• What is SolarCoin?
    SolarCoin is an alternative digital currency that works like air-miles for Solar electricity generation. SolarCoin is claimed by individuals living in homes with Solar Energy panels on their roof or large solar electricity farms.


    Solar energy, unlike fossil fuels, does not place excess heat or carbon into the atmosphere. The long term intent is to provide an incentive to produce more solar electricity globally over the next 40 years by rewarding the generators of solar electricity.  SolarCoin is intended to shift the levelized cost of energy (LOCE). Source: SolarCoin Wiki

    Technical details relating to SolarCoin are on Github.com/solarcoin

    See what the World’s media is saying about SolarCoin.

  • How do I get SolarCoins?

    1. Download and install a Wallet.

    2. Solar energy related charities may reach out to the SolarCoin Foundation for a SolarCoin grant for the charity and its members.

    3. Claim SolarCoins section of the SolarCoin.org site. Submit a proof of Solar electricity generation in the form of a verifiable meter reading from your countries geography and or regulatory regime. Each 1MWh generated entitles you to §1 SLR coin. An e-mail confirming your electricity generation and SolarCoin is sent out every 6 months for the next 20-25 years you generate power and receive more SolarCoins.

    SLR Grant


  • How can I start accepting SolarCoins for my business or charity?

    1. Download a SolarCoin wallet from below.
    2. Find your SolarCoin address in the wallet application.
    3. Display your SolarCoin address or QR code on your website or on a physical sign.

    SolarCoin accepted here3
    That’s it! You can now receive SolarCoin as donations or payment for goods and services.

  • What is one MWh's worth of electricity?

    Each circulating SolarCoin represents 1MWh (megawatt hour) of solar electricity generated. Each 1 MWh of renewable electricity displaces more than 1,500 lbs of carbon dioxide that would have been released by burning fossil fuels like natural gas and coal.

  • Who created SolarCoin and who is managing it?
    SolarCoin was created by a group of volunteers interested in creating an incentive to benefit the environment. SolarCoin is an open community project run by Volunteers working together as the SolarCoin Foundation.  Anyone can join and participate. See the volunteer page.   More information is on the SolarCoin Wiki and SolarCoin Forum.

  • What is the SolarCoin Foundation?
    The SolarCoin Foundation is an international network of volunteers managing the distribution of SolarCoins to Solar Electricity Generators using verified meter readings as the “proof of work”.

    The SolarCoin Foundation maintains a public ledger detailing each SolarCoin given out to solar electricity generators. The transactions are also publicly visible in the SolarCoin Blockchain.

  • When did SolarCoin start? How long is it going to last?

    SolarCoin launched in January 2014.  The supply of SolarCoin is designed to last 40 years delivering incentives for generating 97,500 TWh of solar electricity. The SolarCoin network grows as more people claim SolarCoin.

  • How are SolarCoins allocated?

    SolarCoins representing 97,500 TeraWatt hours of solar energy generation are held in reserve:

    • §33.7 Million SolarCoins (0.1%) will be mined using Proof of Work. All mined SolarCoins represent historically generated and unclaimed solar electricity. Technical specs are on github/solarcoin.  The Blockchain explorer is here.
    • §97.5 Billion SolarCoins (99.4%) are stored in the SolarCoin Foundation non-circulating generator pool account. These are exchanged for ongoing claimed “proof of work” of solar electricity generation submitted over the next 40 years. Each 1MWh of solar energy is entitled to 1 SLR. According to the IEA were an estimated 147 Million MWh of Solar electricity produced by PV & CSP in 2013. This would equal 147 million potential SolarCoins claims per year.

    SolarCoin Issuance Process:

    –         Solar energy generated from a verified meter reading

    –         SolarCoin Foundation & community verifies claim and records issuance in public ledger

    –         SolarCoin Foundation sends coins from reserve account to claimant (visible in the blockchain)

    –         SLR claimant spends / circulates coins using wallets etc.

    • §500 Million SolarCoins (0.509%) in the genesis pool account representing environmental charities, early volunteers, advisers, builders and maintainers of SolarCoin infrastructure will circulate.  Genesis pool circulation is restricted to never being more than 5% of total SolarCoin in circulation.
    SolarCoins have been granted to 17 out of 215 countries so far. Claim SolarCoins here.
  • How can SolarCoin currency be environmentally friendly?
    SolarCoin works like Air-miles for to incentivize generation of global solar electricity. Solar power is an abundant, renewable energy source that avoids the pollution from coal and nuclear plants. Every megawatt-hour of electricity generated through a solar PV panel avoids more than 1,500 lbs of carbon dioxide (CO2), more than 5 lbs of sulfur dioxide (SO2), and almost 2 lbs of nitrogen oxide (NOx), and it also avoids producing radioactive nuclear wastes.  Solar energy production is highest on hot, sunny days when air conditioners are running and electricity demand peaks.  By providing energy during peak demand times, that same solar energy that warms an area can be captured and used to power those devices.

