EiP tech seminar notes 7 Nov

7 Nov. These are live notes taken during the second of 2 “technical seminars”  on the London Plan. Caution: there may be mistakes and later we’ll check among those of us, making corrections as necessary. There is a webcast athttps://www.london.gov.uk/media-centre/mayoral”> 

Context for zero carbon

On carbon reduction the presentation seems to focus strongly on new buildings & the reduction of emissions. Starts with Part L of the building regulations. The presentation is at https://www.london.gov.uk/sites/default/files/zero_carbon.pdf

emissions ring

Efficiency in the use of energy comes from windows, insulation, improved heating, cooling, lighting.  Draft London Plan sets targets of 10% and 15% improvement relative to Building regs (residential / non-residential).  Based on studies by Bureau Hapold of referable (to Mayor) schemes; another by AECOM.

Clean & Green parts of strategy SI2 and SI3 which prioritise cleaner energy sources. summary in the presentation and supporting documents.

Monitoring required because the designed performance of a building is usually not achieved in actual operation.

Payments to planning authority for offset is required now for residential and new plan extends it to non-residential. Money ring-fenced for carbon reduction in that borough – often work on the standing stock. These payments require to cover the gap between a development’s achieved reduction and a zero level.

Q from London First: can the 15% be achieved? Answer, broadly yes, though it varies between uses.

Q from M Edwards on standing stock of  buildings. A: this presentation focus on new building, just because the London Plan has powers only for development. There is some link via offset payments which can be used to retrofit old stock.

Q from Kate Gordon (FoE) Offsetting should be a last resort. Answer ??

Energy Masterplans & heat networks

An aim is reducing waste of heat, and making local use of it; managing local networks to make more use of decarbonised energy sources.

heat map

Some questions on the details of all this. Nothing crucial.

What about when energy from network is billed at higher price than conventional boiler? A: we have published survey data on this and there are instances of higher and of lower prices. We shall be monitoring it and very concerned if prices can’t be lower than conventional.

Overheating

There is a whole section on heat island effects, overheating etc.

Whole lifecycle emissions analysis DOES include mineral excavation, demolition, etc etc. Seeking nationally-recognised methodology.

Q: whole life assessment hard to produce at planning application stage. Can it be done at stage 4. A: discuss it at EiP

Q Waugh Thiselton: on a 17-year analysis embodied carbon is 90% of lifetime carbon & how on earth are we going to implement this?  A: ??

Jump in carbon emissions risk: air-source heat pumps are just AC machines. If we flood the city with them to generate low-carbon heat, isn’t there a risk that people switch them all on in summer to keep cool and we loose all the emission-reduction.

Sian Berry: have we ensured that the embodied carbon in buildings being demolished and in the choices with alternatives between refurbishment and demolition. Answer: garbled and hard to follow but seems to be saying that’s not a planning matter. Audience member interjects to say RICS standard energy assessment scheme DOES include energy embodied in demolished buildings – and offers a bonus for retention of previous elements.

[ Very skilled chairing by Rachael Rooney. ]