National Grid Gas could not be expected to have known about the soil type, the report said.
BBC: Shrewsbury gas explosion 'no-one's fault' HSE concludes
"HSE's investigation has concluded that National Grid Gas have correctly applied their gas mains maintenance procedures in relation to the low pressure main located at 1-5 Bridge Street, " the report said.
BBC: Shrewsbury gas explosion 'no-one's fault' HSE concludes
It is believed to be the first of its kind in the UK to feed biogas directly into the national gas grid.
In Germany biogas is already being fed into into the national gas grid and in Sweden and Spain, vehicles including buses are run on biogas, but they still use an awful lot of oil overall and most of the small number of gas-powered vehicles are run on petroleum-gas.
FORBES: U.K. Joins Europe On Biogas 'Waste Into Energy' Strategy
National Grid operates the UK's national electricity and gas grids, as well as four of the country's eight regional gas distribution networks.
Research from the National Grid released ahead of the review showed gas supplies could be even tighter this winter as import facilities remain unfinished and information on supply and demand from the continent remain unclear.
However, the National Grid has said there is "plenty of gas available", and the Department of Energy and Climate Change has said gas needs are being met.
The National Grid, which would normally deal with up to 10, 000 calls a day to its gas emergency phone line, had received more than 100, 000 calls by 14:00 GMT.
BBC: Foul smell complaints in southern England after gas leak
National Grid, which distributes energy, gave warning for the first time that there might not be enough gas to go round and some big industrial users had to cut production.
Already Jenkins has been doing some basic (by gas or electricity standards) arbitrage plays such as contracting for capacity at known chokepoints in the national telecommunications grid to take advantage of price spikes, as well as selling short in areas with a looming glut.
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