Making an impact through our...


Our passion to make an impact through essential assets and income investing is reflected in every investment decision we make. As impact investing gains momentum, we see exciting opportunities on the horizon in which we can provide capital to organizations that are essential to the economy and make a positive impact on our society and environment. We believe our long-term impact investing discipline will deliver competitive returns while managing risk for our investors who appreciate socially responsible investment strategies. Investment opportunities abound in the sustainable infrastructure asset universe serving essential needs in society.

From supporting the nation’s charter school network for underserved neighborhoods, to impacting the global water crisis through water infrastructure and treatment facilities investments, to funding renewable energy and low carbon energy infrastructure wind and solar projects, we are making an impact that goes far beyond our legacy energy investing focus.

Social Infrastructure

The need to improve the social infrastructure network in America has never been greater. We seek to fill a funding void through direct lending opportunities that support a range of services including education, healthcare, housing and other social services.

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Sustainable Infrastructure

Our sustainable infrastructure strategy powers the future of the energy space and provides global access to water.

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Energy Infrastructure

Energy infrastructure is critical to daily life as it connects energy production to end users so we can drive cars, heat and cool our homes and use electricity.

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Social Infrastructure

Social infrastructure is an essential asset that supports and facilitates social services. Tortoise provides capital for social infrastructure projects related to private nonprofits, 501(c)(3) organizations, public nonprofits and other entities authorized to issue private activity and tax-exempt municipal bonds focused on education, healthcare, housing and other social services by investing in directly originated credit and preferred equity securities.

 Our social infrastructure investments are making an impact through:

Educational Services

  • Charter schools
  • Vocational/technical schools
  • Community/junior colleges
  • Private schools
    • Special needs
    • Early education

Healthcare Services

  • Senior living
  • Hospitals
  • Medical care centers
    • Rehabilitation
    • Psychiatric
    • Substance abuse
  • Nursing and residential care

Housing Services

  • Student housing
  • Military housing
  • Affordable housing

Energy Efficiency and Project Finance

  • Industrial infrastructure/utility projects
    • Water treatment plants
    • Recycling centers
  • Nonprofit/human service providers
  • Sustainability projects
    • Waste-to-energy
    • Biomass



Students receiving education at charter schools
Total capacity in charter schools
Individuals employed at charter schools
Residents served through senior living facilities
Total capacity once all senior living facilities are completed
Individuals employed at senior living facilities
CO2 equivalent greenhouse gases saved through sustainable investments
281,000 MMBtu
of energy saved through sustainable investments
412 MMgal
of water saved through sustainable investments

Sustainable Infrastructure

A community thrives when sustainable infrastructure is in place. We see opportunities to make a tremendous impact through our investments in essential energy and water investments including renewable and low carbon energy infrastructure wind, solar and battery storage assets. With global access to safe drinking water at crisis levels, investments are needed in water infrastructure and treatment facilities to improve and sustain lives.

Tortoise is making an impact through the companies in which we invest.

Spotlight: Xylem

Xylem is a leading global water technology company providing a broad portfolio of solutions addressing customer needs across the water cycle, from the treatment, delivery, measurement and use of drinking water to the collection, test and treatment of wastewater to the return of water to the environment

  • Core application areas include transport, treatment, test, smart metering, smart infrastructure analytics and leak detection
    • Believe technology is a key link in how the world can solve water supply / demand imbalance and currently focusing on capabilities of smart technology, integrated management and big data
  • In addition to technology solutions XYL provides to customers, the company is committed to reducing its environmental footprint
    • Goals incorporated into business operating planning includes improving product energy efficiency, reducing water use and waste sent to landfills, and achieving 100% environmental compliance at all manufacturing and service sites
  • Strong governance policies, board independence and sustainability steering committee to guide and drive sustainability efforts and goals
    • Company has a strong corporate culture built around volunteerism in water-related activities; it has committed to logging 100,000 volunteer hours between 2016-2018
Team of Xylem employees volunteer their time to construct an AquaTower in Puerto Rico following Hurricane Maria. The AquaTower, supplied by Xylem’s partner Planet Water Foundation, provides safe, clean water to more than 1,000 people per day

Team of Xylem employees volunteer their time to construct an AquaTower in Puerto Rico following Hurricane Maria. The AquaTower, supplied by Xylem’s partner Planet Water Foundation, provides safe, clean water to more than 1,000 people per day

Storm-preparedness: Xylem’s dewatering pumps in action following a storm.

