High Pressure!

The Pressurizer is a new multiblock made of titanium that can turn water into HP (high pressure) water, steam into HP steam, and the other way around.

Once you have access to HP water, you can use a High Pressure Large Steam Boiler to produce HP steam.

One millibucket of HP steam is worth 8 mb of regular steam, that is 8 EU.

A Large Steam Turbine will accept both regular steam (1 mb = 1 EU) and HP steam (1 mb = 8 EU) into EU, and will generate up to 16384 EU/t! However it will not give you back regular nor HP water.

Remember that pressurizing water into HP water costs a lot of energy, but the turbine will not give it back! You can use a Heat Exchanger to recover the HP water for another cycle.

Another option for small setups is to use an HV steam turbine. Like other HV generators, it will produce 512 EU/t. This one will only accept regular steam.