About Solar 21
Investing in the global low-carbon economy


Generating renewable energy is an integral part of global energy policy.

Since the Kyoto Protocol came into force in 2005, hundreds of governments around the world have set ambitious climate change and sustainability objectives.

More recently, the Paris Agreement on Climate Change, which came into force in November 2016, focused global efforts on the goal of keeping the global temperature rise this century well below 2 degrees Celsius above pre-industrial levels.

Dramatically reducing harmful emissions is a key way of stabilising global temperatures. This has led to a movement away from fossil fuels.

To meet this common objective, national governments have implemented incentive schemes to encourage investment in renewable energy production. Now well established, these schemes have gone a long way to meeting emissions targets.

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Track Record

Solar 21 has been delivering steady returns to investors since 2011. The plants in our original solar photovoltaic (PV) portfolio are located in Italy where producers are paid a feed-in tariff per unit of solar energy produced, thanks to the commitment of consecutive Italian governments to renewable energy. Our solar portfolio continues to achieve excellent results due to careful asset management. Following a programme of inverter revamping in 2017, we undertook to replace defective solar modules in 2018 ensuring optimum productivity over time. Discover more about our solar assets here.

In 2015, Biomass 21 was born when Solar 21 acquired the majority and controlling stake of the shares in GB-Bio Ltd, a UK-registered company formed for the construction of the 22MW Tansterne Advanced Biomass plant near Hull, UK. The plant was awarded Best Renewables Project or Installation at the Humber Renewable Awards in 2017, beating Enrolled Freeman of Grimsby and Crown Paints, the other finalists in the category. The plant was commissioned in February 2018 when the G59 Certificate was received by the Northern Power Grid. Read more about Tansterne here.

The expertise and experience we have gained from our solar and biomass projects is now being channeled into the development of a number of commercial-scale anaerobic digestion plants for the production of biogas. Read about our biogas projects here.

Responding the the refuse crisis in the UK, Solar 21 is developing a 23MW Energy-from-Waste plant at Melton and has additional EfW projects in the pipeline.

Our current pipeline of projects will bring this to €2.2 billion over the next five years. View Solar 21 Timeline


Solar 21 was established in 2010 to invest in renewable energy projects, taking advantage of government renewable energy incentives and delivering excellent returns for its investors. With our carefully selected projects, we give our investors the chance to play a part in the mitigation of climate change.  

Solar 21 staff collage


At Solar 21, we believe in working with the best. We partner with experienced professional firms with decades of expertise in planning, legal, engineering and project management.

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Giving Back

Travelling the Wild Atlantic Way in an Electric Car

We’ve supported many different projects here at Solar 21 from Portmarnock soccer team to Hull RUFC, from Achill Musical Society to Barnardos. This autumn we’ve been getting behind an unusual project that, when you look under the bonnet, is quite a good fit for our philosophy. In search of sustainability on the Wild Atlantic Way …read more

Giving back: supporting community initiatives in Achill

As a company, we believe in doing good beyond our environmental mission. For this reason, we’re committed to supporting a wide range of charities and community initiatives, particularly those which have a special resonance in the Solar 21 story. Solar 21 co-founders, Michael and Andrew Bradley, spent their earliest years on Achill Island: “We grew …read more

A Christmas message from Solar 21

As 2018 comes to an end, we wanted to take a moment to wish you a very Happy Christmas and a wonderful New Year. It’s been a very busy year at Solar 21. We recently published our Q4 newsletter which contains all the latest news about our renewable energy projects as well as our corporate …read more

Going green in our Rathcoole Office

As a company, we believe in doing good beyond our environmental mission. As a company, we’re focused on renewable energy. Collectively, our projects reduce carbon emissions by 282,000 tonnes of C02 every year. That’s the equivalent of taking more than 60,000 cars (each travelling an average of 11,000 miles) off the road for a year! …read more

Solar 21 flag summits Mount Bonete with Derek Mahon

We are proud to have sponsored Derek Mahon of Tara Financial Partners in his latest bid to conquer the seven highest peaks in the world and to raise awareness of mental health issues. As part of the elite group of climbers to have successfully summited Everest in 2014, Derek took on his latest challenge this year, travelling …read more

Nollaig Shona Dhuit from all of us at Solar 21

We would like to wish you a Merry Christmas and a Happy New Year. This year, in lieu of gifts, we have donated to Focus Ireland. We hope that we can help this great organisation give the gift of Christmas to people in need across Ireland.

Getting Involved

The company and staff regularly get involved in supporting local and national charities. We have really enjoyed wearing our Christmas jumpers for Our Lady’s Children’s Hospital Crumlin and donating to St Vincent de Paul, St. Colman’s Care Home in Achill, among others.

Portmarnock AFC

Since 2014, Solar 21 has sponsored the jerseys of the senior team at Portmarnock AFC, a completely amateur soccer club. The senior team has achieved three consecutive promotions and is now in the top division of the FAI Leinster Senior League in which League of Ireland and non-League teams play.

Brian Tiernan, Athlete

Senior Analyst Brian Tiernan leads a double life. By day he assesses opportunities in renewable energy for Solar 21, by night (and early morning and weekends) he is training for an Ironman event in Italy this September. The event, which takes place around Cervia in the Emiglia Romagna region of Italy, will be a feat …read more

Baking for Temple Street Children’s Hospital

Solar 21 staff regularly take part in events to raise much needed funds for charities close to our hearts.  The bake sale for Temple Street Children’s Hospital is a great cause and enjoyed by all.

SOLAR 21 Park – Mayo Football League’s headquarters get a new name

Milebush Park, headquarters of the Mayo Football League, will be known as Solar 21 Park, thanks to a sponsorship arrangement unveiled at a gala event in Castlebar on Saturday 21st January. At the gala, Michael Bradley said, “Solar 21 is proud to be associated with the Mayo Football League, one of the most progressive football …read more

Solar 21 Sponsors Hull RUFC

Solar 21 is delighted to sponsor Hull RUFC in this, its 25th anniversary season. Hull plays in National League 3 North which is made up of the fourteen teams from across northern England. It is the highest regional rugby union league in the north of England. Hull RUFC’s home is the Ferens Ground. Hull RUFC …read more

To truly transform our economy, protect our security, and save our planet from climate change, we need to ultimately make clean, renewable energy the profitable kind of energy.

BARACK OBAMA, Address to Joint Session of Congress, Feb. 24, 2009

Memberships and Awards