Generator Retrofit

You must provide much more information as we cannot provide even broad answers with what you have supplied (especially given the specialised and dangerous nature of your application).

What type of generator, what manufacturer, what technology?

Are you replacing it, retrofitting a manufacturers upgrade kit to get more capacity, overrunning your existing generator by 17%, etc?

Please provide much more information on your application.

I've had many experiences over the years. Which ones do you want to discuss?

I've never uprated, "a 60MW generator to 70MW", and neither have you, apparently.

Get some professional help!

This is being regularly done and successfully too. I am aware of not only 60 but 100 (to 120MW), 180 to 200/210MW being carried out.

But the system is not that simple. You have to go through a lot of work from the boiler (assuming you are on Steam Turbine Generator) - to Turbine too. In fact the whole SG and TG packages will need tinkering/ modification/replacements.

Get hold of consultant and suppliers and let the study your plant. Some equipmets will have enough margin to handle the extra power some won't.

as per your question :Experience - technically feasible. Economical? to study and find out.

Thanks for those assuring comments, I am in the process of acquiring plant specific data to analyze. Do you know any consultant or book which could be use to extract info. The generator is an ABB american design and the turbine is already upgraded to generate the power need.

Contact the OEM of the generator and discuss it with them. There might even be a trade-in value to discuss, that might reduce the outlay on the 70MW one, perhaps?

PWS is right. Since we have done only with our own equipments, and the whole project was without consultants. We were approached by our customers and we have executed the total package.

I am not sure that we will not be able to do the same for the Generator for you, but why to take the risk, when ABB will do it, most likely at a reasonable charge. We always prefer the things left to OEM sine they are the one that have desgined the equipment and hence will know the equipment corrections require (BTW we didn't have to struggle much at generators since our generators, new ones, generate a power even higher than that, our 500MWs regularly touch 525-550MW 60MWs I have personally seen running at 70-75MW) , hence what was required by us was to just rejuvenate the old one, and that helped, since the budget for the whole project was fixed by customer. But for your case it is ABB that can answer.