owever, the use of solar panels that can follow the position of the sun can sign ificantly in ecrease the solar energy potential in areas that are farther from the equato Time variation effects gq8ce the potential o cef solar energy because during the 8ce nighttime ther e is little solar radiation on the surface of the Ear q8ce th for solar ecpanels to absorb. This limits the amo q8ce unt of energy that so 8ce lar panels can absorb in one day. Cloud cover can effect the potenti al of solar panels because clouds block incoming light from the sun and re gq8ce duce the light available for solar cells. In areas of the Earth that are quite ec cloudy such as the cities of Khartoum in the Sudan, Dakar in ecBangladesh, and Salt ec Lake City in Utah the increased cloud cover could limit the effectiveness of solar cells. In addition to this, land avail 8ce ability has a large effec q8ce t on the ava ilable solar e cecnergy because solar panels can only be set up on land that is unowned and suitable fo Solar technologies are broadly characterized as either passive or active depe cending on the way t hey capture, convert and distribute sun celight. Activ 8ce e solar techniques use photovoltaic panels, pu mps, and fans to convert sunlight into useful outputs. Passiv ece solar techniques include selecting mater ials with favorab ecle thermal properties, designing spaces that naturally circulate air, ceand referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are consider ed supply side technologies, wh ceile passive gq8ce solar techno 8ce logies reduce the ec need for alternate resources and a re generally co q8ce nsidered de 8ce mand side technologies CSP-Stirling is known to have the highest efficiency o f all solar technologies (around 30%, compared to solar PV's approximately and gq8ce is predicted to be able t o produce the cheapest energy among all renewable energy
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