American Wind Energy Asociation- advocates the development of wind energy as a reliable, environmentally superior energy alternative in the United States and around the world.

The Association for the Conservation of Energy - exists to reduce overall energy demand to ensure a secure and sustainable energy future.

Biofuelwatch - highlight the environmental impacts of the global biofuel market and campaign for regulation to ensure only sustainably-sourced biofuels can be sold in the EU.

British Photovoltaic Association - formed to advance the development and use of photovoltaics (solar electricity), promoting the use of PV within the UK as well as other regions such as Africa, Asia and Latin America.

British Wind Energy Association - promoting excellence in wind energy research, development and deployment.

Carbon Balanced - assistance to businesses and people in reducing emissions

Carbon Trust - helps organisations of all sizes to cut their energy bills with practical advice, free publications, interest free loans, and on-site surveys.

Centre for Alternative Technology - investigation, use, demonstration and promotion of environmentally and socially appropriate technologies for energy generation /conservation, food production and building design.

Centre for Research, Education and Training in Energy - not for profit education organisation promoting energy efficiency and sustainable development

Combined Heat and Power Association - works to promote the wider use of combined heat and power and community heating.

Creative Environmental Networks - delivering a range of services to engage householders, businesses and communities in environmental and social improvement.

Dynamic Demand - established by independent academics, campaigners and engineers dedicated to investigating new solutions to the challenges of climate change

Efficient Power Systems - designer, manufacturer and distributor of energy efficient products.

Energy Bulletin - focused primarily on peak oil, also covers climate change, alternative energy & sustainability issues.

The Energy Saving Trust - promoting the efficient use of energy in the UK

Energy-server.com - platform for renewable energy and energy-efficient construction

Energy 21 - "Uniting Action for Renewable Energy".

Fuel Cells - the online fuel cell information resource. Fuel Cells 2000 is formed to promote the development and early commercialization of fuel cells and related pollution-free, efficient energy generation, storage and utilization technologies and fuels.

Green Dragon Energy- solar & wind-powered electrical systems

Green-e - independent renewable energy certification and verification program.

Home Power- is a magazine, the hands-on journal of home-made power.

I - Volv - recruitment consultancy providing personnel to organisations throughout Environmental, Renewable Energy and Water sectors

The Institute of Energy - professional body for the energy industries, providing expertise in energy matters, creating a home for energy professionals and a scientific and technical reservoir for industry.

Klimaschutzaktion nordlicht - campaign for climate protection by energy saving and traffic reduction

Light Pollution Campaign - BAA campaign for dark skies

Marches Energy Agency- charity promoting and encouraging energy efficiency and renewable energy throughout Herefordshire, Shropshire and Worcestershire

Micropower Council - promoting the small-scale generation of sustainable energy

The National Energy Foundation - mobilises individuals, businesses and communities to make their contribution to reducing carbon emissions through energy efficiency and use of sustainable energy sources

Oil Depletion Analysis Centre -educational charity raising international public awareness and promote better understanding of the world's oil-depletion problem.

The Pembina Institute - working on climate change policy and solutions.

Positive Power- building an online alternative energy community providing free and impartial information about renewable energy and sustainable living..

Powerwatch Network - detailed information and campaign advice for people concerned about the health and environmental impacts of electromagnetic fields, including pylons, phone mast and mobile phones.

Renewable Energy OPET - [EC] Organisation for the Promotion of Energy Technology

Renewable Power Association - represents British renewable energy producers and promotes the use of sustainable energy in the UK.

SolarCooking - information on building, buying and all things solar cooking

Sunspot - using the energy provided by the sun for cooking. Includes the Solar Cooking Archive - links for solar cooking.

TVEC - aim is to achieve carbon reductions in the Thames Valley region and beyond through the application of energy efficiency and renewable technology

uk-energy-saving.com - The UK Energy Saving website gives information and tips on ways to save energy and
also how to save money on household bills.

Vestas Wind Systems- leader in wind technology and a driving force in the development of the wind power industry.

World Energy Council - promote development and the peaceful use of energy resources to the greatest benefit of all, both nationally and internationally, by considering the potential resources and all means of production, transportation and utilisation of energy.

World Renewable Energy Network- a worldwide forum for discussing the best means of implementing renewable energy.

Green Electricity Suppliers UK

Eco Energy - electricity from non-polluting renewable sources.

Ecotricity - take the money customers spend on electricity and invest it in clean forms of power like wind energy

Good Energy - provide simple solutions to people and businesses that want to reduce their impact on climate change by reducing their carbon dioxide emissions.

Green energy UK - offering people who are concerned about the environment the chance to do something positive