Storm-preparedness: Xylem’s dewatering pumps in action following a storm.

Spotlight: Geberit Group

Geberit Group a globally-oriented, European market leader in sanitary technology, and leads the sanitary sector in sustainability

  • Offers a comprehensive product line that supplies high-quality, integrated and water-saving sanitary technology and uses minimal water during their product development process
  • Holds supply chain partners to an equally high sustainability standard
  • Green-friendly buildings
  • Strong governance policies, board independence, and ESG governance committee
Geberit waste water tower: a variety of installations for building drainage that can be simulated realistically.

Energy Infrastructure

Energy infrastructure is critical to daily life as it connects energy production to end users so we can drive cars, heat and cool our homes and use electricity. Pipelines are the toll roads that carry energy products from areas of supply to areas of demand. It also facilitates U.S. exports of energy that help with U.S. energy independence and feeds the U.S. economy.

Tortoise is making an impact through our investments in midstream energy infrastructure

Spotlight: Enviva Partners, LP

Enviva is a leading global energy company specializing in sustainable wood bioenergy. The company is the world’s largest producer of wood pellets, a sustainable and renewable alternative to coal, and part of an all-in strategy to reduce carbon emissions, limit dependence on fossil fuels and mitigate climate change.

Enviva owns and operates seven wood-pellet production plants in the Southeastern United States with a combined production capacity of over 3.5 million metric tons of wood pellets per year. It exports wood pellets through deep-water marine terminals in the Southeastern U.S. to customers in the U.K., Europe, Asia, and the Caribbean. Its customers use its pellets as a renewable and reliable energy source, including as a drop-in substitute for coal in existing power generation infrastructure. Enviva sells a significant majority of its wood pellets through long-term, take-or-pay agreements, enabling its customers to reduce their carbon footprint by up to 85% on a lifecycle basis and help meet their renewable energy generation goals. 

To date, Enviva has displaced over 14 million metric tons of coal through its replacement with sustainable wood pellets. In addition, carbon sequestration from the atmosphere has increased by 14% in Enviva’s sourcing region due to growth in forest inventories. 

The company has a very public and strong commitment to sustainability and has developed sustainability initiatives that go well beyond the legal and certification requirements, such as adoption of its Responsible Sourcing Policy and public reporting on its progress and impact in its sustainable wood sourcing. Enviva’s production facilities are certified to the stringent standards of the world’s foremost forestry organizations, such as the Sustainable Biomass Program (SBP) and others. In addition to third-party certifications, Enviva’s sponsor developed “Track & Trace®,” a proprietary sustainable sourcing program, which provides transparent, publicly available data about its wood sourcing. The company actively protect forests with restoration and conservation efforts: in 2015, Enviva’s sponsor created the Enviva Forest Conservation Fund, a $5 million, 10-year program designed to protect and conserve tens of thousands of acres of sensitive bottomland forests in North Carolina and Virginia.

In addition to its sustainability efforts, Enviva brings positive economic impact to rural communities in the Southeast by connecting them to global trade and by providing direct jobs at its facilities and indirect jobs which support its operations.

To learn more about Enviva and sustainably sourced bioenergy, visit

Enviva’s Cottondale, Florida facility which produces 760,000 metric tons of sustainable wood pellets per year
Enviva employees at work

Spotlight: Enterprise Product Partners

Enterprise Product Partners is a leading shipper of shale-produced liquefied petroleum gas (i.e. propane and butane) to emerging economies across the globe, exporting more LPG than any country outside of the US and accounting for 35-45% of total US LPG exports over the past few years. The company currently exports more than 500 thousand barrels per day of LPGs from the Enterprise Hydrocarbons Terminal (EHT), recently completed an expansion that increased EHT export capacity to over 800 thousand barrels per day, and plans to increase capacity to 1.1 million barrels per day by year end 2020. These expansions will give Enterprise the ability to more than double its LPG exports from recent levels and comes at a time when LPG demand is growing globally. 

