Introduction The valley of Dyfi deserves credit for its past efforts in environment conservation, especially in energy production. Recently, the County Council of Powy received an award for the best rural partnership under the “campaign of take-off for renewable energy” by the European Union, for renewable energy projects. One such project is a 112 KW grid-connected hydroelectric unit, installed by a local farmer in the area (Wilson 2004, p.112). Emphasis on environment conservation has set a basis upon which future projects for power generation are proposed. This paper is a feasibility report on a possible hydropower plant that will be located at Nant y Darren a tributary stream of Afon Dulas, in Pantperhog, Machynlleth, and boarders Powys and Gwynedd counties. It is an analysis of all the features required and the available resources, for its full implementation. Method Assumptions Site survey and research are the basis of this report. However, the values of efficiency have been estimated using standard projects of similar magnitude, to arrive at a production level of 250 kW. Theoretical kilowatts = (Head * Flow)/ 11.81 and an efficiency of 60%. There will be losses because of the distance to the nearest grid, which is 134 meters. This contributes to a loss of 300 kW according to Guide to Hydropower (2010). Another assumption is the costs of material for construction and is based on data available online, which is subject to change. The duration of the project depends on the immediate availability of funds and materials. Data on rainfall and water flow has been retrieved from the Centre of Ecology and Hydrology, which can be relied on. All the data is subject to errors since most has not been collected from the ground. This has been catered for by comparing information from different sources and the data used is the most consistent. Analysis of the Data and Justification Site Description Nant Y Darren is a tributary of Dyfi River and will be the stream, where the project will be located. The site location will be 52º 37’ N and 3º 51’ W. The stream flows from Northwest towards Southeast. The site is rocky and impermeable, with 60% being grassland and 30% being covered by forest (Moore 2007). The head will be 9.45 from the turbine location, which will be 199m downstream (Wheaton-Green 2006). The other details of the location are listed in the table below. Key characteristics            features                        Name of stream                 Nant Y Darren                   Stream Length                  3.2- 4.1 Km                     Terrain                        Pine forest                     Catchment area                 3 Sq Km                         Rainfall (approximately)       2300mm (from Wallingford-Hydra) Runoff (approximately)         1500 mm                         Annual mean flow (approx)      200m 3 /s                       Total Annual run-off (approx)  5 million m 3                    The circulated area (in red) represents the head while the blue region represents the position of the site. Topographical analysis The region has a lot by vegetation on Boulder clay, Silurian formations, and alluvium deposits (Wilson 2004). It rises 1900 feet above sea level according to Wilson (2004). The catchment area around the location is three sq Km, and the nearest