In this post, we will review the solar power plant cost per acre and solar power plant cost for home. A solar plant, 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. So what is the Solar Power Plant Cost?
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 plant 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?
Solar Power Plant 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 plant in the world?
The largest solar system installed in the world is the Pavagada Solar Park, which was fully completed in 2019 in India. The 2,050 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 Pavagada 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.
HOW TO BUY SOLAR PANELS
Are you thinking about buying a solar panel system but don’t know where to start? You came to the right place!A Really Great Read
Before we dive in to the specifics of solar panels (a.k.a. PV modules, solar electric panels), let us remind you that energy efficiency and conservation are the best ways to reduce your energy foot print and your electrical bill (see our Energy Efficiency and Your Home article). Please actively explore and incorporate all avenues of efficiency before pursuing a home solar panel system. That being said, solar power is an exciting clean-energy option that is becoming more and more popular. Solar electricity is a fascinating topic. To really feed your curiosity, we highly recommend the book PHOTOVOLTAICS: DESIGN & INSTALL MANUAL.
What shapes, sizes and types do solar panels come in?
Solar panels vary in length and width and are often about 2 inches thick. They are generally about 30 pounds or less, but the larger solar panels can be cumbersome to carry onto the roof. We carry a wide selection of solar panels for home use: framed, foldable, and rollable.
- Framed solar panels are the industry standards. They are the most cost effective and applicable for most home solar panels applications.
- Foldable solar panels are lightweight (less than 5 pounds) and can fold up and fit easily in a backpack.
- Flexible (or rollable) solar panels are also lightweight but bulkier than the foldable panels. Many people use these rollable solar panels on boats because they are durable and can be easily stowed after use.
Generally thin-film laminate type of solar panels (foldable & flexible) are more expensive per watt and require more square footage to produce the same wattage of an equally sized framed module.
What size solar panels do I need for my home and how many?
The number of solar panels you will need depends primarily upon the amount of electricity you are trying to produce and the insolation in your area. Solar insolation can be thought of as the number of hours in the day that the solar panel will produce its rated output. This is not equivalent to the number of daylight hours. Read more about insolation in our How To section and get an idea of the insolation in your area: Solar Insolation Map – USA.
You’ll find solar panels in a variety of wattages. Watts are the main measure of a solar panel, along with nominal voltage. For a rough idea of how many watts of solar panels you will need for your home, start by dividing your electrical usage (in watt-hours per day) by the solar insolation in your area. Bump that number up by 30-50% (to cover system inefficiencies) and you’ll have an idea of the number of watts of solar panels total you will need. If that number is more than 1000 watts, you are talking about $4K to $8K or more for the solar electric system. (Could we take this opportunity to mention the importance of energy efficiency again?!) If you could still use a little help with the math, please give us a call and tell us how much electricity you are trying to produce (in kwh/month or watt-hours/ day) and your location, and we’ll help get you started.
What types of solar panels are there?
Most solar panels can be classified as monocrystalline, polycrystalline or amorphous. This is based on the silicon structure that comprises the cell. It’s not quite as complicated as it sounds. Basically a 100 watt monocrystalline solar panel should have the same output as a 100 watt polycrystalline solar panel and a 100 watt amorphous solar panel. The main difference is the amount of area which the solar panel occupies. Because the monocrystalline structure is more efficient than amorphous (and only very slighlty more so than polycrystalline) in turning sunlight into electricity, the amorphous solar panel of the same wattage will be physically larger. By the way, when talking about efficiency of solar panels, keep in mind that solar panel efficiency is still only about 13-18% efficient in turning sunlight into electricity. Often amorphous solar panels are less expensive than the crystalline panels. If space is not an issue, then an amorphous panel could be a great option. Additionally, amorphous solar panels perform better than crystalline solar panels in very hot temperatures and are also slightly more tolerant of partial shading.
Solar Energy for Home Heating & Cooling
Please keep in mind that solar panels produce electricity, and should not be used to produce electricity for heating or cooling sources. If heating is your main issue, be sure to check out Solar Air Heaters and Solar Water Heaters. Solar air heating and solar water heating are examples of solar thermal technologies which produce heat, but not electricity (and are much more cost effective than solar panels). While solar electric panels are not an economically feasible choice to power your air conditioning, a solar panel can power an attic fan that can help reduce the amount of time you use your AC.
Locating your Panels – Very Important!
A key factor in the effective use of solar electricity is proper placement of the solar panels. Make sure to locate the panels where they will receive full sunlight between the hours of 10 am and 3 pm. Be sure that the solar panels will not be shaded by shadows from tree branches, chimneys, other structures, etc. Once again – NO SHADE! You will be mounting the solar panels on the roof, the ground or a pole. For more information on the proper placement solar electric panels, please checkout the How To for Solar Panel Mounting article.
How Long will Solar Panels Last?
Solar panels use the sun’s light to generate electricity. They generate electricity during sunny daylight hours and can be used in a system with batteries so that the electricity can be used at other times as well. Also known as Photovoltaic (PV) modules, solar panels are the main component of a solar electric system. Along with an inverter, mounting system, batteries and Solar Charge Controllers, solar panels can produce electricity to power the energy efficient appliances and lights and appliances in most households. Solar panels themselves generally last over 25 years, and require little maintenance. Many of the first solar panels produced in the 50s are still in use today. Many of the solar panels have a 20 year warranty or more. A common warranty states that the panels will produce at least 80% of their rated power after 20 years.
