Efficiency New Brunswick (more formally the Energy Efficiency and Conservation Agency of New Brunswick) is a crown corporation in the Canadian province of New Brunswick responsible for energy efficiency grants to New Brunswickers. The first president and CEO was Elizabeth Weir. In May 2012, Margaret-Ann Blaney resigned her position as Rothesay MLA to assume responsibility as new president and CEO.

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Efficiency New Brunswick was merged into the provincial utility company NB Power in 2015.^[1]