  • How is SolarCoin different from Bitcoin?

    SolarCoin is not a replacement for Bitcoin. It is a complementary currency using Bitcoin technology implemented to incentivize global Solar electricity generation over the next 40 years.



    Incentivize global solar electricity for the next 40 years.


    Create a decentralized currency

    SolarCoin Foundation


    Satoshi Nakamoto


    Launch date


    Open source community

    Project support

    Open source community

    §98.34 billion

    Maximum issuance

    21 million

    <§33.6 million

    Current circulation

    >15 million

    Est. §1.0 million 

    Next years circulation increase

    Est. 1 million

    Free market supply & demand

    Currency target value

    Free market supply & demand

    Coins & paper wallets 

    Physical format

    Coins & paper wallets (bills)

    (Proof of Solar 1MWh generation, energy grants) & proof of cryptographic Stake by SolarCoin

    Equitable circulation methodology

    Proof of cryptographic work by algorithm

    1 MWh of solar electricity generation

    Value representation


    Windows, Linux & MacOS & Android(soon)

    Operating Systems

    Windows, Linux, MacOS, Android & others





    Largest holder of circulating currency


    SolarCoin Foundation

    Largest holder of reserve currency


    $20 (2018 target)

    Market value


    1440 blocks (daily)

    until Sep 21,2015

    Difficulty adjustment

    2016 (2 weeks)

    §0.5 SLR*

    block reward

    50 BTC


    Hashing Algorithm


    Fixed at 0.5 moving to Proof of Stake Sept 21, 2015

    Block reward decay rate

    50% every 4 years

    Done as of July 2015

    95% public mining done

    17 years

    2040 (estimated Solar Energy production)

    95% in circulation by


    LiteCoin & Vericoin source code fork

    Source Code

    Bitcoin original source

    This Wiki Page highlights the primary differences. A Blockchain explorer is here.

  • Are there physical SolarCoins?

    There aren’t any physical SolarCoins in circulation yet. It is possible for people to create them in a fashion similar to physical bitcoins and paper wallets. A physical SolarCoin might look similar to this. The SolarCoin Foundation doesn’t endorse, verify or authenticate any SolarCoin issuer, producer, agency or service related to SolarCoin. A list of non-endorsed service providers including a SolarCoin paper wallet creator is available in the wiki page SolarCoin exchanges and other services.

    NewMockGold_1280x960SolarCoin Stack Small_1280x960

    SolarCoin Pile Large_1280x960

    These images are provided like all content on the site as creative commons with rights of attribution only. Available in high resolution upon request.

Solar Energy

  • How can solar energy deliver my energy needs?

    It is a fact within the industry : depending on the latitude, solar power has now achieved Grid Parity. This means solar panels may deliver electricity at a cost-effective price and compete with traditional fossil sources. A typical solar field will operate 20years or more, and have very little Operation&Maintenance costs. Most of its components are also highly recyclable.

    Today, the remaining challenges for implementing Renewable Energies on a wide scale and in particular Solar Energy are 1) Energy Storage and 2) the deployment of a Smart Grid.

    1) Energy Storage can be viewed as a means of storing the energy needed for delayed consumption. Energy can be stored in different ways. Several technologies are at trial level and some are currently entering industrial production : Lithium Batteries for example are entering widespread production for the auto industry with some well recognized brands.

    2) The deployment of a Smart Grid has long been discussed. It is now becoming a reality. In Europe for example, based on the 2009 Desertec initiative a supergrid is being created to connect North Africa to Europe and deliver efficient solar energy to the network.


    In implementing these technologies, millions of jobs will be created across the world.

  • Why energy? How is energy related to the economy?
    Energy and knowledge are key resources in the economy. These resources are fundamental to improving life for all of us.
    GDP vs. MTOE (Metric Tons of Oil Equivalent) from The Nature of Value.

    GDP vs MTOE
  • How is 1 MWh (megawatt hour) of energy put into a coin?

    Each SolarCoin in circulation represents 1 MWh of solar electricity generation. Each SolarCoin in electronic form represents the verified and proven work of 1 MWh of solar electricity generated. The idea for creating an energy backed currency is derived from an academic paper; DeKo: An Electricity-Backed Currency Proposal. SolarCoin is designed to help shift the levelized cost of energy (LOCE) in favor of Solar energy.