What else will I Need with a Solar Panel?
In addition to the solar panel mounting hardware, there are additional components that you will need for a safe installation. If you plan on using just one solar panel in a battery based system (an off-grid system), you will need a solar charge controller and overcurrent protection to protect each major component of your system: solar panels, solar charge controller, deep cycle batteries, and inverter. If you plan on using more solar panels in your system, you will also need to safely wire the photovoltaic solar panels together and to the charge controller. An easy and safe way to do this is by using MC (multi contact) connectors. These connectors connect to the cables coming from the solar panel and can be cut in half to expose bare wire. Combiner & pass-through boxes are used to collect the bare ends of the wire from multiple solar panels; then from the combiner box you can run just one set of wires to the solar charge controller. For each series string of solar panels, you will need an appropriate sized breaker.
That’s a lot of components to figure out! If after reading all this you are a little confused but even more excited about solar energy, what’s next? Well, you can read more about solar panel systems. Also, our AltE U offers in-person workshops in Massachusetts and Ohio, as well as free education online videos. If you are considering installing your own solar electric system or installing PV (photovoltaic panels) as a business, be sure to check out our series of three classes beginning with our Basic Photovoltaic and Site Assessment class.
TIPS FOR BUYING YOUR SOLAR POWER SYSTEM.
Buying a home solar power system can be a very exciting experience, but don’t get too carried away by advertising. Be sure to focus on the important aspects of your purchase as it’s a substantial investment and one you’ll be living with for a long time. The following are some buying solar tips on what to look for when purchasing a system.
Ask friends, family neighbours or colleagues who have had solar PV systems installed. Often the best buying solar tips com from right in your neighbourhood. They’ll be able to tell you about their experiences and perhaps alert you to any problems they experienced. Problems that you’ll be able to avoid. Learn more about potential issues in our consumers guide to solar power – avoiding tricks and traps.
Length of manufacturer’s warranty
Take note of what guarantees the manufacturer offers. If the manufacturer is reputable and the warranty period on the panels is substantial (at least 25 years) you would naturally expect your solar system to last long for a long time, long enough to pay for itself and make you a profit. However, for a warranty to be honoured, the manufacturer needs to be still operating. So, be cautious of brands without a track record in Australia.
Have realistic price expectations
If you are paying substantially less than many other similar size systems quoted, you may find poor quality equipment and/or poor installation work. Quality equipment and installation isn’t cheap and, like all other purchases, you often get what you pay for.
Compare components and warranty periods and check into the company providing the installation. While large, well established companies can pass on substantial savings due to increased buying power, other companies often reduce costs by cutting important corners.
Solar panel certifications
This applies to all solar panel purchases, but especially to the purchases that could attract a government rebate. The certification on solar panels indicates the type of testing that they have undergone. For instance, TUV IEC 61215 confirms that the solar panels have gone through testing by an independent laboratory and have met their advertised specifications. Other certification types are often self-assessed. Therefore, they rely on the company being honest in what it claims.
Decide on the type of panels
It used to be the case that if you had limited roof space you would need highly efficient (and very expensive) mono-crystalline solar panels. This is rapidly changing with advances in polycrystalline panel technology and some thin film technologies. Still, even if you have ample roof space you may still want to consider panel sizes vs. output. Filling up your roof with inefficient panels will affect your ability to add more panels at a later date, and does not maximise the power output of the space.
It’s also important to bear in mind that regardless of claim, no solar panel technology will produce a significant amount of power in full shade. Learn more about monocrystalline vs. thin film panels.
Solar panel mounting
Make sure that the roof, ground mounting or tracking system is engineer certified for the area you are in. For example, if you live in a cyclone prone area make sure the mounting system and mounting brackets are also cyclone rated. Quality systems are wind certified. After all you do not want your system to take off during a wild storm . The mounting system is a very vital component and some suppliers skimp on this item. Make sure you ask about wind certification, warranty arrangements and get copies of relevant documents.
Solar inverter efficiency
A power inverter is the box between the panels and your appliances that converts DC electricity from solar panels to AC suitable for use in your home.
Not all solar inverters are equal and inverter efficiency will have a direct impact on the amount of time it takes for a system to pay for itself. Look at the inverter efficiency before purchasing a system. Obviously, the more efficient the inverter the better. Less electricity will be wasted as heat during the conversion from DC to AC. Industry leading solar inverters for grid connect systems in Australia include SMA, Sungrow and Fronius. Be cautious of generic type brands.
Get a few solar quotes
It always wise to gather a few solar quotes when making a major purchase as you will find that prices vary widely between providers. But don’t be just swayed by price as inferior components can reduce the up-front cost of the system. However, they may wind up costing you more in the long run in terms of reliability and efficiency.
Avoid high pressure sales people
High pressure sales tactics are unfortunately common in the solar industry. Try not to make decisions on the spot, just ask the person to let you consider the offer. If it’s as good as they claim, it will still be a good deal tomorrow. Pressured decisions on the spot often turn out to be less advantageous in reflection.
High pressure sales people are only one of the pitfalls that may await you when you shop for a solar power system. Learn more about the potential issues and how to avoid them in our consumers guide to solar power – avoiding tricks and traps.