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2. APS, 2012. 2012 Integrated Resoruce Plan. Arizona Public Service Company. 〈http://www.aps.com/_files/various/ResourceAlt/2012ResourcePlan.pdf〉.
3. Survey of Utility Resource Planning and Procurement Practices for Application to Long-Term Procurement Planning in California;Aspen/E3,2008
4. Avista, 2011. Electric Integrated Resource Plan. Avista Corporation. 〈http://www.avistautilities.com/inside/resources/irp/pages/default.aspx〉.
5. The Future of Utility Customer-Funded Energy Efficiency Programs in the United States: Projected Spending and Savings to 2025;Barbose,2013