UK residential smart meter manufacturer EDMI is planning to change the RF module to enable operation on 868 MHz as well as 2.4 GHz. 

The redesign was triggered in 2014, according to a source familiar with the matter, after Data and Communications Company (DCC), the Capita subsidiary managing the UK-wide smart meter project on behalf of government, found a dedicated Zigbee wireless home area network (HAN) using 2.4GHz alone would not allow smart meters to work properly in every UK home.

The  upgrade is expected to cost £6.98 million and take 18 months.

Full Story - https://www.theregister.co.uk/2017/03/02/edmi_doubling_smart_meter_cost_consumers/