Poyry Consulting have issued a report on the impact of shale gas exploitation across Europe, considering what happens if we do a bit of it or a lot of it. They say things like this:

In the Some Shale Scenario, net employment increases by 0.4 million by 2035 and 0.6 million by 2050. In the Shale Boom Scenario, net employment increases by 0.8 million jobs by 2035 and 1.1 million jobs by 2050.

A million jobs by 2050 sounds pretty good to me

As does this:

Household spending on energy costs by 2050 could be lower by up to 8% in the Some Shale Scenario and by up to 11% in the Shale Boom Scenario, when compared to the No Shale Scenario. Over the period 2020 - 2050 total cumulative savings could be €245bn in the Some Shale Scenario and €540bn in the Shale Boom Scenario.