  • Why Solar energy?
    Generating MegaWatts with solar energy is good for the Planet
    Generating megawatts with solar energy is good for the Planet. Heat is an unavoidable by-product of the energy extracted from non-renewable energy sources. Renewable energy using direct or indirect solar energy are accounted for in the thermal balance of our planet, their use adds minimal heat to the environment. Solar energy is the largest renewable energy source available. Wind, Hydro, Geothermal and Biomass energy sources combined don’t add up to the amount of Solar energy landing on Earth’s surface every day (Source data). In addition, Wind, Hydro, Geothermal and Biomass electricity generally require industrial size implementations to be cost effective. Even small groups or individuals can use PV panels to earn SolarCoin.The cost to capture solar energy is decreasing rapidly as more solar energy systems are deployed. For every doubling of Solar Power deployed, the cost drops an estimated 20% for follow on systems due to experience curve effects. EIA Experience curve Data available here.

  • How does SolarCoin help generate renewable electricity?

    SolarCoin is a monetary incentive for electricity generators which helps to tip the rewards of energy generation in favor of renewable sources rather than fossil fuels. SolarCoin is intended to shift the levelized cost of energy (LOCE) towards solar energy sources.

  • How is renewable electricity generation verified?
    Many electronic and manual methods of verification will evolve for different countries and regimes. All claims for SolarCoin will require meter derived proof from a verified generation source and owner. The SolarCoin community will vet all verification methodologies. These methods will rapidly adapt efficiencies seeking maximum ease of use while preventing fraudulent claims.

    Most electric meters have online APIs and web reporting. These can be integrated with SolarCoin verification methods. Inverter manufacturers, meter companies and large systems integrators are invited to partner with SolarCoin to integrate customer web based reading methodologies with the SolarCoin granting community.

    Most SolarCoins are held reserve in publicly visible non-circulating accounts by the SolarCoin Foundation, an open community project. Over 99% of these coins will be distributed to renewable power generators and renewable energy related projects over the coming years.

  • What is Global Horizontal Irradiance?
    The radiation reaching the earth’s surface can be represented in a number of different ways. Global Horizontal Irradiance (GHI) is the total amount of shortwave radiation received from above by a surface horizontal to the ground. This value is of interest to photovoltaic installations and includes both Direct Normal Irradiance (DNI) and Diffuse Horizontal Irradiance (DIF).


  • How does the SolarCoin generator issuance process work?
    Electricity meter readings and other 3rd party community agreed verification methods ensure that each SolarCoin represents 1 MWh of solar electricity generation. Verification mechanisms will be created by volunteer country coordinators and agreed to by the community. Each method will be created, adapt and operate for increasing ease of use and fraud prevention over time. Methods will vary for residential versus large scale commercial verification claims.
  • How can we trust the SolarCoin Foundation to not dump SolarCoins?
    The SolarCoin Foundation controls circulation to generators. It is made of members of the SolarCoin community. All transferred circulating issuance are publicly announced via a public ledger as well as being able to be monitored in the SolarCoin blockchain.
  • Why is each SolarCoin standardized on 1MWh?

    The megawatt hour (MWh) is a unit of electrical energy equal to work done by one megawatt acting for one hour. One megawatt is equivalent to one thousand kilowatts. The MWh is a recognized physical unit of energy and serves as useful proof of work for equitable and useful SolarCoin distribution.

    Nameplate capacity refers to the intended technical full–load sustained output of a facility such as a power plant. Nameplate capacity is the number registered with authorities for classifying the power output of a power station usually expressed in megawatts (MW). In the case of solar photovoltaic applications, we refer to kWp (Watt Peak).

Claiming SolarCoins

  • How many SolarCoins can I expect to receive annually?
    SolarCoin grants are made at the rate of 15% of Nameplate Capacity.

    The annual calculation is 365 days X 24 hrs X 15% X Your KW Nameplate Capacity. This works out to 1.314 X your installed KW Nameplate Capacity. The initial SolarCoin grant is retroactive to the install date of your facility or Jan 1, 2010; whichever is more recent. Ongoing SLR grants are made every 6 months based the facility install month.

    Various international groups recommend or accept this methodology as a proxy for solar electricity generation.

  • What information or documents do I need to collect to claim SolarCoins?

    To claim your SolarCoin, the following information needs to establish:

    1. You are a valid claimant.

    An email address and first and last name are required; ideally linked to a Facebook,  Linkedin or other social media profile that can be verified.

