Stellar

Efficient
by Design

Since its launch, the Stellar network has processed billions of operations and millions of payments, reflecting real demand for blockchain technology from fintechs, financial institutions, and developers around the world.

If blockchain will help power a more inclusive, equitable future of finance, it is critical that the underlying technology is also sustainable.

Sustainability and efficiency are integral to Stellar by design. Via the Stellar Consensus Protocol (SCP), a low-energy consensus mechanism achieved through Proof-of-Agreement (PoA), the Stellar network is designed to connect financial systems so they can work together seamlessly.

How much electricity does Stellar consume?

The Stellar Development Foundation enlisted PwC US to develop a framework to assess the electricity consumption and greenhouse gas emissions of blockchain protocols. The first-of-its-kind assessment framework provides a holistic view to inform and enable blockchain and financial services organizations to consider further measurement of their environmental footprints. The figures below were calculated using this assessment framework.

The following breaks down key metrics for Stellar’s electricity use:

Electricity consumed per transaction

0.173¹
(Wh/txn)

Estimated yearly electricity use for Stellar Core (program that runs SCP)

261,435²
(kWh)

Estimated yearly electricity use for Stellar Core + Horizon (API layer)

481,324³
(kWh)

In addition, the Stellar network generates:

Emissions per transaction

0.062¹
g CO2/txn

Estimated yearly emissions for Stellar Core

94,098⁴
kg CO2/yr

Estimated yearly emissions for Stellar Core + Horizon

173,243⁵
kg CO2/yr
Homes
Greenhouse gas emissions
from electricIty use for 1year
33.7
Stellar CORE AND HORIZON EMISSIONS 5
kg co2/yr
173,243
The Stellar network’s energy consumption has been minimal—but there’s opportunity for continued progress. With these numbers as the baseline for Stellar’s electricity consumption, the Stellar Development Foundation and Stellar ecosystem can use this data to chart a path forward; to better understand and identify opportunities to refine the technology, further help reduce environmental impacts, and commitment to removing any carbon emissions it cannot avoid.

Taking Action

Working with ecosystem companies, the Stellar Development Foundation:

1

Is establishing an ongoing carbon dioxide removal (CDR) commitment, paying for removal of carbon emitted by the network every year.

2

Will pay for the removal of the historical carbon footprint of the network since 2015. 6

Join the carbon dioxide removal initiative

If you’re a member of the Stellar ecosystem and would like to opt in to the carbon dioxide removal initiative, and help reduce the carbon footprint of the network, reach out to us.

Our Commitment as a Foundation

Being mindful of environmental impacts and building a culture of sustainability, the Stellar Development Foundation commits to reflecting that as an organization. SDF strives to track, report, and remove travel and event-related carbon emissions as an organization.

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¹As of March 2022

²The equivalent to CO2 emissions of 22.4 US households’ electricity usage per year/EPA.gov/Calculations & References

³The equivalent to CO2 emissions of 40.5 US households’ electricity usage per year/EPA.gov/Calculations & References

⁴The equivalent to greenhouse gas emissions from 18 gasoline-driven passenger vehicles per year /EPA.gov/Calculations & References

⁵The equivalent to greenhouse gas emissions from 33.7 homes’ electricity use for one year /EPA.gov/Calculations & References

⁶Electricity per transaction may have been different back in previous years  due to smaller network size.