The solar industry has seen rapid growth over the past decade, and a major contributing factor has been the surge in solar farms popping up across the globe. In this article, we’ll explain the different types of solar farms, how much they cost and how to start one.
What is a solar farm?
A solar farm, sometimes referred to as a photovoltaic power station, is typically a large decentralized solar array supplying electricity to the power grid. The majority of these massive arrays are owned by utilities and are merely another asset for the utility to supply power to properties in their coverage area.
A broader definition of solar farms could include other ground-mounted solar arrays large enough to supply power for many households. This general concept of a solar farm could be associated with both residential community solar and larger utility-scale solar.
Solar farms and community solar
The idea of community solar has taken off in recent years as more homeowners have realized that they can go solar without putting solar panels on their own physical roof. A community solar project—sometimes referred to as a “solar garden” or roofless solar —is a solar power plant whose electricity is shared by more than one household. In most cases, a community solar array is a large ground mount installation that spans one or many acres.
Visually, these solar gardens resemble utility-scale solar farms, but they are often smaller in size. Customers can either purchase a share of a solar garden and own that portion of the overall array or they can lease energy from the solar system and, in a sense, replace their monthly utility payments with monthly community solar payments that are typically at a lower price. You can find community solar projects in your town or state in our Community Solar Marketplace.
Wondering how community solar works? We’ve put together an infographic to explain how you can benefit from a shared solar farm:
Infographic: What is a community solar farm and how does it work?
How much do solar farms cost?
Solar farms at the utility scale will typically be at least 1 megawatt (MW), which is a power plant capable of supplying some 200 households. Though cost will range based on a number of factors like location and available sunlight hours, top commercial provider First Solar has stated that the cost per watt for solar installations at this scale is somewhere around $1/watt. Therefore, you can assume that a 1 MW solar farm would cost roughly $1 million to install.
If that value sounds unusually low in comparison to typical costs associated with residential solar ($3 to $4 dollars per watt), it should. The “economies of scale” concept is in full effect with the solar industry.
What is the largest solar farm in the world?
The largest solar system installed in the world is the Tengger Desert Solar Park, which went live in 2016 in China. The 1,447 MW array can supply energy to hundreds of thousands of households.
It should be clarified that these massive solar plants are more commonly referred to as “solar farms” than smaller ground mount arrays often see with community solar projects. Solar systems at the scale of the Tengger Desert Solar Park are the size of entire towns and thus take on the name “solar farm” to reference the size of the install (see above image). The term more commonly used with community solar is “solar gardens” due to the fact that the system could be only a few acres and could even live in someone’s backyard.
Rooftop solar vs. solar farms
Joining a community solar farm can be a great option if your roof isn’t right for solar or don’t want solar panels installed on your property. Even if your roof is good for solar, enrolling in a community solar project can still be worth it if the costs are low and the contract terms are beneficial. As community solar projects become more common and the contract terms become more consumer-friendly, solar farm options will compete even more with rooftop solar. However, each individual property has unique challenges and considerations, and there’s no easy way to determine if you’re the right candidate for joining a solar farm.
Check out our comparison of rooftop and community solar for a more in-depth look at how the two options stack up against one another.
Building a solar farm: how does it work?
When considering building a solar farm, whether it be a 50 kW array or a 50 MW project and larger, here are five key questions you should ask:
1. How many acres do I need for this size of a power plant?
A smaller solar farm may only require a few acres of land whereas a large utility-scale solar farm can require hundreds of acres (for reference, the above mentioned Kamuthi Power Plant spans 2,500 acres).
2. How will electrical connection work?
You’ll need to consider the location of the land and whether or not it’s situated close enough to power lines and electrical panels to feasibly connect your array to the power grid or to a centralized power source.
3. How will I clean and maintain the plant?
Whether or not the location has water sources or cleaning options will be important in order to maintain the efficiency of so many solar panels that are situated so close to the ground. The Kamuthi Power Plant, for example, is constantly cleaned by a team of solar-powered robots.
4. How many solar panels will I need?
In order to make sure you’ll be able to meet the expected energy demand with your solar farm, you’ll need to first start with the needed kilowatt hours of energy and work backward to get a number of panels you’ll need for the array. To calculate this figure, you’ll need to determine the solar panel production ratio for your area to understand how much energy a certain solar panel wattage will provide. Check out our full explanation on how to do this type of calculation.
5. What’s a good price for my solar installation?
For larger arrays, there will likely be significant discrepancies between quotes from various contractors, so it will be important to get a few bids from different companies. Solar Power World compiles a list of top solar developers each year that can be a helpful starting point.
If you’re in the early stages of considering a residential solar installation, rather than a solar farm, our Solar Calculator can offer a free estimate for what the array might cost, when you could break even on the investment and how much it could save you over time. For those interested in the community solar options in their state, check out our network of Community Solar Providers.
Three Tips for Solar Shoppers
1. Homeowners who get multiple quotes save 10% or more
As with any big ticket purchase, shopping for a solar panel installation takes a lot of research and consideration, including a thorough review of the companies in your area. A recent report by the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) recommended that consumers compare as many solar options as possible to avoid paying inflated prices offered by the large installers in the solar industry.
To find the smaller contractors that typically offer lower prices, you’ll need to use an installer network like EnergySage. You can receive free quotes from vetted installers local to you when you register your property on our Solar Marketplace – homeowners who get 3 or more quotes can expect to save $5,000 to $10,000 on their solar panel installation.
2. The biggest installers typically don’t offer the best price
The bigger isn’t always better mantra is one of the main reasons we strongly encourage homeowners to consider all of their solar options, not just the brands large enough to pay for the most advertising. A recent report by the U.S. government found that large installers are $2,000 to $5,000 more expensive than small solar companies. If you have offers from some of the big installers in solar, make sure you compare those bids with quotes from local installers to ensure you don’t overpay for solar.
3. Comparing all your equipment options is just as important
National-scale installers don’t just offer higher prices – they also tend to have fewer solar equipment options, which can have a significant impact on your system’s electricity production. By collecting a diverse array of solar bids, you can compare costs and savings based on the different equipment packages available to you.
There are multiple variables to consider when seeking out the best solar panels on the market. While certain panels will have higher efficiency ratings than others, investing in top-of-the-line solar equipment doesn’t always result in higher savings. The only way to find the “sweet spot” for your property is to evaluate quotes with varying equipment and financing offers.
For any homeowner in the early stage of shopping for solar that would just like a ballpark estimate for an installation, try our Solar Calculator that offers upfront cost and long-term savings estimates based on your location and roof type. For those looking to get quotes from local contractors today, check out our quote comparison platform.