A third major issue is that, while there is a large market for commercial financing of small PPP projects below $50 million in some sectors, there are key structuring and credit enhancement requirements, as well as related sector policy and institutional deficiencies that may deter banks from financing these projects on a larger scale. For example, energy efficient street-lighting and other projects have few commercial banks that carry specific lending products and thus little financing is forthcoming. Therefore, the scale of such projects has perforce remained small as these are currently fully equity financed. While there are scattered efforts to enable credit enhancement of PPP projects through guarantees and other instruments, these are either not well developed enough, not widely available, or not accessible to specific sectors or specifically to small projects per se due to associated rules and guidance that are customized for larger projects. In addition, banks often have smaller limits on debt or also require collateral from smaller investors to the tune of almost 100-150% of the debt, creating an impediment to the development of the market for project finance for small-scale PPP projects in developing countries.