Located in Brussels, the EFTA Surveillance Authority (ESA) ensures that Iceland, Liechtenstein and Norway respect their obligations under the EEA Agreement in the same way that the EU Member States are supervised by the European Commission. It also ensures that enterprises in these countries abide by the rules relating to effective competition. ESA can investigate possible infringements of EEA provisions, either on its own initiative, or on the basis of complaints. ESA maintains close contact and cooperates frequently with the Commission.
Read more about ESA on its webpage: www.eftasurv.int
For ESA's legal background documents, see here.