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Mara wants the old mill house to stay lit when the road floods and the main line goes down . The building sits above a fast stream , under a long roof , with wind on the ridge . She has one afternoon with an engineer , and the neighbours will vote on whatever she brings back . They start with the roof . Photovoltaic cells turn sunlight straight into electricity . Panels can sit on a roof , in a field , or be built into the materials of a building , and this roof is wide and clear . On a bright day it could run the lights , the pump , and the workshop . Sunlight fails at night and thins under cloud , so something has to hold what the day makes . Lithium - ion batteries are a common way to store that electricity . They keep power . They do not make it . Wind comes next . A turbine takes moving air and turns it into electricity . A small machine on the ridge could work when the roof is grey . Large turbines on land and offshore feed a grid , not one house . A machine here would still stop when the air does . Wind and sun do not always fail together , and neither of them is a promise . Water is the part she already trusts . A run - of - river system uses the stream without a large dam or a reservoir . A long dry spell would leave little water to use . Pumped storage is another idea : spare electricity lifts water uphill , then the water returns through a turbine when demand rises . That needs height and a second basin , which this site does not have . Heat under the ground is real , and weather does not decide whether it is there . Wells can reach hot water or steam , and that heat can warm buildings directly , greenhouses included . It is especially useful where volcanic or tectonic ground brings the heat near the surface . This valley is quiet rock , so geothermal leaves the list . Biomass stays a side note . Wood , crop waste , and plants grown for fuel can be burned , turned into liquid fuel , or made into biogas . The mill has offcuts , not a supply . As a main source it would mean trucks of fuel , and the house would depend on the road again . By late afternoon the plan is smaller than the brochures . Panels on the roof , a battery in the old store room , and a modest turbine if a test shows useful air on the ridge . The stream can add a little when it runs . The power line stays . Mara writes that short list down , and the vote has one clear choice .
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