UK GAS-Prices fall on lower demand, high storage levels.

June 26 (Reuters) - British wholesale gas prices fell on Wednesday due to a drop in demand for power generation from gas turbines and as storage levels are high.

* The July contract continued its decline and fell by 0.73 pence to 24.25 pence per therm by 0843 GMT, its lowest since September 2009.

* Britain's day-ahead gas price fell by 0.20 pence to 25.00 pence per therm, nearing its lowest since September 2016.

* Within-day gas price dropped by 0.25 pence to 25.00 p per therm.

* Declining gas-to-power demand and high gas storage levels led the price drop, Refinitiv analyst Marina Tsygankova said.

* "Νominations and our model indicate (a) small reduction in gas for power demand today, which is more than offset by 9 million cubic metres (mcm) per day of injections nominations compared to 3 mcm/d of withdrawals yesterday," she said.

* The gas system was balanced, with demand expected at 177.3 mcm and supply at 178.1 mcm per day, National Grid data showed.

* On Wednesday Britain's total imports from Norway are expected at 74 mcm, just 2 mcm short of Tuesday's levels.

* Norwegian flows to Britain are expected to increase next week due to the end of maintenance at the Troll gas field.

* Average daily temperatures in Britain are forecast to reach 16.0 degrees Celsius on Wednesday and are seen falling to 15.3C on Thursday.

* Wind generation in Britain is forecast to rise slightly to 4.6 gigawatts (GW) on Thursday from 4.5 GW on Wednesday, Elexon data shows. Total UK wind capacity is 12.1 GW.

* Two Qatari liquefied natural gas (LNG) cargoes are expected in Britain by July 15.

* Day-ahead gas price at the Dutch TTF hub up by 0.17 euro at 9.30 euros per megawatt hour (MWh).

* Benchmark Dec-19 EU carbon contract was up by 0.40 euro at 26.81 euros per tonne. (Reporting by Lefteris Karagiannopoulos in Oslo Editing by Edmund Blair)