By our Engineering Correspondent
You may have heard the local Labour and Green parties, followed by our esteemed Mayor, making very public declarations about their plans to make Bristol Carbon Neutral in the coming decade. Very sensible given the recent UN statement that we only have twelve years to avoid climate catastrophe … And counting.

They’ve talked the talk, now they’ve got a chance to walk the walk. With Bristol’s very own ‘Tidal Lagoon’, a term actually used by the Green party. Although it’s usually called the ‘Floating Harbour’. In January the Mayor, Labour, and all Green Councillors were mailed, pointing out the unequalled opportunity to generate significant amounts of carbon neutral electricity at minimal cost, from Bristol’s water system.

You can think of the harbour as a tidal lagoon, in which case it’s got the highest tidal range, at its gates, in a city, in the world. Two massive surges every day. Or you can look at it as a simple reservoir and dam, fed by two rivers, both used historically for power generation.

Actually, it’s both. With a flood control outlet (at Tesco on the M32) that leads via a straight tunnel to Sea Mills. It’s difficult to imagine a better set-up for water-based power generation. Every weir, from the main inlet at the Netham on the Avon and Snuff Mills on the Frome, right down to the Underfall Yard and Sea Mills flood control outlets, are capable of making useful power.

Unlike the Swansea tidal lagoon scheme, the entire infrastructure already exists. All the dams, weirs and flood control features are in place. Some have been there for over a century. Literally all that’s needed is the installation of appropriate turbines, themselves stock production items already in use all over Europe.

First step is the not hugely expensive job of producing a map of the whole water system, including details of all the potential power generation points.  This map can be taken to European water power specialists, currently being contacted, to get an accurate estimate of potential outputs and costs. If Bristol doesn’t have this data it will be compiled from Google Maps plus photos and video. Then it’s decision time. Given satisfactory figures and effective management (executive ‘action this day’) it would be feasible to have power coming out of the easiest installations this year.

Response so far?  Zero. Nada. They’ll all be mailed again In March (eleven years and nine months…) It’s not totally surprising. BCC is an institution and the first instinct of all institutions is to ignore inputs from outside. But they don’t really have that option. This is an emergency. All solutions must be considered. Bristol City has to step up to the plate, if nothing else for their revolting children.

This is where we find out if our glorious leaders Can Do, or are just useless politicians.

Watch this space.