Cardiff - One planet city?

WASTE Greenwash

One planet living document states 'We will be turning our waste into energy. Prosiect Gwyrdd will deal with over 40% of South Wales’ waste, turning waste which cannot be recycled or composted into both electricity for the national grid and heat, which can be used in district heating schemes'

False statment and Misleading information. No mention of the INCINERATOR word. Incineration turns waste into toxic ash and atmospheric pollutants (CO2, NOx, particulates and trace toxic metals, dioxins etc.). The approved Viridor incinerator is only 20-22% energy efficient, its heat will be wasted not used in district heating for which cardiff plans zilch.

P Gwyrdd is the most inefficient way to “deal with” municipal waste. Cardiff incontracting PG over 40% of its waste is abandoning policy to maximise recycling – accepted to be much better than incineration in resources, CO2 and ecological footprint.

Cardiff's contract to PG also disregards WG target to reduce waste to 2050 by 1.2% per person pa needed to meet the One Planet target. Cardiff's waste projections assume zero reduction in waste arisings per person, which by 2050 amounts to twice the WG's 'One Planet' waste.

The PGwyrdd Incinerator policy does not fit the 'One Planet' target for the city's municipal waste.

Abandon P Gwyrdd Incinerators

False Viridor claims of zero or even negative carbon

Based on evidence submitted by CATI to the Assembly Petitions Committee, Dec. 2010

The Environment Agency approved the claim in their license determination, but failed to carry out a reality check. The first point is that the energy efficiency is not the 65% assumed by Viridor, but 20-22% for this type of incinerator, after deducting electricity used in the process. Second, Viridor fail to project the decreasing bio-component of municipal waste in future years and the decreasing carbon intensity of the UK el-supply.

Basic figure:

Burning 350kt/year municipal waste would emit 420kt CO2 [1 kt = 1 kilotonne = 1000 tonnes]

Avoided landfill means less methane, counted in equivalent CO2 [called CO2e]

– take as 12% of Wales total (34kt/yr) on basis of Cardiff pop'n => 4 kt CO2e/yr

=> this is less than 1% of 420kt CO2 so negligible.

Wales Waste sector total CO2e is 1.3Mt CO2e/yr (2007 fig.**) so Viridor’s 420kt adds 33%.

# The fraction of bio-carbon is waste is 50% now, projected to decrease to ~35% by 2018:

=> Viridor's emissions of 'fossil' (non-bio) CO2 is 28kt pa – which adds 20% to the 1.3Mt

How much Offset for electricity (otherwise generated by large power stations) ?

# 20-22% efficiency => twice CO2 per kWh of the worst 35% efficient coal-power

[calculation per tonne waste 9.5GJ x 21%, 1.2tCO2

per tonne coal 27GJ x 35% per t coal, (80% x 3.75) 3.0t CO2

gives ratio of power per tonne of CO2 1.7 : 3.3GJe/tCO2]

The usual units kWh/kgCO2 – to convert divide by 3.6 => a ratio 0.47 : 0.9 kWh/kg CO2

Next discount 35% of CO2 as bio-carbon (from 2018 according to Defra) and

invert the units => ratio waste incinerator : coal becomes 1400:1100 g fossil-CO2/kWh

The Offset should be calculated not against the worst coal-plant but for average baseload electricity now and into the 2020s, as the UK supply becomes lower in carbon:

# by 2016-17 the UK carbon emissions (Fig. below) are 350 gCO2/kWh, ie. one quarter of Viridor’s

# by the mid 2020s, the UK carbon emissions drop below 140 gCO2/kWh, ie. one tenth of Viridor’s

# by the mid 2020s, all Welsh electricity is to be ‘renewable’ with carbon intensity near zero.

Conclude: from the start (2015) Viridor’s incinerator would be worse (1400 v. 1100) in fossil CO2 emissions than the worst coal-fired plant and nearly 4 times worse than the UK average generation (350 in the Figure)

Viridor’s claims of zero or negative carbon are false; their incinerator would add strongly to Wales greenhouse emissions.

By the mid 2020s, Viridor’s incinerator would be 10 times worse than UK average.

** figures from Greenhouse Gas Inventories for England, Scotland, Wales and Northern Ireland: 1990 - 2007 AEAT/ENV/R/2873 Issue 1 report Sept.2009to DECC, WAG etc. www.airquality.co.uk/reports/cat07/0909231418_DA_GHGI_report_2007_maintext_Issue_1.pdf

CO2e means CO2 equivalent, which includes methane with a greenhouse factor 26

Figure: UK average CO2 emissions per kWh of electricity generated, 2006-2050

Committee on Climate Change, Building a low-carbon economy – the UK’s contribution to tackling climate change - The First Report of the Committee on Climate Change. 2008.