measure the flow rate of the stream or creek in gallons/minute. A minimum flow of 500-1000 GPM is recommended.

  • Head height – The vertical drop or “head” that the water falls. At least 2-3 feet of head is ideal.

  • Consistency of flow – Choose a water source with relatively consistent year-round flow. Seasonal streams may not provide sufficient flow in drier months.

  • Water rights – Research whether you have legal rights to use the water source for hydropower. Obtain any necessary permits.

  • Proposed diversion – Determine how you will divert water from the stream to your powerhouse.

Conducting flow rate tests during both high and low water seasons will give you an accurate idea of the available hydropower resource.

Selecting a Hydropower System

If your site has sufficient water flow and head available, the next step is choosing a hydropower system sized for your resource. The main components include:

  • Turbine – Converts the energy of moving water into rotational energy. Common choices are Pelton wheel, Turgo wheel, Crossflow, and overshot water wheel turbines. Match turbine type to head height.

  • Generator – Converts the rotational energy into electrical energy. Permanent magnet alternators are common in small systems.

  • Controller – Regulates the electrical power output.

  • Inverter – Converts generator power into usable AC electricity to power your home/business.

Many manufacturers offer all-in-one systems to simplify selection. Choose a system rated for your measured head and flow availability.

Powerhouse and Intake Design

Next, you will need to design and construct the powerhouse and water intake:

  • The powerhouse houses the turbine, generator, and control equipment. Locate this near your existing electric service.

  • The intake diverts water from the stream into your pipeline leading to the turbine. Include a screen to filter debris.

  • Design and size the pipeline to minimize losses. Consult pipe sizing charts.

  • Factor in a bypass to return unused water to the stream for ecological balance.

Work with an engineer to design a powerhouse and intake optimized for your specific site conditions. Obtain necessary construction permits.

Installation and Wiring

Once project components and infrastructure are prepared, the next stage is installation and wiring:

  • Have a certified electrician connect the generator to your existing electric service panel and grid tie-in.

  • Install the turbine and generator equipment according to manufacturer specifications.

  • Connect the intake pipeline from water source to turbine. Include a valve to control water flow.

  • Set up the electronic load controller and inverter per directions.

  • Complete all electrical connections from generator to load control center.

Adhere to all electrical codes and safety standards when installing wiring and connections.

Testing and Commissioning

Before fully commissioning the system, perform thorough testing:

  • Test that the turbine spins properly once water flow is initiated.

  • Confirm the generator produces expected electrical output under controlled conditions.

  • Verify proper operation of the load controller, inverter, and electronics.

  • Inspect that all water connections and pipelines are watertight.

  • Check that the intake screen is filtering debris as intended.

  • Test automatic shutoffs and protection systems.

Address any issues discovered before proceeding to full operation.

Obtaining Net Metering Approval

If connecting your hydropower system to the electric grid for net metering, obtain approval from your utility company:

  • Submit your generating capacity and technical specifications.

  • Complete any interconnection agreements and inspections required.

  • Have proper net metering billing arranged by the utility.

  • Verify that your existing electric service can accommodate two-way flow.

Final approval is needed before the system can be interconnected.

Ongoing Operation and Maintenance

Once commissioned, implement regular maintenance procedures to keep your hydropower system running optimally:

  • Monitor water flow rate and head height. Adjust as needed.

  • Inspect intake screens and clear any debris buildup.

  • Check turbine and generator equipment for abnormal wear or noise.

  • Test and calibrate electronic controls and sensors.

  • Lubricate parts according to manufacturer specifications.

  • Inspect pipelines, powerhouse, and civil infrastructure annually.

  • Budget for repairs and equipment replacements over time.

With proper maintenance and operation, a small-scale hydropower system can provide clean renewable energy for decades.


Developing your own small-scale hydropower project takes research, planning, and preparation but can provide reliable renewable electricity. Keys steps include assessing your water resource, selecting optimal equipment, designing civil infrastructure, installing electrical components, obtaining grid approvals, testing the system thoroughly, and staying on top of maintenance. While not trivial, with patience and hard work, small-scale hydropower can be an incredibly rewarding way to harness the renewable power flowing through your backyard stream.