Centralia, Illinois, located in the Northern Temperate Zone, presents a moderately favorable location for year-round solar energy generation, though with significant seasonal variations that potential solar installers should carefully consider.

Seasonal Solar Performance

The solar energy output at this location shows dramatic seasonal swings. Summer delivers the strongest performance at 6.58 kWh per day per kW of installed capacity, making it the peak season for solar generation. Spring follows as the second-best season with 5.39 kWh per day per kW, offering excellent solar conditions as daylight hours increase and weather improves. Autumn sees a notable decline to 3.95 kWh per day per kW as the sun angle decreases and weather patterns change. Winter presents the most challenging conditions with only 2.39 kWh per day per kW, representing less than 40% of summer production levels. For maximum year-round energy production from a fixed panel installation at this location, solar panels should be tilted at 33 degrees facing south. This optimal angle balances the varying sun positions throughout the year to maximize total annual electricity generation.

Local Factors Affecting Solar Production

Several environmental and weather factors in the Centralia area can significantly impact solar energy production and should be addressed during installation planning. **Severe Weather Considerations** Illinois experiences frequent severe thunderstorms, particularly during spring and summer months when solar production is at its peak. These storms can bring damaging hail, high winds, and heavy rainfall that may reduce panel efficiency or cause physical damage. Additionally, the region sits within "Tornado Alley," where severe wind events pose risks to solar installations. **Seasonal Weather Patterns** Winter months bring snow accumulation that can completely block solar panels, dramatically reducing their effectiveness during an already low-production season. Ice formation can create similar problems and may also pose safety hazards for maintenance. The area also experiences significant humidity levels during summer months, which can reduce solar panel efficiency and create maintenance challenges. **Air Quality and Atmospheric Conditions** Central Illinois agricultural activities generate dust and particulates that can accumulate on solar panels, reducing their efficiency over time. The region's position in the Midwest also means it occasionally receives air pollution from industrial areas upwind, which can create atmospheric haze that reduces solar irradiance.

Preventative Installation Measures

Several installation strategies can help maximize solar energy production despite these local challenges:

• Enhanced structural support: Use reinforced mounting systems designed to withstand high winds and potential tornado conditions, with proper engineering calculations for local wind loads
• Impact-resistant panels: Select solar panels rated for hail resistance and severe weather conditions commonly experienced in Illinois
• Optimal panel spacing: Design installations with adequate spacing to allow snow to slide off naturally and provide access for snow removal when necessary
• Regular maintenance scheduling: Implement routine cleaning protocols to remove dust, agricultural debris, and other accumulations that reduce panel efficiency
• Proper drainage design: Ensure installation areas have adequate drainage to prevent water pooling and ice formation around panel foundations

The seasonal variation in solar output at Centralia means that while the location can generate substantial solar energy during peak months, winter production will be quite limited. Property owners should plan accordingly for energy storage or grid-tied systems that can accommodate these significant seasonal fluctuations in solar electricity generation.

Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 4253 locations across the United States. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in the United States by location

Solar output per kW of installed solar PV by season in Centralia, Illinois

Seasonal solar PV output for Latitude: 38.5273, Longitude: -89.1356 (Centralia, Illinois, United States), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:

 

Ideally tilt fixed solar panels 33° South in Centralia, Illinois, United States

To maximize your solar PV system's energy output in Centralia, Illinois, United States (Lat/Long 38.5273, -89.1356) throughout the year, you should tilt your panels at an angle of 33° South for fixed panel installations.

As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.

We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.

Seasonally adjusted solar panel tilt angles for Centralia, Illinois, United States

If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Centralia, Illinois, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 33° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
22° South in Summer	43° South in Autumn	53° South in Winter	31° South in Spring

Our recommendations take into account more than just latitude and Earth's position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA's Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.

This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.

Calculate solar panel row spacing in Centralia, Illinois, United States

We've added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Centralia, Illinois, United States.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. Minimum Spacing:
   We add the shadow length to the horizontal space occupied by tilted panels.

This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.

Topography for solar PV around Centralia, Illinois, United States

Topography and Terrain

Centralia, Illinois sits in the heart of the American Midwest within a region characterized by gently rolling prairie landscape. The surrounding terrain consists primarily of agricultural farmland with modest elevation changes that rarely exceed 100 feet across several miles. This area represents part of the Till Plains physiographic region, where ancient glacial activity left behind fertile soils and relatively flat topography ideal for both farming and large-scale development projects.

The immediate vicinity around Centralia features a mix of cultivated fields, pastureland, and small woodlots typical of southern Illinois. Creek valleys and drainage ways create subtle undulations in the otherwise level terrain, with most slopes remaining gentle enough to pose minimal challenges for construction or land development. The underlying geology consists of sedimentary bedrock covered by glacial deposits, providing stable foundation conditions throughout the region.

Optimal Areas for Solar Development

The expansive agricultural lands surrounding Centralia present excellent opportunities for large-scale solar photovoltaic installations. Open farmland stretching for miles in all directions offers unobstructed southern exposure with minimal shading concerns from trees or structures. These cleared areas eliminate the need for extensive site preparation while providing the substantial acreage required for utility-scale solar projects.

Areas to the west and southwest of Centralia appear particularly well-suited for solar development due to their combination of flat terrain, minimal tree cover, and existing agricultural use. The gently sloping fields in these directions provide natural drainage while maintaining optimal angles for solar panel placement. Additionally, the proximity to existing electrical transmission infrastructure along major transportation corridors enhances the feasibility of connecting large solar installations to the regional power grid.

The relatively sparse population density in the rural areas surrounding Centralia means fewer conflicts with residential development and reduced concerns about visual impacts from solar installations. Former strip mining areas that have been reclaimed also present unique opportunities, as these sites often feature large cleared areas with established access roads and minimal competing land uses.

United States solar PV Stats as a country

United States ranks 2nd in the world for cumulative solar PV capacity, with 95,209 total MW's of solar PV installed. This means that 3.40% of United States's total energy as a country comes from solar PV (that's 26th in the world). Each year United States is generating 289 Watts from solar PV per capita (United States ranks 15th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in United States?

Yes, there are several incentives for businesses wanting to install solar energy in the United States. These include federal tax credits, state and local rebates, net metering policies, and renewable energy certificates (RECs). Additionally, many states have enacted legislation that requires utilities to purchase a certain amount of electricity from renewable sources such as solar.

Do you have more up to date information than this on incentives towards solar PV projects in United States? Please reach out to us and help us keep this information current. Thanks!

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Compare this location to others worldwide for solar PV potential

The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.

However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.

Helping you assess viability of solar PV for your site

Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide

Enhance your solar panel's performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.