The costs associated with setting-up the Bank as a separate institution, such as procuring new IT systems, make it a more costly option than alternatives such as extending the remit of existing bodies.31 The Bank told us it is working towards a “triple bottom line”, consisting of its two policy objectives—helping to tackle climate change and aiding regional growth; alongside two financial objectives—generating a financial return and “crowding-in” additional private investment.32 The Treasury set the Bank a target to earn an annual return on equity between 2.5% and 4% by 2025–26. It also told us that it has set the Bank a target to attract additional private finance of £18 billion.33 The Bank told us that “to be additional every time we invest”, that “additionality is a judgement” and that there are many ways the Bank can be additional. The Bank explained that it can be additional by filling financing gaps or taking risks, including policy risk, that the private sector is unwilling to accept. The Treasury told us that “but it is not there just to get as much money out the door as it can. It is there to do the things that are truly additional.” The Bank told us that it “can look to be additional to all those market moments by working with the government departments, understanding the private market appetite and then figuring out what we think our intervention is”, but that it has “not got there yet”.34