Solar Power

Trade and Industry written question – answered on 7th June 2007.

Alert me about debates like this

Photo of Gregory Barker Gregory Barker Shadow Spokesperson (Environment, Food and Rural Affairs)

To ask the Secretary of State for Trade and Industry what the Government's estimate is of the lifetime carbon saving from (a) a 2.5kWp domestic solar photovoltaics system and (b) a 4m2 domestic solar hot water system.

Photo of Malcolm Wicks Malcolm Wicks Minister of State (Science and Innovation), Department of Trade and Industry

As part of the EEC3 (Energy Efficiency Commitment) programme, the carbon savings for domestic solar PV and solar hot water systems have been calculated using the carbon factor from the DEFRA 'Guidelines for Greenhouse Gas Reporting':

http://www.defra.gov.uk/environment/business/envrp/gas/envrpgas-annexes.pdf

Taking this into account, for a lifetime of 25 years, a typical domestic PV installation would save 6.21 tC.

The energy savings of solar thermal panels depend upon the water heating system displaced. The following table lists the values assumed for a 4m2 domestic hot water installation in the EEC3 Illustrative Mix:

http://www.defra.gov.uk/corporate/consult/eec3-2007/letter.htm

Energy saved per year (kWh) Annual carbon saving (kgC/yr) Lifetime carbon saving( tC) Lifetime CO 2 saving tC0 2 Comments
Gas CH 1,577 81.7 2.04 7.49
Electric storage heating 1,240 145.7 3.64 13.36
Oil central heating 1,500 102.0 2.55 9.35
Solid fuel central heating 2,050 167.5 4.19 15.35
Gas non-CH 1,230 145.0 3.63 13.29 Water is heated by electricity
Electric non-CH 1,230 145.0 3.63 13.29 Water is heated by electricity
Solid fuel non-CH 1,230 145.0 3.63 13.29 Water is heated by electricity
Weighted average over all heating types 1,548 88.9 2.22 8.15

Does this answer the above question?

Yes1 person thinks so

No0 people think not

Would you like to ask a question like this yourself? Use our Freedom of Information site.