La Grande, Oregon, located in the Northern Temperate Zone, presents a mixed picture for year-round solar energy generation. This location experiences significant seasonal variation in solar output, making it moderately suitable for solar PV installations with some important considerations.

Seasonal Solar Performance

The solar energy production at La Grande varies dramatically throughout the year. Summer delivers the strongest performance at 7.80 kWh per day per kW of installed capacity, making it an excellent time for solar generation. Spring also performs well with 6.30 kWh per day per kW, providing substantial energy output during this season. However, the location faces challenges during colder months. Autumn production drops to 3.37 kWh per day per kW, while winter presents the most significant challenge with only 1.59 kWh per day per kW of output. This represents a five-fold difference between peak summer and winter production.

Optimal Installation Setup

For maximum year-round energy production at La Grande, solar panels should be installed at a fixed tilt angle of 38 degrees facing south. This angle is calculated to optimize total annual output by accounting for the sun's changing position throughout the year and weighting for daily solar potential.

Local Factors Affecting Solar Production

Several environmental and weather factors in La Grande can significantly impact solar energy generation:

• Snow accumulation during winter months can completely block solar panels
• Frequent cloud cover and precipitation, particularly in winter and spring
• Potential for ice formation on panels during cold periods
• Dust and debris accumulation from agricultural activities in the region

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies can help:

• Install panels at steeper angles (like the recommended 38 degrees) to encourage snow shedding
• Use anti-reflective coatings and hydrophobic treatments to reduce ice buildup
• Implement regular cleaning schedules, especially during dusty agricultural seasons
• Consider ground-mounted systems that allow easier access for snow removal
• Install micro-inverters or power optimizers to minimize impact when individual panels are partially shaded or covered

While La Grande's winter solar production is quite low, the strong summer and spring performance can still make solar installations worthwhile, especially when combined with proper installation techniques and maintenance practices to address local environmental challenges.

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 La Grande

Seasonal solar PV output for Latitude: 45.3332, Longitude: -118.0854 (La Grande, 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 La Grande, United States

To maximize your solar PV system's energy output in La Grande, United States (Lat/Long 45.3332, -118.0854) 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 La Grande, 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 La Grande, 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
29° South in Summer	48° South in Autumn	60° South in Winter	37° 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 La Grande, 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 La Grande, 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 La Grande, United States

Topographic Features of La Grande Region

La Grande sits in the Grande Ronde Valley of northeastern Oregon, positioned at an elevation of approximately 2,800 feet above sea level. The city lies within a broad, relatively flat valley floor that is surrounded by rolling hills and mountainous terrain. This valley represents part of the Blue Mountains region, which creates a distinctive bowl-like geographic setting with the Wallowa Mountains visible to the northeast and the Elkhorn Mountains to the southwest.

The immediate area around La Grande features gently sloping terrain with gradual elevation changes, making it well-suited for development and infrastructure projects. The Grande Ronde River meanders through the valley, creating some minor topographic variations, but the overall landscape remains relatively level across much of the valley floor. Agricultural lands dominate the flatter portions of the valley, indicating the favorable topographic conditions for large-scale development.

Moving outward from the central valley, the terrain becomes progressively more mountainous. The surrounding hills and ridges create natural boundaries for the valley while also influencing local weather patterns and wind flows. These elevated areas feature steeper slopes and more rugged terrain, with forested mountainsides rising dramatically from the valley edges.

Optimal Areas for Large-Scale Solar Development

The Grande Ronde Valley floor presents the most promising opportunities for large-scale solar photovoltaic installations. The expansive flat to gently rolling terrain provides ideal conditions for solar array placement, minimizing grading requirements and construction complexity. These areas offer excellent accessibility for equipment transportation and maintenance operations while providing sufficient space for utility-scale developments.

South-facing slopes on the lower hills surrounding the valley represent another attractive option for solar development. These elevated positions can offer advantages in terms of solar exposure while still maintaining reasonable access for construction and ongoing operations. The moderate slopes of these foothill areas provide natural south-facing orientations that can enhance energy capture throughout the day.

Agricultural lands within the valley floor deserve particular consideration, as many of these areas feature minimal existing development and established road access. The flat topography of these agricultural zones eliminates many of the technical challenges associated with solar installation on irregular terrain. Additionally, the existing agricultural use suggests that the land has suitable soil conditions and drainage characteristics for supporting large infrastructure projects.

Areas to avoid for large-scale solar development include the steeper mountainous terrain surrounding the valley, where slope angles would create significant engineering challenges and increase project costs substantially. The heavily forested areas on the mountain slopes would require extensive clearing and present environmental considerations that could complicate permitting processes. Similarly, areas with significant elevation changes or irregular topography would increase both construction complexity and ongoing maintenance requirements.

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.