The month of September has the highest historical solar radition values in Promise City with an average of 6.1 kWh/m2/day. [More]
Solar Panels in Promise City
Solar panels in Promise City that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output. [More]
Sunrise & Sunset in Promise City
The total length of the day in Promise City, IA today (February 22, 2025) will be 11 hours and 3 minutes. [More]
Solar Power in Promise City, IA
Solar Energy Data in Promise City, IA
See the chart below to see how different types of solar panel installations compare in Promise City.
Based on historical Promise City, IA data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Promise City.[1]
Promise City has an average monthly Global Horizontal Irradiance (GHI) of 4.07 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 5% less than the average monthly Direct Normal Irradiance (DNI) of 4.29 kWh/m2/day. [1]
Solar installations in Promise City that are always titled at the latitude of Promise City (Average Tilt at Latitude or ATaL) average 4.75 kWh/m2/day, or about 17% greater than the average monthly GHI of 4.07 kWh/m2/day and approximately 11% greater than the average monthly DNI of 4.29 kWh/m2/day. [1]
Solar Energy Glossary
Global Horizontal Irradiance (GHI)
Global Horizontal Irradiance: The total amount of solar radiation that is received per unit area by a surface that is always positioned in a horizontal manner.
Direct Normal Irradiance (DNI)
Direct Normal Irradiance: The total amount of solar radiation received per unit area by a surface that is always perpendicular to the sun rays that come in a straight line from the direction of the sun at its current position in the sky.
Average Tilt at Latitude (ATaL)
Average Tilt at Latitude: The total amount of solar radiation received per unit area by a surface that is tilted toward the equator at an angle equal to the current latitude. ATaL will often produce the optimum energy output.
Solar Radiation Levels in Promise City
Solar Radiation Data in Promise City, IA
See the chart below for monthly solar radiation levels in Promise City.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Solar Radiation Analysis for Promise City, IA
Promise City, IA has a average annual solar radiation value of 4.99 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Promise City is September with an average of 6.1 kWh/m2/day, followed by July at 6.09 kWh/m2/day and August at 5.85 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Promise City (Iowa) are December with an average of 3.19 kWh/m2/day, followed by January with an average of 3.75 kWh/m2/day and November at 4.04 kWh/m2/day. [1]
Solar Power Comparison: Promise City vs. the U.S.
Solar Power Levels in Promise City
The average monthly solar radiation level in Promise City, IA, of 4.99 kilowatt hours per square meter per day (kWh/m2/day) is approximately 27% greater than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 25% less than the average level of 6.61 kWh/m2/day in a city with historically high levels (NV). [1]
→ Values listed as 0 (zero) are not available (N/A).
Solar Power: Promise City vs. the U.S.
Below is a month-by-month comparison of how average Promise City solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). [1]
→ k/m/d = kWh/m2/day = kilowatt hours per square meter per day.
→ Values listed as 0 (zero) are not available (N/A).
We do not currently have data on solar panel installations in the city of Promise City, IA at this current time.
Solar Power Output in Promise City
The Power of Solar in Promise City, IA
Monthly AC solar system output averages for Promise City (ia). Month-by-month solar power, as ranked by AC output, in Promise City. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Solar Output Analysis for Promise City, IA
Promise City (IA) has a average annual solar AC output value of 5709.1 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Promise City is September with an average of 558.43 kWhac, followed by July at 558.03 kWhac and August at 540.45 kWhac. [2]
The three months that historically average the lowest average solar output levels in Promise City (Iowa) are December with an average of 335.04 kWhac, followed by January with an average of 391.03 kWhac and November at 391.56 kWhac. [2]
Cost of Utilities in Promise City
Promise City Electricity Costs
Sorry, Promise City residential electricity prices are currently unavailable.
Please check back later.
Solar Power Poll: Promise City
Vote now: Given all of the data and analysis provided for Promise City, is solar power a good choice for residents of this city?
Promise City Natural Gas Costs
Sorry, Iowa residential natural gas prices are currently unavailable.
The city of Promise City, IA in Wayne County has an approximate population of 111. [6]
Promise City, IA Solar Energy
To learn more about solar energy and solar power Promise City, IA, or for more solar-related resources for Promise City, visit the U.S. Energy Information Administration.
Did you know?
Solar power is renewable, does not produce any pollutants and is one of the cleanest source of energy.
