Green bonds account for a tiny proportion of the global bond market but have significant growth potential as consumers become increasingly concerned about environmental issues, such as climate change. The issuance of green bonds could also support governments worldwide in undergoing a green transition.
Green bonds contribute to projects that support the environment, such as renewable energy, clean transportation, and pollution reduction. They have become a means for governments and companies to attract investors who care about sustainability and addressing climate change. The market has also grown as companies have incorporated stricter environmental, social, and governance (ESG) practices into their operations.
Green bonds often provide tax incentives, such as credits and exceptions, making them more attractive to investors. There are several official bodies that oversee the sector to ensure that specific green bonds deliver the environmental benefits they were designed to achieve, such as the Climate Bonds Standard Board.
In 2012, a total of $2.6 billion in green bonds was issued worldwide, a figure that has risen dramatically in recent years to $575 billion in 2023, with governments accounting for $190 billion of the total. The demand for green bonds is expected to continue increasing as more companies incorporate ESG practices and several governments strive for a green transition. The issuance of blue bonds, which raise capital specifically for marine- and water-related projects with long-term environmental benefits, has also increased in recent years.
In the second quarter of 2026, global green bond issuance totalled $193 billion, marking a record quarter and driven largely by European issuers, according to a report from the ratings agency Moody’s. Overall, Moody’s report showed that global issuance of labelled sustainable bonds – such as green, blue, social, sustainability, sustainability-linked, and transition bonds – rose by 4 per cent year-over-year in the second quarter of 2026.
However, green bonds account for just around 3 per cent of the global bond market. The recent low uptake in this sector has been largely attributed to regulatory complexities, high issuance costs, greenwashing, and inconsistencies in definitions of “green” and “sustainable”, according to a report from the Institute for Energy Economics and Financial Analysis (IEEFA). However, there is significant potential for the sector to grow in line with a global green transition.
Labanya Prakash Jena, a consultant for sustainable finance at IEEFA, explained, “Green bond labelling is central to the credibility, transparency and effectiveness of green bonds. However, green bonds face significant challenges that can undermine their efficacy – most notably, greenwashing.” Jena added, “The absence of robust monitoring and reporting mechanisms exacerbates greenwashing, and addressing this is important to ensure that green bonds achieve their intended purpose of financing genuinely sustainable projects.”
This suggests that if a more comprehensive definition of green bonds is established and better monitoring and evaluation methods are implemented, green bonds could become more attractive, particularly during a period of green transition. This may be more attainable in high-income regions with greater access to data, technical expertise, and credible verification services to support reporting obligations.
In the United Kingdom, the Commonwealth think tank has urged the government to provide universal entitlement to solar panels through a “solar bonds” scheme. It proposes that household solar power systems could be paid for using a model similar to that of national savings investments, more widely known as premium bonds, in which savers would receive interest payments on their cash in return for funding the scheme. This, the think tank argues, would help consumers to slash their energy bills by around £250 a year.
Donal Brown, a senior researcher in energy policy and political economy at the Environmental Change Institute at Oxford University, and the lead author of the Common Wealth report, suggested that households should not be deterred from the loan attaching to the property. Brown explained, “If you move out, the loan and finance stay with the home, and without any kind of complex means testing. This is a state-backed product that everybody would be eligible for. Default rates on the standing charge are incredibly low, so it’s a secure way of tying those repayments.”
This scheme would allow households who cannot afford the upfront cost of a rooftop solar installation to benefit from solar power without the high premiums associated with private loan programmes. The solar bond mechanism is similar to municipal bonds already used to finance infrastructure in countries such as the United States, which makes it easier to understand. If successful, the scheme could provide a blueprint for other governments to use, thereby encouraging broader residential solar PV uptake.
While green bonds continue to account for a small proportion of the overall bond market, there is significant potential for growth. Green bonds are expected to continue to grow in popularity in line with companies’ ESG practices, the rising consumer focus on sustainability, and government green transition targets.
By Felicity Bradstock for Oilprice.com