Multilateral funding agency ADB on Monday said it proposes to subscribe non-convertible debentures worth Rs 150 crore of Tata Power Delhi Distribution Ltd (TPDDL), to enhance Delhi’s power distribution through grid enhancements. Besides, Asian Development Bank (ADB) agreed to provide $2 million grant to partially finance the purchase and integration of a pilot battery energy storage system (BESS), a statement by Manila-based funding institution said.