Avedore CHP plant in Denmark

Remember how we said last month that industrial combined heat and power (CHP) plants could save us money, increase our energy security and help slow climate change?

Well, we've just heard that plans are afoot for just such a plant in Scotland. The Tullis Russell paper mill plans to reduce its annual carbon emissions by around 250,000 tonnes a year by switching to biomass CHP for its electricity and steam.

"You have to act quickly, because very soon these fields will be dry." This prediction, drawled by hardened oilman Daniel Plainview in this year's best film, There Will Be Blood, has become a reality. Eight years into the 21st century and we are seeing the beginnings of a new energy horizon. Oil is receding into the distance. Nature's "free gift" to humanity is running out, fast.

2008 will come to be seen as the year the world's leaders were forced to confront their demons. The global response to stratospheric oil prices will determine if we are able to escape the worst consequences of climate change, feed the world and prevent pollution from ruining living conditions in our ever expanding cities. Trillions of dollars will be spent in the next few decades on technologies to generate energy, as old infrastructure rusts and economies expand in parts of the world that have endured poverty for centuries.

Alex Steffen of Worldchanging recently wrote an excellent piece called Who Will Tell the People? And How? about the yawning chasm between the reality of climate change and the failure of government to bring in the massive changes needed. Talking about US emissions cuts, he writes:

We're running into a situation here where the acceptable political action is to move from A to C, but where realism demands that - if we want to dodge a catastrophic collision with ecological reality - we move from A to say Q. And that gap, between C and Q, is large enough to lose a future in.

As you're reading this blog, you probably don't need reminding about the catastrophic collision with ecological reality Steffen mentions. With stakes this high, the changes needed (Steffen's A to Q) are profound, fundamental and cross all facets of human existence - from our energy and transport systems to, dare I say it, our social and economic systems.

The ROCA 3 CHP plant in Rotterdam provides electricty and heat to 400,000 homes

Due to popular demand (well, demand anyway), The Weekly Geek now has its very own RSS feed.

Back in 1882, Thomas Edison built the United States' first electric power plant. Pearl Street Station, which supplied the good folks of Lower Manhattan with electricity for lighting and steam for manufacturing, was around 50 per cent efficient.

125 years on, the typical UK power plant is just 38 per cent efficient. But those modern power plants that have been built on the same principles as Edison's are reaching efficiency levels of up to 95 per cent.

So how did Edison do it? And where are we going so wrong?

In this week's slightly tardy Weekly Geek, we're looking at combined heat and power (CHP): the system Edison was using, and the heart of any truly clean and efficient decentralised energy system. (Those who read the first Weekly Geek on decentralised energy may notice a fair bit of crossover.)

It's Weekly Geek time, and this week we're looking at micro-hydro power: a truly reliable, highly efficient, and extremely clean (it has no direct carbon emissions) way of generating electricity.

It needs no fuel but offers a constant supply of electricity which often increases in winter, along with demand. It has a long life cycle (typically 25 years or more). It can have low implementation and maintenance costs. And, unlike some large scale hydroelectric power schemes, it has minimal environmental and visual impacts.

Ken Livingstone wants it for London, Hilary Benn is giving money to it and Adam and Debbie are bringing it to Ambridge. After a couple of millennia in the sidelines, anaerobic digestion has finally hit the big time (well, The Archers, anyway) - which is why we've chosen it for this second edition of the Weekly Geek.

Every year, we bury thousands of tonnes of waste food in landfill sites around the UK. We produce almost one and a half million tonnes of sewage a year (don't do the maths - it's disturbing), which is mostly spread on land, incinerated or buried as landfill. And we produce enormous amounts of agricultural waste on our farms. All of this waste breaks down to release greenhouse gases as it decomposes.

The Olympic Energy Centre

The Olympic Delivery Authority has long said it wants the London Olympic games in 2012 "to be the first sustainable Games".

Well, today it's unveiled a design for its energy centre - complete with a combined cooling, heat and power (CCHP) plant fuelled by sustainable biomass (woodchip) and natural gas.

This combined heat and power plant in Denmark is up to 95 per cent efficient

To celebrate our launch of EfficienCity, we're starting a new, weekly column for all the closet energy geeks out there. Every week, we'll take an in-depth look at one of the technologies we feature in EfficienCity - tidal power, wave power, wind energy, combined heat and power, micro-hydro power, anaerobic digestion, biomass and the rest. We'll also be looking at issues like baseload and the regulatory context for decentralised energy.

So remember to check back each Wednesday and, if you have any suggestions for energy solutions to climate change you'd like to see us cover, just post a comment at the bottom of this page and we'll try to slot it in.