The current status for domestic scale solar PV systems is as follows:
All systems installed up to and including March 31st 2014, will receive the 14.9p/kWh tariff rate for the full 20-year tariff lifetime.
The export tariff of 4.5 p/kWh remains unchanged.
Tariffs for other technologies are not affected by the current review, but some are already planned to decrease by a modest amount for new systems installed on or after April 1, 2012.
The date of installation for the purposes of determining the tariff is the date on which the FiT supplier (the electricity company) receives a complete FiT application, including MCS certificate supplied by the installer.