    2. There is a verified generating facility.

    A digital copy of documentation or a link verifying the nameplate capacity, installation date, location and other information relating to the generating facility.

  • Does this cost me anything?
    There is no cost. Participation in the SolarCoin community and granting process is free.
  • What if my solar facility is off-grid?

    Off-grid facilities are currently eligible for SolarCoin grants at the rate of 15% of Nameplate Capacity provided documentation is submitted verifying the nameplate capacity, installation date and location.

  • Can I claim SolarCoins if I am leasing my system?
    Residents of dwellings or homes acting as generator facilities may claim SolarCoins.

  • Why do grants for generating systems located at residential dwellings go to the resident rather than the facility owner or lease holder?
    Many smaller systems are leased or financed. The SolarCoin mission is to incentivize solar electricity generation. Grants to large generators or firms are important, but so is growing the economic community of SolarCoin participants and holders. Residents of homes with residential generating facilities are often the primary consumers of that power.  The SolarCoin Foundation believes that incentivizing the residential consumer directly creates a larger participating base of SolarCoin users and incentivizes Solar electricity generation.

  • Where can I see a list of all the SolarCoin grants?
    The SolarCoin volunteers are working on building a publicly available database to show the grants, recipients and generating facilities. This information is being privately collected and will be made publicly available in a limited fashion only upon confirmation with the grant recipients.

    Every consideration is being made to strike the balance needed to respect individual privacy with transparency for the community to prevent fraud and build trust.  Grants are of course visible with a confirmation ID in the Blockchain.

  • What is the confirmation transaction ID how is it read?
    The confirmation transaction ID is a message put in the block chain for each grant. The format for the message is as follows:

    Lisa Smith example raw data concatenation for Grant Transaction GUID

    Transfer type Country code Post code Generator UID Nameplate capacity Claimant UID Facility Interconnection Date Last Grant Issued Date
    GRT US 85032 01 5.64 01 2011-07-01 2013-07-01

    Final blockchain message Transaction example GUID=  GRT-US-85032-01-5.64-01-2011/07/01-2013/07/01

    Transaction GUID ontology & taxonomic design principles:

    The transaction GUID is organized from most general to specific & from most stable to highly variable factor.

    The transaction message GUID will be separated by “-”s

    – Type of transfer from the generator or genesis pool GRT (for grant) a 3 letter convention will allow for further TLD (Three Letter Declarations in the chain later).

    – Generator UID:

    – Country (http://en.wikipedia.org/wiki/ISO_3166-2)

    – Post code country specific standard (http://en.wikipedia.org/wiki/Postal_code)

    – UID (assigned by database incrementally subject to country and post-code) this allows for an (I was first in my area) etc. claim.

    – Nameplate capacity (declared in KW at the point and time of interconnect or most recent update if expanded/damaged.)

    – Claimant UID:

    – UID (assigned incrementally by database)

    – Dates:

    – Using ISO convention from most to least significant (yyyy/mm/dd)

    Note: The claim amount is not included as it is implicit in the transaction amount at 1SLR to 1MWh and will be found as the transfer amount with the transaction ID in the blockchain.

  • Is my claimant information kept private?

    Participating in the granting program is voluntary and the default is to keep all information private. Upon completion of the program, a request will be sent to make some information public. You may opt out of this request and still retain your SolarCoins.

  • What countries are participating and what languages are supported?
    Volunteers are verifying all countries. Volunteers are encouraged to sign up or participate in their countries section of the SolarCoin Forum to speed the claim development process and technology build out.
    SolarCoins have been granted to 17 out of 215 countries so far. Claim SolarCoins here.
  • I am an installer, what should I do?

    Currently, many countries have cut down on their subsidies for solar power. As a result, SolarCoin may represent a new and needed alternative for incentivizing solar applications.

    For an installer, SolarCoin represents an alternative free revenue for promoting solar power and the use of renewable energies. The installer is entitled to the 10% Bounty.

    The SolarCoin Foundation is reaching out to installers who want to participate in the SolarCoin programme. We invite all installers to contact us to receive their SolarCoin marketing kit.

Creating and using your SolarCoin Wallet

  • How do I create my own wallet?

    Download your own SolarCoin QT wallet by following this simple 2-step process :

    Step 1: Download the SolarCoin-Qt wallet software for your operating system from the official SolarCoin website here.

    Step 2: Install the SolarCoin-Qt wallet software and wait for the software to synchronize with the network.

    Note: The software will need to ‘catch up’ with the network, this process may take a few hours. You can close the wallet at any time during this process, the program will continue where it left off until the synchronization is complete.

  • How do I receive SolarCoin into my wallet?

