Solar Energy Potential in Kelso, Washington

Kelso, Washington, United States, located in the Northern Temperate Zone, offers varying potential for solar energy generation throughout the year. The seasonal output from solar photovoltaic (PV) systems shows significant fluctuation, which is important to understand when considering solar installation in this area. The solar production in Kelso follows a predictable seasonal pattern. Summer stands out as the most productive season, generating an impressive 6.76 kWh per day for each kilowatt of installed solar capacity. Spring follows as the second most productive season with 5.19 kWh/day. These two seasons together represent the prime solar harvesting period in Kelso. In contrast, autumn yields considerably less energy at 2.69 kWh/day, while winter production drops dramatically to just 1.26 kWh/day per installed kilowatt. This winter output is approximately one-fifth of what can be generated during summer months.

Optimal Panel Installation

For residents of Kelso considering a fixed solar panel installation, the ideal tilt angle to maximize year-round energy production is 38 degrees facing South. This specific angle has been calculated to optimize solar collection across all seasons, taking into account Kelso's northern latitude and the varying solar elevation throughout the year.

Environmental and Weather Considerations

Several significant environmental factors can impact solar production in Kelso:

• Frequent cloud cover and precipitation, particularly during the Pacific Northwest's rainy season from late autumn through winter, substantially reduces solar efficiency during these months.
• Potential wildfire smoke during late summer months can temporarily diminish solar output by blocking sunlight.
• Winter snowfall, though typically not extreme, may occasionally accumulate on panels and require clearing.

To mitigate these challenges, several preventative measures are recommended:

• Install panels with a sufficient tilt angle (the recommended 38 degrees) to facilitate natural snow shedding and rain washing.
• Consider premium anti-soiling glass coatings that help panels shed dust, pollen, and light snow more effectively.
• Implement a regular maintenance schedule, especially before winter and after pollen season in spring.
• For larger installations, automated cleaning systems or snow removal tools may prove cost-effective in the long run.

Despite these seasonal challenges, Kelso's strong summer and spring production can make solar energy viable, particularly for systems designed with these seasonal variations in mind.

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 Kelso

Seasonal solar PV output for Latitude: 46.1468, Longitude: -122.9084 (Kelso, 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 38° South in Kelso, United States

To maximize your solar PV system's energy output in Kelso, United States (Lat/Long 46.1468, -122.9084) throughout the year, you should tilt your panels at an angle of 38° 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 Kelso, 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 Kelso, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 38° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
30° South in Summer	48° South in Autumn	60° South in Winter	38° 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 Kelso, 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 Kelso, 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 Kelso, United States

The topography around Kelso, Washington presents a diverse landscape shaped by volcanic activity, river systems, and glacial processes. Situated in southwestern Washington state, Kelso lies within the Cowlitz River valley, a significant tributary of the Columbia River. The city itself sits at a relatively low elevation of approximately 20-30 feet above sea level on predominantly flat terrain. Dominating the eastern horizon is the imposing Mount St. Helens, standing at 8,366 feet (though reduced from its pre-1980 eruption height). This stratovolcano is part of the Cascade Range and dramatically influences the surrounding topography. The 1980 eruption significantly altered the landscape, creating new landforms and depositing volcanic material throughout the region.

Surrounding Terrain Features

To the west of Kelso, the terrain gradually rises into the Willapa Hills, a series of modest mountains reaching elevations of 1,000 to 3,000 feet. These hills are characterized by rounded summits and steep slopes, heavily forested with coniferous trees typical of the Pacific Northwest. The Cowlitz River flows through Kelso, creating a flat floodplain that has been extensively developed for agricultural and urban use. This river valley represents some of the flattest terrain in the region, contrasting sharply with the surrounding hills and mountains. East of Kelso, beyond Mount St. Helens, the landscape transitions into the higher elevations of the Cascade Range, with numerous peaks, valleys, and volcanic features. The terrain becomes increasingly rugged and less accessible in this direction.

Potential Solar PV Development Areas

For large-scale solar photovoltaic development, several areas near Kelso offer promising conditions: The Cowlitz River valley contains extensive flat agricultural lands that could be repurposed for solar development. These areas benefit from minimal shading issues and existing road infrastructure. Particularly promising are the agricultural fields south of Kelso toward Castle Rock, which feature large, contiguous flat parcels. Certain south-facing slopes in the foothills west of Kelso may also be suitable for solar development. These elevated positions can reduce fog exposure compared to valley locations. The transitional zones between the valley floor and the Willapa Hills contain several gently sloping areas with favorable solar exposure. Former industrial sites around Longview-Kelso present another opportunity. These brownfield locations often feature large, flat areas with existing grid connections and minimal natural habitat concerns.

Topographical Challenges

The region's topography does present certain challenges for solar development. The surrounding hills and mountains can create shading issues, particularly during winter months when the sun angle is lower. The steep terrain of the Cascade foothills to the east limits development potential despite good solar exposure on south-facing slopes. Floodplain areas along the Cowlitz River, while flat and accessible, may face periodic flooding risks that could complicate solar installation. Additionally, the region's volcanic history means certain areas contain pumice soils or uneven deposits that might require additional site preparation. The mountainous areas surrounding Mount St. Helens, while receiving good solar exposure at higher elevations, present significant development challenges due to their rugged terrain, limited access, and protected status within the Mount St. Helens National Volcanic Monument. Overall, the most promising areas for large-scale solar development near Kelso would be the flat agricultural lands in the Cowlitz Valley, particularly those south of the city, and potentially some of the more gently sloping foothills to the west that face southward.

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.