Enterprise is playing a vital role in advancing the adoption of LPG in India. According to the World Health Organization (WHO), an estimated 800 million people in India are currently forced to use solid fuel, primarily wood and coal, for open fire cooking because they lack access to a clean-fuel cooking alternative like gas or propane. The WHO estimates that there are 1.3 million premature deaths in India each year from household air pollution.

To address the household pollution issue, India’s Modi government introduced the Ujjwala program in 2016 which subsidizes LPG usage to poor households. Their ambitious goal is to provide access to cooking gas to 100% of households by the end of 2019. The government is also expanding the program to make it easier for consumers to replace used LPG tanks for new ones, making the use of LPGs more sustainable and accessible. 

As demand for LPG rises globally, the U.S. provides the lion’s share of LPG to the world. Enterprise’s vision to reduce carbon emissions, its state-of-the-art export facility and advantageous access to the Houston Ship Channel is accelerating the adoption of LPG and the transition to cleaner energy to developing markets.

Enterprise Hydrocarbons Terminal
CO2 equivalent greenhouse gases saved through sustainable investments

Spotlight: ONEOK, Inc.

ONEOK, Inc. is a leading midstream service provider and owner of one of the nation's premier natural gas liquids (NGL) systems, connecting NGL supply in the Mid-Continent, Permian and Rocky Mountain regions with key market centers and an extensive network of natural gas gathering, processing, storage and transportation assets. ONEOK strives to operate a safe, environmentally responsible and sustainable organization.

Some of ONEOK’s environmental accomplishments include:

  • Built natural gas gathering and processing infrastructure in the Williston Basin over the past several years, resulting in decreased flaring of natural gas in the region to 10.5 percent in December 2017 from 35 percent in February 2014, significantly lower than state established gas flaring regulations.
  • Restored habitats of more than 2,500 acres of land affected during large capital construction projects.
  • Reduced total water usage in 2017 at its NGL storage facility in Conway, Kan. by 59% emitting 75 fewer tons of volatile organic compounds (VOCs), compared with 2016.
  • Planted more than 1/3 of the 50,000 trees through North Dakota’s Planting for the Future project.
  • Implemented 10,000 measurement facilities powered by solar energy in the last 15 years.
  • Reduced greenhouse gas emissions at the company’s Overland Pass Pipeline delivery station by 95% percent in 2017 compared to 2016, following the installation of specialized equipment.
  • Established an independent environment, safety and health (ESH) team to focus on its environmental sustainability program. The ESH team promotes sustainable practices and awareness into the company’s business planning and operational processes.

ONEOK has received several recognitions for its sustainability efforts including:

  • Ranked in the top 20% of companies in the U.S. and Canada energy sector carbon disclosure project rankings.
  • Listed by Newsweek magazine’s 2017 Green Rankings of the 500 largest publicly traded U.S. and global companies for overall environmental performance, strategies and reputation among environmental experts. These rankings assess the core principles of transparency, objectivity, public data, comparability and engagement.
  • Earned Kansas Department of Health and Environment's 2017 Pollution Prevention (P2) Award for an ongoing compressor station consolidation project. The P2 Award recognizes projects that eliminate or reduce the generation of pollutants or wastes at the source, or projects that conserve natural resources. This project reduced ONEOK’s environmental footprint per year by approximately 160 tons of nitrogen oxides, 191 tons of carbon monoxide, 12.4 tons of VOCs and 0.1 ton per of sulfur dioxide.
  • Presented the 2017 Environmental Federation of Oklahoma Frank Condon Environmental Excellence Award, for an innovative, voluntary and effective environmental program.
  • Inclusion in the FTSE4Good 2018 Index for meeting its stringent ESG criteria.
Construction of Elk Creek pipeline
Canadian Valley Natural Gas Processing Plant in Calumet, Oklahoma.