All parties are promising to reduce energy demand in buildings. The standard improvements are surprisingly limited (cavity wall insulation saves 7%, loft insulation saves 4%) and 2/3 of the properties are done already. Major improvement requires rebuilding. But at our current rate of demolition/conversion, it takes 22 years to replace 1% of the housing stock.

How credible are the parties' plans for mass tree-planting in the UK? The numbers sound big, but what does "big" really look like in forestry terms? What are the costs and impacts?

With UK parties competing to promise the earth, XR pushing eco-socialism, and hugely uneven national decarbonisation efforts, it's time to resurrect C4CS.

The decline of coal-fired electricity highlights important challenges for a network relying more heavily on intermittent generation.

Electricity prices in the UK are not the result of profiteering on the supply of electricity. A price cap will be counterproductive, driving smaller players out of the market and increasing the dominance of big players.

The increasing use of batteries to provide system services to our electricity network does not imply that the same technology is practical to smooth seasonal imbalances between demand for heat and intermittent generation.

Dong won the contracts for 3 offshore-wind projects in Germany, at prices they claimed to be "subsidy-free". But are they really "subsidy-free"?

Why did the European Commission withhold the national Renewable Energy Progress Reports when it published its biennial EU Progress Report in Feb 2017?

A report from the Offshore Renewable Energy Catapult (OREC) notes that the value to the economy of offshore wind is less than the subsidy, but claims this will reverse. We question this.

Eurostat is a fantastic resource for energy data. We consider, for example, their interactive map of renewable energy delivery over time by country.

The costs of the support mechanisms for renewable electricity are rising inexorably. From £0.5bn in 2011/12, the UK's environmental levies are now expected to hit £13.6bn in 2021/22.

Efforts to encourage renewable electricity and renewable transport do not have much effect on the overall levels of renewable energy. It is the levels of renewable heat that most strongly influence the overall delivery of renewable energy.