Brattle experts were engaged by the Australian Pipeline Industry Association and the Dampier to Bunbury pipeline to prepare reports on how regulators in various jurisdictions around the world use different models and market information to set the cost of equity and debt for regulated utilities, and to make recommendations for the development of guidelines by Australian regulators under the newly-adopted National Gas and Electricity Rules. As part of this work, the Brattle team critically assessed the pros and cons of commonly-used methodologies including, but not limited to, the Capital Asset Pricing Model and versions of the Discounted Cash Flow model.