The capex costs of reaching the Paris goals

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Green bonds offer an opportunity to compare the environmental impact of a range of different green projects when using a standardized measure. We use the unit measure tCO₂e avoided¹ per million euros invested to evaluate the impact of green bond projects across sectors and regions. Our research finds that not all investments in green projects have the same impact: some are more efficient at reducing carbon emissions than others. Using this information, and applying the inverse of our unit measure, we are able to estimate how much capex is needed to achieve the goals of the Paris Agreement.²

Vast amounts of green funding needed

Extensive investments are needed to achieve the global ambitions of net zero carbon emissions by 2050. To put the scale of the funding that is needed to transform the world economy into perspective, the International Renewable Energy Agency (IRENA, 2021) estimates that USD 4.4 trillion must be invested annually by 2050 for a 1.5°C climate pathway. This is to finance projects with an abatement value of approximately 1.23 GtCO₂e per year,³ including energy transition technologies (renewable energy, end-use electrification, hydrogen innovation) and carbon removal measures. This amount of investment will imply a cost of USD 3,550 per ton of CO₂e reduced.

Accounting for the world’s largest asset class, the global fixed income market has a critical role to play in financing the transition to global net zero emissions. The rapidly growing green bond market will play a vital part in this.

Robeco’s fixed income team has been investing in green bonds since 2013 and uses its proprietary five-step green bond screening process to determine whether bonds truly are green. By the end of September 2021, Robeco’s investments in green bonds totaled approximately EUR 3 billion.

Impact reporting of green bonds provides useful information that allows us to assess green projects across sectors and regions from a carbon-abatement-efficiency perspective. We define this comparison as a ‘green impact premium’. This, in turn, enables us to assess the best approach to follow in funding the transition to a green economy.

Deriving a metric to assess green projects

We applied information from more than 440 green bond impact reports from 118 different issuers (from 26 countries and 13 different sectors), and calculated the avoided tons of CO₂e emissions per million euros invested for each green bond.

Derived from green bonds, this metric allows investors to compare the climate change mitigation impact of green bonds and simplifies impact reporting for issuers as well as investors. Investors can aggregate the impact metrics of different bonds in their investment portfolios to obtain a portfolio-level impact indicator and, in this way, managers interested in the mitigation potential of their portfolios can use this indicator to select green bonds that are the most efficient from a carbon abatement perspective.

There were interesting regional differences in these findings. The abatement efficiency of renewable energy projects was higher for projects located in countries with carbon-intensive energy schemes. These projects avoided 78% more CO₂e emissions than projects in Europe, implying an average capital cost of EUR 736 per ton of CO₂e avoided, significantly below our estimate of the global average for the sector.

On average, projects related to green buildings produced the lowest level of greenhouse gas abatement compared to other types of projects: they facilitated the avoidance of 12 t CO₂e per million euros invested. We believe there may be two reasons for this relative underperformance in abatement efficiency. First, the building sector is less expensive to decarbonize and has less abatement potential than other sectors. Secondly, there has been significant progress in improving the energy efficiency of buildings across countries, reducing the current cost differential between green buildings and traditional ones.

Low-carbon transportation projects, which include infrastructure for clean energy vehicles (electric, hydrogen, hybrid), public, rail, and multimodal transportation, are also shown to have high CO2₂ reduction potential, at 240 t CO₂e per million euros invested. Within this category, we found that public transportation projects (passenger rail transport, tram) have higher abatement potential than passenger cars and light commercial vehicles (41 t CO₂e per million euros invested).

The activity with the second-largest abatement potential is energy efficiency (smart grids, district heating, energy storage, heat pumps) with 631 t CO₂e per million euros invested. It is expected that energy efficiency improvements will contribute 25% of the total mitigation needed to be aligned with a 1.5°C scenario (IRENA, 2021). One clear example is related to heat pumps, which can be powered by renewable electricity and achieve two to five times higher energy efficiency than fossil-fueled boilers.

Assessing the investment opportunity and its scale

Our findings suggest that the existing technology gap between green and traditional alternatives is smaller in the building sector than in the energy sector, which has implications for what investments should be targeted. In particular, sectors in which unabated emissions are higher and technology gaps still exist, such as the energy sector, should receive more abatement investment, to smooth their decarbonization pathway.

Considering the implicit costs of investing in renewable energy and energy-efficiency projects, such as in end-use electrification, power grids, etc., and using the information derived from the green bond impact reports, we can estimate the total value of investment needed to achieve net zero. Our calculations show that the world will need to invest EUR 121.7 trillion in these sectors by 2050. This represents an average annual fund requirement of EUR 4.1 trillion.

To achieve this, the annual capital expenditure in renewable power generation must multiply by 4.5 times, while energy efficiency capex must increase by 2.5 times.

Important information

This information is for informational purposes only and should not be construed as an offer to sell or an invitation to buy any securities or products, nor as investment advice or recommendation. The contents of this document have not been reviewed by the Monetary Authority of Singapore (“MAS”). Robeco Singapore Private Limited holds a capital markets services license for fund management issued by the MAS and is subject to certain clientele restrictions under such license. An investment will involve a high degree of risk, and you should consider carefully whether an investment is suitable for you.