2020 Sustainability Report |As clear as water. Sustainable and transparent governance | 51 Bestpractices Strategic alliances between suppliers and Aqualia Renewable energy Contracts with purchase and sale special employment agreement with Alpiq AG centres Aqualia was the first companyIn 2020, contracts for cleaning in Spain specialising in thein work centres were made via management of the end-to-special employment centres in 297 end water cycle to sign a long-municipalities in Spain. term renewable energy purchase and sale agreement (PPA, Power 297 Purchase Agreement, in English). The agreement was signed withthe Swiss company Alpiq AG,for a period of 10 years and municipalitise a consumption of 76 GWh per year (equivalent to requirements for 20,000 households).