These savings will be delivered through the implementation of cost-effective measures such as high efficiency motors, variable speed drivers, energy efficient boilers, improved energy management systems and process optimisation. Government is required to review targets set under CCA every 7 years, in order to ensure that targets reflect the full potential for energy efficiency improvements or carbon savings taking into account of any changes in technical or market circumstances. It is estimated that CCAs in pigs, poultry meat, eggs and covered horticulture achieved energy savings of up to 40% have been achieved when compared to their base year energy use in 2000/2001 (DEFRA, 2013a). Some claimed that that the Agreements were effective in focusing managerial attention on energy efficiency, while others have cast serious doubt on their efficacy.