THE coalition government has signalled its intention to direct the Green Investment Bank's fund towards investment in low-carbon technology. The Institution of Engineering and Technology, however, believes the bank should also support energy efficiency innovations in the manufacturing sector. The investment mandate for the bank is to deliver the government's aims on economic growth, facilitate the transition to a green economy and support Britain's industrial transformation. Much of the focus to date has been on investment in the manufacture of low-carbon goods and the rollout of green infrastructure.  Energy conservation and efficiency should be among the priorities of a sustainable energy policy. Energy is set to become increasingly costly and, to survive in the global market, British firms will not only need to produce new products but produce them at competitive prices. This means driving down costs.  The manufacture of low-carbon technology is often seen as a panacea to meet Britain's carbon reduction requirements while at the same time creating a renaissance in manufacturing. Yet the manufacture of low-carbon goods is not in itself automatically green. a green industrial revolution should first focus on greening manufacturing processes to reduce energy and resource use.  For Britain to achieve its targets on carbon emissions, there needs to be extra support for green manufacturing processes. Energy conservation and efficiency in the manufacturing sector should be a priority for the government.  In addition, access to the Green Investment Bank for small and medium-sized companies will be paramount.  Smaller companies are able to develop and commercialise products rapidly in niche areas. They should have priority access to the Green Investment Bank to spur green growth and technology.  Tony Whitehead Institution of Engineering and Technology London WC2