gas, nuclear and co-generation plants located in 40 countries, mainly in Europe, North America and Latin America. Output in Spain: 58,076 GWh in 2013, of which 14,795 GWh were produced at hydroelectric plants. As a result, 79% of Iberdrola's production in Spain was emission free. Regulated business Iberdrola provides service to more than 32.26 million people. In Spain has over 10.91 million supply points and a total distributed energy of 92,676 GWh. The TIEPI indicator for supply quality has been situated at a value of 61.8 minutes (2015). In the United Kingdom, the affiliate for the ScottishPower Group has over 3.51 million distribution clients. The volume of energy distributed has been 36.213 GWh. In the United States, Avangrid has 2.2 million power supply points of electricity and 0.99 million of gas. The volume of energy distributed has been 31.337 GWh. In Brazil, Iberdrola has distributed a total of 29.941 GWh in 2015. The number of customers has been 13.1 million. Renewable energy business In Q1 2021, Iberdrola reported having operating installed capacity of 55,396 MW producing a total of 42,951 GWh of electricity in the year. Its clean energy capacity increased by 13.3% to 79%. Main subsidiaries ScottishPower The UK's 4th largest energy provider, ScottishPower has 5.79 million customers across the country and 7,380 employees. It has generation assets in hydro, coal, combined cycle gas and cogeneration, as well as a distribution network covering 65,000 km of underground cables and 47,000 km of overhead lines. ScottishPower is involved in smart grid projects in Glasgow and Liverpool, and provides charging points as a member of the Glasgow consortium which is developing an electric vehicles project. The installed capacity in the United Kingdom has reached 6,342 MW and production has been 19,936 GWh in 2013. Iberdrola USA Iberdrola USA, which became part of the group in September 2008, distributes electricity and gas to 2.44 million customers in the states of Maine and New York. It has offices located in its principal distribution centres in the two states. In New York, the business is shared by two operating subsidiaries – New York State Electric & Gas (NYSEG) and Rochester Gas and Electric (RG&E) – both headquartered in Rochester. In Maine, Central Maine Power (CMP) has headquarters in Augusta. NYSEG serves 878,000 electricity customers and 261,000 natural gas customers across more than 40% of upstate New York, whereas RG&E serves 367,000 electricity customers and