In pursuit of a complete failure to understand the problems with its own 'capacity market' Ofgem seems about to make things a whole lot worse by reducing capacity margins - by taking away the incentives to a lot of small scale generators whose existence helps to keep the electricity sector running.
Ofgem runs on a piece of fantasy theory that the capacity market will work better if the 'distorting' benefits to so-called 'embedded;' generators are taken away. In fact the opposite it the case. Ofgem's concern that proposed big gas power stations cannot win bids at sufficiently low prices to put them into business partly because of the small generators is total nonsense. Without the small generators the price at which the required capacity will be supplied by the big power stations will increase not fall. The problem has to do with the principles and practice of the capacity market, and has nothing to do with the small generators who currently provide a valuable service. Ofgem's actions are akin to destroying a table leg in order to save the table.
The central problem is that future prices for electricity that the power stations could sell on the wholesale power markets are very uncertain, and quite likely to fall. Given this it will require very high capacity market prices (which will put consumer energy bills up by large amounts) to evince the capacity that Ofgem wants from gas fired power stations.
A big part of the problem of course is that increasing parts of electricity supply are being paid for outside of the wholesale power markets, through the Renewables Obligation or contracts for difference. This will only increase in the future, especially if Hinkley C comes on line (whenever that may be). Note: this has nothing to do with so-called renewables 'intermittency' , it is to do with 'liquidity' being siphoned away from the wholeslae power markets to pay for low carbon energy sources - which has to be done of course, otherwise they will not come on line.
The answer to all of this is to offer new generators firm long term contracts so that they can have income guarantees in the future - this may involve some sort of 'take or pay' scheme for all generators at least, in the form of a contracts for difference arrangement as applied to the generators. - But this approach is bound to end up being a lot cheaper than the Government's current approach which consists on the one hand of giving the capacity payments to every generator and on the other hand (in these proposals) of driving the small generators out of business by taking away the income they need to provide capacity to the whole of the system.
The problem has a lot to do with ideology. Ofgem and civil servants seriously believe that somehow in a world of decarbonisation you can run wholesale power markets according to some imaginary free market trading arrangement. People must learn to be more pragmatic and tear themselves away from economic models that have little bearing on the real world.
For the story on Ofgem's proposals see http://www.telegraph.co.uk/business/2016/09/24/industry-faces-160m-energy-hit-under-overhaul-of-power-plant-rul/