LAST WEEK The Herald looked at the energy market and the ways in which different parties have approached the question of rising domestic energy bills.

That article discussed the ways in which taking advantage of existing energy efficiency schemes and the use of the most competitive tariffs would reduce bills far more than a simple price cut on the most commonly used domestic tariff.

Labour has claimed it will create over 300,000 renewable energy jobs throughout the country and put modern low-carbon industries at the heart of a £500 billion investment strategy, championing ‘a new green industrial revolution’.

One of the big ideas underpinning that commitment is to promote the growth of local energy companies and support the development of 1,000 community energy co-operatives. That’s accompanied by a commitment to 65% renewable electricity by 2030, aiming for 85% as technology improves and diffuses.

All of which will sound very familiar to Plaid Cymru, whose Shadow Environment spokesperson, Simon Thomas AM, has called for the creation of Ynni Cymru to promote Wales’ own self-sufficiency in domestic energy. It sounds like Plaid’s clothes have been lifted by Jeremy Corbyn’s promises to invest in similar schemes and raise investment across the UK.

Labour has set out a radical commitment to set up publicly-owned energy supply companies in every region focused purely on cutting prices. Under the same proposals, Government would take ‘control of the natural monopolies of the transmission and distribution grids’ currently run by the National Grid.

The Labour leader has made big promises, and the cynical might think that Labour may as well shoot for The Moon, given the remote chances it has of forming an administration under Jeremy Corbyn as PM.

“We’ve got a real opportunity to drive the green economy – to have green jobs, green growth, and make sure that we have our share of the industries of the future. Clearly there’s the climate change agenda, where we’ve got to get back on track, both nationally and internationally. And third, there is the issue of energy security, which I think is vitally important, which we need to do a huge amount of work on.”

Those were big promises, too. They were made seven years ago by David Cameron at the outset of his first term as PM, when he pledged to lead the greenest government ever. By 2013, David Cameron was keen to ‘get rid of all the green crap’, as the hopes of 2010 smashed into the economic and political realities of Treasury austerity.

The rug was pulled from under the renewables industry: following through on the pledge to virtually ban onshore wind, and slashing the feed in tariff. Overall UK carbon emissions had been falling but the growth in renewables deployment stalled, and solar companies employing thousands of people around the country went bust.

Five years later, at the outset of his second term, David Cameron pulled the Green Deal for UK homes.

On every single one of those policy decisions, commitments, and staggering reversals Theresa May went along, bobbing along like a cork on the tide of Cabinet collective responsibility. The number of times she has spoken out on energy policy in public can be counted on the fingers of one thumb. However, she merged the Department of Energy and Climate Change into a new Department of Business, Energy and Industrial Strategy in July 2016.

While that suggests a rather less overtly ‘green’ approach to the PR side of politics than her predecessor, it is noteworthy that Theresa May has expressed consistent and strong positions on the issue of energy security. Her first noteworthy public policy decision was to initiate a pause on the development of Hinkley B, ostensibly due to concerns of increasing UK reliance on Chinese investment in its energy infrastructure.

In addition, in a complex and volatile international energy market, there are clear attractions for the PM in adopting measure which enhance energy security and the reduction on the reliance of overseas energy. Her concerns on energy supply were echoed in the 2015 Conservative manifesto, which said: ‘Without secure energy supplies, our country becomes less safe and less prosperous’.

And, in 2008, Mrs May said: “I am thrilled to see that after years of Conservative pressure, we have finally passed a necessary and ambitious piece of legislation on Climate Change. Britain is the first country in the world to formally bind itself to cut greenhouse emissions and I strongly believe this will improve our national and economic security.

“To stay reliant on fossil fuels would mean tying ourselves to increasingly unstable supplies which could endanger our energy security and the Climate Change and Energy Bills mark an important step for both the health of our economy and the health of our nation. It is now vital that we stick to these targets.”

The logic of Mrs May’s evident and consistently expressed concerns on security of energy supply is to make the UK more self-sufficient. There are two sides to that issues: firstly, the extension of green energy generation; secondly, the extension of fracking and nuclear power.

The second limb of that proposition is the most contentious. Fracking is a public relations disaster waiting to happen and the first time it is scheduled to take place in a Conservative-held marginal seat is when we will see just how committed the Conservative party is to its use. As for nuclear power, it requires considerable public support and subsidy to make it even marginally viable for the long term.

The only large energy project requiring anything like the level of price support as nuclear power is the Swansea Tidal Lagoon, which for all its carbon-saving claims involves quarrying stone in Cornwall, building new jetties extending into the Bristol Channel and transporting the stone over by barge to Swansea by the thousands of tonnes to build a tidal barrage affecting marine life and habitats across the whole of Swansea Bay.

For someone as sensitive to polls as Theresa May it is worth noting that the BEIS tracker surveys on consumer views shows significantly higher support for renewable energy (at around 75-80%) than for other options. Opposition to renewables was very low at 4%, with only 1% strongly opposed.

However, and this is where energy policies and political judgement come into play, support for renewables was lower amongst those in social grade DE (72%), aged 65+ (73%), and social renters (75%).

The first two of those groups are key electoral demographics whose support Theresa May is actively courting. The triangulation of Conservative policy on energy, which now appears to have abandoned the notion that competition delivers the best results for energy users, might not swing a lot of votes, but the Conservative leader will not be shy of using every gimmick in her arsenal to court wavering voters looking for a way to justify voting Conservative.