Based on historical Johnston, RI data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Johnston.
Johnston has an average monthly Global Horizontal Irradiance (GHI) of 3.86 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 1% greater than the average monthly Direct Normal Irradiance (DNI) of 3.83 kWh/m2/day. 
Solar installations in Johnston that are always titled at the latitude of Johnston (Average Tilt at Latitude or ATaL) average 4.59 kWh/m2/day, or about 19% greater than the average monthly GHI of 3.86 kWh/m2/day and approximately 20% greater than the average monthly DNI of 3.83 kWh/m2/day. 
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 Johnston
Solar Radiation Data in Johnston, RI
See the chart below for monthly solar radiation levels in Johnston.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Solar Radiation Analysis for Johnston, RI
Johnston, RI has a average annual solar radiation value of 4.62 kilowatt hours per square meter per day (kWh/m2/day). 
The month with the highest historical solar radition values in Johnston is July with an average of 5.85 kWh/m2/day, followed by August at 5.76 kWh/m2/day and June at 5.56 kWh/m2/day. 
The three months that historically average the lowest average solar radiation levels in Johnston (Rhode Island) are December with an average of 2.81 kWh/m2/day, followed by November with an average of 3.27 kWh/m2/day and January at 3.33 kWh/m2/day. 
Solar Power Comparison: Johnston vs. the U.S.
Solar Power Levels in Johnston
The average monthly solar radiation level in Johnston, RI, of 4.62 kilowatt hours per square meter per day (kWh/m2/day) is approximately 24% greater than the average level of 3.73 kWh/m2/day in a city with historically low levels (WA) and is approximately 30% less than the average level of 6.6 kWh/m2/day in a city with historically high levels (NV). 
→ Values listed as 0 (zero) are not available (N/A).
Solar Power: vs. the U.S.
Below is a month-by-month comparison of how average Johnston solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). 
→ 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 town of Johnston, RI at this current time.
However, Johnston is in Providence County and Providence County has at least 202 solar insallations right now. 
Solar Power Output in Johnston
The Power of Solar in Johnston, RI
Monthly AC solar system output averages for Johnston (ri). Month-by-month solar power, as ranked by AC output, in Johnston. 
* Amounts listed in kWhac (kilowatt hours (AC))
Solar Output Analysis for Johnston, RI
Johnston (RI) has a average annual solar AC output value of 5453.89 kilowatt hours (AC). 
The month with the highest historical solar power output in Johnston is July with an average of 556.67 kWhac, followed by August at 550.13 kWhac and May at 529.17 kWhac. 
The three months that historically average the lowest average solar output levels in Johnston (Rhode Island) are December with an average of 297.13 kWhac, followed by November with an average of 327.12 kWhac and January at 356.64 kWhac. 
Cost of Utilities in Johnston
Johnston Electricity Costs
Electricity prices (residential) in Johnston averaged 22.32 cents per kilowatthour (¢/kWh) in September 2018, which was about 72% more than the overall U.S. average residential electricity rate of 13.01¢/kWh in September. 
Solar Power Poll: Johnston
Vote now: Given all of the data and analysis provided for Johnston, is solar power a good choice for residents of this town?
Johnston Natural Gas Costs
Natural gas prices (residential) in Rhode Island averaged $0.00 per thousand cubic feet (Mcf) in August 2018, which was approximately 100% less than the overall U.S. average residential natural gas rate of $17.32 per Mcf in August. 
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"Solar cells convert sunlight into electricity through a physical process known as the photovoltaic effect.",
"Nineteen-year-old Edmund Becquerel, a French experimental physicist, discovered the basis of solar energy in 1839.",
"Various missions to space by different countries are known to utilize solar energy as a main power source.",
"The largest solar power plant in the world covers 1000 acres & is located in the Mojave Desert in California.",
"Some tax incentives and rebate programs are designed to spur the use of solar energy. These vary by location.",
"Solar power is renewable, does not produce any pollutants and is one of the cleanest source of energy.",
"It takes light about 8 minutes, 19 seconds to travel the 93,000,000 miles from the sun's surface to us on Earth.",
"About half of the sun's energy is absorbed by the Earth's surface; about 30 percent is reflected back from the surface.",
"The solar energy that strikes the Earth in one hour could provide all of the Earth's energy needs for a complete year."
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