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Clear Sky Charts (called clocks until February 29, 2008) are web graphics which deliver weather forecasts designed specifically for astronomers. They forecast the cloud cover , transparency and astronomical seeing , parameters which are not forecast by civil or aviation forecasts. [ 1 ]
Pennsylvania has a renewable portfolio standard titled Alternative Energy Portfolio Standard (AEPS), which mandates use of solar photovoltaics (PV) for electricity. All electrical utilities in Pennsylvania must supply a percentage of their electricity from alternative sources, which fall into two tiers: Tier I, which includes biomass, wind, and geothermal; and Tier II, which includes waste ...
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PACE financing (property assessed clean energy financing) is a means used in the United States of America of financing energy efficiency upgrades, disaster resiliency improvements, water conservation measures, or renewable energy installations in existing or new construction of residential, commercial, and industrial property owners.
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The blue sky spectrum contains light at all visible wavelengths with a broad maximum around 450–485 nm, the wavelengths of the color blue. Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere.