We transform how unavoidable food waste is managed by providing a full-service solution that is lower cost, less polluting and 100% recycled


Our story

The inspiration for OWL is backed by over 50 years of experience in the energy and waste industries.

Over the course of their careers, our founders have worked with virtually every commercially viable energy source, the past 15 years dedicated to renewable and green technologies.

In the UK, anaerobic digestion plants are struggling to meet their feed stock requirements. At the same time, in the UK alone, over 12 million tonnes of food waste is sent to land fill or incineration every year. OWL was formed to address this fundamental misuse of resources and mistreatment of our planet.

Finding a solution

We set out to find a solution – a practical solution that would allow businesses that create unavoidable food waste to be environmentally conscious without additional operating costs. But, the OWL team did not stop there.

We designed a system that offers savings without upfront capital investment and guarantees 100% recycling of your organic waste.

OWL is leveraging the power of new, proprietary, waste processing technology to provide a fully managed solution to this immense environmental challenge.

We manage all aspects of your business’s unavoidable commercial food waste, from the point where the food waste is created, right through to its conversion into renewable energy and organic fertiliser.

The Founders

William Heller

Chief Executive


Willie has over 30 years of experience in both conventional and renewable energy.


Mat Stewart

Managing Director


Mat brings over 20 years of waste management and recycling experience to the organisation.


‘Over 12 million tonnes of food waste is sent to land fill or incineration every year.’


William Heller
Chief Executive and Co-Founder

Willie has over 30 years of experience in both conventional and renewable energy. Prior to co-founding Organic Waste Logistics, he was Chief Executive Officer of Tamar Energy, the UK’s largest anaerobic digestion company, where he focused on constructing new plants, plant operations and feedstock acquisition.

Previously, Willie was Chief Executive and founder of Falck Renewables Wind and developed over 700 MW of projects across Europe. Under his leadership the company became the largest independent wind power developer in the UK.

From 1996 to 2002, Willie held several senior management positions with Edison International and its subsidiaries, including Chief Executive of Edison Mission Energy, and Senior Vice President of Edison International.

He began his career with McKinsey & Company as a consultant in the energy practice in Houston. He worked in the firm’s London office as Partner and, later in Los Angeles as Partner and Energy Practice Leader. Willie holds a B.Com, Finance (Hons) from McGill University and an MBA from Harvard Business School.

Willie currently serves on the following boards:

  • Board of Directors,
    ADBA (Anaerobic Digestion and Bioresources Association)
  • President’s International Advisory Board,
    McGill University
  • Faculty Advisory Board,
    Desautels Faculty of Management, McGill University

Mat Stewart
Managing Director and Co-Founder

As Co-founder of Organic Waste Logistics, Mat brings over 20 years of waste management and recycling experience to the organisation. He was previously Director of Feedstock and Plant Operations at Tamar Energy where he focused on optimizing plant production.

Prior to Tamar, Mat was Managing Director of the waste management company, Countrystyle Group, where he achieved dramatic growth through acquisitions and internal expansion. There he oversaw the successful bidding process and contract mobilization for all waste management services at Spitalfields Market.

From 1996 to 2009 Mat was a Regional Director of Waste Recycling Group (WRG) with responsibility for the operations of: landfill sites, household waste recycling centres, soil recycling plants, leachate treatment plants and waste transfer/recycling stations. During the time that WRG was owned by Terra Firma Capital Partners, Mat was involved in the integration of acquired businesses, acquisitions & mergers, and strategic projects. When the business was sold to FCC Environment, Mat continued in this role until becoming Managing Director of Countrystyle Group.

Mat is highly qualified in the field of waste and resource management. He holds professional competency certifications in road haulage, special landfill and transfer stations. In addition, Mat is a Member of the Chartered Institution of Wastes Management (CIWM).

OWL System Overview

What is it?

The OWL System is a full-service approach to food waste management. Simply tip your food waste caddies or bins into an on-site stainless steel hopper and OWL does the rest. There are no more odours, spills, pests or vermin.

All food waste is removed by OWL in vacuum trucks every two to three weeks, greatly reducing vehicle traffic and your carbon footprint.

OWL delivers your waste to one of the UK’s 150 food waste anaerobic digestion plants, where 100% of it is converted into renewable energy and organic fertiliser.

For a single monthly fee, we provide a full-service solution, including servicing, maintenance and repairs. In addition, our detailed monthly environmental reports promote your sustainability efforts with accreditation organisations and key stakeholders.


Typically, we deliver all of this for less than the cost of your current approach.

What's our technology?

At the heart of our innovative system is the BioWhale, a patented vacuum unit that’s built into a standard steel shipping container. This we install at no cost in the space currently occupied by your waste bins. The BioWhale collects, processes and stores food waste under vacuum until we remove it in vacuum trucks.

The BioWhale is designed and built for OWL by Whale Tankers, the UK’s leading manufacturer of vacuum tankers.

There are three sizes, to suit customers’ food-waste requirements:

  • 1
    Compact: 10 foot, 4,000 litres (4 tonnes of food waste).
  • 2
    Standard: 20 foot, 12,000 litres (12 tonnes of food waste).
  • 3
    Large: 40 foot, 24,000 litres (24 tonnes of food waste).

How does the BioWhale work?

Once your food waste is tipped into the BioWhale via its built-in hopper, waste is first shredded, then ground into a BioSoup. This is slowly mixed, allowing food to break down into glucose, fatty acids and amino acids, without the addition of water or chemicals. In this form, it’s stored under vacuum, odour free, for up to three weeks. No waste or flammable gases are produced.

We monitor storage tank levels online. When full, we dispatch a vacuum tanker to empty the BioWhale at a time convenient to you. Your waste is taken to one of 150 UK food-waste anaerobic digestion plants. There, it is converted into renewable energy and organic fertiliser.

Our monitoring system also tracks BioWhale performance. Any issues are flagged at our control centre and, if necessary, we can dispatch a specialist service vehicle from one of our 14 UK service centres. We also offer a 24/7 rapid response call centre.

Why do you need the Owl system?

... Because you and your stakeholders benefit from a state-of-the-art food waste solution that is fully certified, corporately responsible, and guarantees 100% recycling of your food waste.

The following are among the OWL system’s benefits:

  • It eliminates odours, spills,pests and vermin.
  • Our solution is future-proofed against changing waste legislation and standards – unlike your current system, and other alternatives.
  • There is a single monthly fee and no up-front investment. This is more cost effective than other alternatives.
  • The OWL system ensures all food waste is recycled, instead of going down drains or to landfill or incineration.