    To receive SolarCoin, select in the “Receive”  tab the address you wish to receive the SolarCoin to (an address has already been pre-generated). Select the “copy address” tab. Paste and send this address to anyone who should send you SolarCoin.

  • How do I send SolarCoin from my wallet?

    To send SolarCoin you will first need the recipients SolarCoin address (it should look like something like this 8LKwfeiPuyh6qkQjfiDFftJchgRj9ab72m).  Knowing the recipients address, select the “Send” tab and paste the address in the “Pay To” blank field. You may also enter the recipients name in the “Label” field for future transactions. Enter the Amount of SolarCoin to send in the “Amount” field and press “Send”. The recipient should receive his SolarCoin within the next 10-15 minutes.

  • How can I prevent my SolarCoin from being stolen?

    The first thing to do after downloading your wallet is to “encrypt” it. Select the “Settings” tab followed by “encrypt wallet”. A popup will appear asking for a New Passphrase to be entered twice (enter a complicated password of at least 13 alphanumeric characters). Do not lose your password as your coins will be lost.

  • How can I prevent my SolarCoin from being lost?

    Like any important data on your computer it is very important to back up your wallet. Select the “File” tab followed by “Backup Wallet”. Browse to the folder you wish to save the backup to and name the file “wallet” and save. Remove the Backup File from your computer and store it in a safe place (USB drive…)

  • How do I install my old SolarCoin wallet onto a new computer?

    You must have a backup in order to recreate your wallet onto a new computer. Assuming you followed the instructions above and created your backup wallet, follow the next steps.

    Step 1: Install the SolarCoin QT wallet software as described and run the program once installed.

    Step 2: Close the program.

    Step 3: Browse to the following default folder…

    Windows: C:\Users\{YourUserName}\Appdata\Roaming\SolarCoin

    Mac: ~/Library/Application Support/SolarCoin/

    Note: These folders may be hidden, in this case you will need to view hidden folders on your operating system.

    Step 4: Copy and paste your Backup File directly into the opened SolarCoin folder. This will replace the currently existing folder with your backup.

    Step 5: Run the SolarCoin QT wallet software once more. You will see that your old wallet is now back.

  • How do I invest in SolarCoin?

    Step 1 : Download the SolarCoin QT Wallet from the SolarCoin website www.solarcoin.org and install it on your Computer (you may check the FAQ “Creating and using your SolarCoin Wallet”),

    Step 2 : Register on an Exchange website such as CoinBase (www.coinbase.com) or Bitstamp (www.bitstamp.com). Upon completing the registration process you will be asked for banking and personal information ; these are required to authenticate your identification (note: this process may take up to a week). After this process is completed you will be able to send funds to your Account for converting to Bitcoin (note: it is always prudent to make your initial investment relatively small in order to familiarize yourself with the procedure).

    Step 3  : Once the funds are in your CoinBase (or other Exchange) Account, you will have the option to convert them all or partially to Bitcoin. Once the Exchange has been made you will see your new balance in Bitcoin.

    Step 4 : To convert your Bitcoin to SolarCoin you will first need to create an Account on a supported Exchange such as Bittrex (www.bittrex.com). Once your Account is created and confirmed you will be able to view your online wallet. Search for BTC (Bitcoin) and copy the Depositary Wallet Address (note: if there is no Depositary Wallet Address then there will be an option to generate one).

    Step 5 : From your CoinBase, BitStamp or any other Bitcoin related Exchange Account, you will need to “Withdraw” your Bitcoin by following the “Send” or “Withdraw” tab and pasting the Bittrex BitCoin Depository Wallet Address (as mentioned in Step 4). This process will be performed within  10 to 30 minutes.

    Step 6 : In your “Wallet” Account at Bittrex, you will likely see a pending or unconfirmed total of the transfer you have made (allow at least 10 minutes for unconfirmed balance to appear). Once debited from your CoinBase (or other Exchange Account) and credited on your Bittrex Account, you will be able to trade directly from Bitcoin to any other supported coin including SolarCoin (SLR).

    Step 7 : Once you have completed your Exchange from Bitcoin to SolarCoin, it is strongly recommended that you withdraw from your Exchange to your SolarCoin Wallet located on your Computer so as to keep your SolarCoins in a safe place. You will need to copy the “Receive” Address from your SolarCoin Wallet on your Computer and “paste” it into the relevant Withdraw (or Send) field on the Exchange.

    Step 8 : IMPORTANT: ALWAYS BACK UP YOUR WALLET. Please read the above-mentioned F.A.Q.’s “Creating and using your SolarCoin Wallet” for instructions on this.