by Ecotricity to customers came from nuclear sources. This proportion had decreased to 16% by 2010, and 2.6% by 2011. Ecotricity also provided a 100% renewable energy tariff called New Energy Plus, in which renewable energy was bought in from other suppliers to top up renewable energy produced by Ecotricity. Wind In Conisholme in Lincolnshire on 8 January 2009 two of the blades of one of the company's turbines were damaged. In February 2013 the go-ahead was given for Ecotricity to build its largest windfarm, a 66 megawatt, 22 turbine farm at Heckington Fen in Lincolnshire In February 2013 Ecotricity revealed a prototype 6 kW vertical axis wind turbine called the "urbine". Solar Ecotricity also produces solar energy, with its first "sun park" opening in 2011. In April 2016 it bought SunEdison's UK business supplying domestic solar panels. Gas From May 2010 it became the first UK company to supply eco-friendly gas, produced in the Netherlands by anaerobic digestion of sugar beet waste and in 2015 it was planning to have its own digesters fed by locally sourced grass from marginal land of grade 3 or poorer by 2017. The first of these would have produced 78.8GWh a year from 75,000t of grass and forage rye silage. In August 2015 Ecotricity announced plans to build an anaerobic digester at Sparsholt College in Hampshire that would take grasscuttings from local farms and supply the resulting six megawatts of gas to the grid with the overall aim of training students in the technology. This joined the first announced in Gloucestershire in April and was followed by a third three megawatt plant announced in August in Somerset. On 25 April 2016 planning permission for the site at Sparsholt College was refused. In July 2016, a new application was made to build the facility at the college site, which was approved in October 2016. The new proposal included "[...] new and revised traffic data and assessment, new traffic plans to keep vehicle movements away from Sparsholt village and a commitment to protect local road infrastructure.". Also, "[Ecotricity] consulted representatives of the nearby parish councils and incorporated their requests, wherever possible into the routing plans and operational controls." By the start of 2019 the company had not built any biogas plants but still intended to do so. Microtricity feed-in tariff Ecotricity offers the Feed-in Tariff as a voluntary licensee under the name "Microtricity", offering payments