This Act establishes Denmark’s Energy Complaints Board [Energiklagenævnet] as an independent administrative appeal body for energy-related decisions where legislation assigns it jurisdiction. It regulates the Board’s competence, independence, composition, appointment of members, written case-handling procedures, decision-making powers, rejection of unsuitable complaints, limits on review, and special rules for cases concerning renewable energy projects such as wind and solar installations. The Act also requires digital submission and communication for complaints, sets rules on forwarding complaints from the original authority, provides that Board decisions generally cannot be appealed to another administrative authority but may be brought before the courts within six months, and introduces numerous consequential amendments to existing energy, utilities, CO₂, environmental, water, and wastewater legislation.