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32 votes
3 answers
3k views

Which solar power technology has the highest energy return on investment (EROI aka EROEI)?

15 votes
4 answers
248 views

How can I decarbonise my domestic heating, given severe physical constraints?

15 votes
3 answers
4k views

What's the average efficiency of pumped hydroelectric energy storage facilities?

14 votes
6 answers
5k views

What is the relationship between energy efficiency and sustainability?

13 votes
3 answers
14k views

What is the relationship between recycling and sustainability?

12 votes
2 answers
338 views

How do I keep my solar panels clean?

10 votes
1 answer
118 views

How do the criteria for 'best' building insulation change depending on context?

9 votes
2 answers
150 views

How can electricity grids successfully incorporate high (50%+) penetrations of PV and wind?

8 votes
2 answers
10k views

What is the relationship between biodiversity and sustainability?

8 votes
2 answers
260 views

What have been the economic factors behind the build of tracking PV systems?

8 votes
5 answers
471 views

Best options for decarbonising steel production?

8 votes
3 answers
456 views

Optimising crop yields without using fossil-fuel-manufactured fertiliser

7 votes
1 answer
4k views

What is the IPAT identity, and does it still matter?

7 votes
2 answers
1k views

What are the physical limits on wind turbine size?

7 votes
1 answer
98 views

What scope is there for price reductions in photovoltaic inverter costs?

7 votes
2 answers
113 views

Curbing non-exhaust (non-tailpipe) transport emissions of particulates

7 votes
1 answer
71 views

How are readings from the wind sensors mounted on wind turbines influenced by the blades' wakes?

7 votes
3 answers
14k views

How can I monitor a PV system's performance?

7 votes
1 answer
143 views

Most promising decarbonisation routes for clinker, cement and concrete?

6 votes
1 answer
1k views

How long does it take to construct a new port suitable for offshore wind construction?

6 votes
1 answer
78 views

How quickly can the offshore-turbine supply chain expand?

6 votes
1 answer
87 views

How far had Iceland gone by 2012 in decarbonising its energy system?

6 votes
1 answer
197 views

Where are the world's wave resources, beyond the UK and Portugal?

6 votes
1 answer
153 views

documented research on best practice for encouraging behaviour change towards more sustainable transport?

6 votes
2 answers
292 views

Is it possible to carry out large-scale seaweed cultivation for biomass / biofuel production?

6 votes
1 answer
188 views

MVHR no longer the ventilation of choice in some Nordic countries?

5 votes
1 answer
35 views

How accurate are consultant pre-construction energy assessments?

5 votes
1 answer
90 views

What metrics are usually used to quantify forecasted power error for weather-dependent renewables?

5 votes
0 answers
187 views

What are the advantages and disadvantages of using lidars over sodars for wind resource assessment?

5 votes
1 answer
105 views

Is there a recent study that shows how accurate wind turbine wake models are?