According to Liu Ye's understanding, there are no more than three ways to build power plants: thermal power, water conservancy and nuclear power generation.

Thermal power generation has always accounted for about half of Huaxia's power generation and is the main mode of power generation, followed by hydropower generation, and nuclear power generation is the least.

But at present, it seems that none of these three power generation methods are suitable for the current metropolis.

Thermal power generation requires a large number of coal mines to consume, and the utilization rate is actually very low, only about 35%, and it is highly polluting. At present, the supply of coal mines, the capital itself is very tight, and there are no surplus coal mines to provide power generation.

Hydropower generation is also difficult in advance, the terrain of China in a hundred years after the war, because of the war has changed a lot, many places Liu Ye now recognizes. Moreover, the establishment of hydroelectric power plants is a big project, and there must be a certain power base.

At present, Liu Ye can be said to be poor and white, so he doesn't want to think about hydropower generation.

As for nuclear power generation, Liu Ye doesn't want to think about it even more. He didn't want the nuclear power plant to be built yet, so he blew up the capital first.

There are two other options that are most suitable for the metropolis right now, which are biogas power generation and wind power generation. The latter Liu Ye didn't need to think about it for the time being, he had already let Nan Tiancheng find a suitable place a few days ago. However, it is more dangerous there, and wind power generation is also a bit complicated, so you must have the appropriate equipment.

In other words, the most suitable way to generate electricity is biogas.

The population of the metropolis is currently about 4,600 people, which is already a megacity in the wasteland. However, such a population base in pre-war China was only equivalent to three small villages, one and a half medium villages, or one large village.

In the past, a medium-sized village in northern China could generate about 350,000 kilowatt hours of electricity a year using biogas. Of course, this takes into account the village's straw and livestock manure, and if these are excluded, then the electricity generated by a medium-sized village may have to be discounted in half and subtracted by a third.

But even so, a rough estimate is that there is at least 100,000 kilowatts of power generation, which is roughly enough to support the basic operation of the steel plant and the use of the citizens of the metropolis.

In addition, Liu Ye has also cultivated a lot of farmland outside the capital, and if he makes good use of it, he can generate about 50,000 kilowatts of electricity.

In other words, as long as a sound management method can be established, it is not impossible to use biogas to supply electricity to the metropolis.

However, there is currently an important hurdle to be overcome in the use of biogas for power generation, and Liu Ye currently lacks corresponding biogas generator sets.

It is not practical to go to Bailu City to obtain biogas to generate electricity, after all, it is difficult to save the fire from far water. It is even more impossible to make a 'trade' with the Pure Land City, which is tantamount to seeking skin with a tiger.

There are also some discarded generator sets in the steel plant, but those electromechanical power is very high, and it takes a long time to retrofit.

The only thing that can be done now is to convert the medium-sized diesel generators on hand to biogas to generate electricity to meet the demand temporarily. However, the medium-sized generator is not powerful enough to generate electricity from a maximum of five digesters.

As a rough calculation, if it is running at full power, it will provide 300 kilowatts of power per day. To be honest, this kind of electricity is a drop in the bucket, but fortunately, there are not many places in the capital that need electricity, and the gluttonous battleship has its own energy system, and the biogas digester only needs to supply the steel plant.

It took two days to renovate the generators, another three days to build the digester to generate electricity, plus the first two days, and a week to the time to set off from Liemeng and Nantiancheng.

Siege Liu Ye naturally still had to follow, he 'handed over' the stalks, and they collected all the manure of the people in the city to make biogas power generation according to their own prior arrangement. He handed them a few drawings and asked them to follow the drawings above and step up casting in their free time.

Of course, the merchants who collected that batch of steel in advance did not make any less money, and Liu Ye still gave them enough materials. But this time, he also warned them that if anything like this happened to 'disturb' the order of the capital, all their merchant licenses would be revoked.

After everything was 'handed over', Liu Ye took Lie 'Meng' and Nantian Cheng Haohao 'dang' and 'dang' towards Haiwei City.

The wasteland of early spring is the time of frequent activity of mutated organisms, and often at this time, few people dare to rush on the wasteland.

But this situation is naturally not a difficult thing for Liu Ye, everyone around them is not weak, and there are phantom wolves and black wind bears to follow, and it is naturally very easy to go all the way.

The 500-kilometer journey was completed in one day with the mobility of the Lie 'Meng', and soon the city outline of the city of Haiwei was seen.

The city of Haiwei also occupies a special position in the wilderness, as one of the few cities that can provide table salt, its important 'nature' is self-evident. However, the city of Haiwei is very low-key, and they do not use their monopoly position to seek hegemony in the wasteland, but on the contrary, they do their best to provide salt for each city.

However, this situation began to change three years ago. Haiwei City has changed the low price of salt in the past and raised the price aggressively. Many city lords were very dissatisfied in their hearts, but they dared not speak out, who let their throats be stuck in other people's hands.

Originally, with the financial resources of the capital, he didn't care about this, but Haiwei City seems to have reduced the proportion of salt in the capital since this year, and even cut off the supply in the end. Coupled with the previous provocation of the capital, Liu Ye's anger was 'aroused', and he decided to directly capture Haiwei City, once and for all.

According to the intelligence of Dadu City and Tang Yueyue, although Haiwei City is very rich and its military strength is not bad, it is only slightly higher than Pure Land City. Compared to the current strength of the capital, it is still far behind.

Liu Ye knew that if the profound heritage of Haiwei City was brought into play, it would be even more difficult to deal with at that time. It is necessary to take the other side's financial resources by surprise when they have not yet been converted into military strength.

The blitzkrieg of Nazi Germany was undoubtedly more suitable for the current capital.

Haiwei City in the distance was quiet, Liu Ye stopped in a place where Haiwei City could not see, and ordered his subordinates to attack immediately after a short rest.

The city of Haiwei was built on the sea, which also made it easy for them to carry out salt production and salt drying processes. Because of its proximity to the sea, the walls of Haiwei City could not be built too high, otherwise the foundation would be tilted because the foundation was too shallow.

In order to compensate for this shortcoming, the city of Haiwei assumed a lot of "light" and heavy machine guns around the city walls to strengthen the defenses.

But such a formation has little effect in front of the Phantom Wolf Guard, especially Liu Ye is not only with the Phantom Wolf Guard.

"Lie 'Meng'! Attack! Liu Ye estimated the time, night is coming, this is the most suitable time for the capital to attack.

"Yes!" Lie Meng agreed without thinking, as if he did not see the strong defensive firepower of the city wall in front of him.

With a wave of his hand, Lie 'Meng' drove the motorcycle out first. The thieves next to him hesitated, and the pressure from behind them forced them to rush forward as well.

"You're on it too!" Liu Ye ordered towards Nantian Cheng Yinu.

"This ......" Nan Tiancheng hesitated, he could see the current situation clearly, if Lie Meng' rushed up like this, there was a chance that he would be beaten into slag by the garrison of the city wall.

Nan Tiancheng is not afraid of death, but he is also unwilling to send himself to others to be beaten.

"Don't go yet! Want to disobey orders? Liu Ye's eyes widened, and his previously gentle eyes were now extremely majestic.

"Yes!" was suppressed by Liu Ye's momentum, and Nan Tiancheng rushed up with his heart.

The smoke billowed ahead, illuminated by the setting sun, like a devil roaring with teeth and claws.

"Binlang, hide in those smoke and dust with your people, and I will give you a signal to attack!" Liu Ye ordered Bin Lang next to him to say.

"Yes!" Bin Lang, who admired Liu Ye very much, didn't say much, he led one hundred and twenty-five phantom wolf guards to rush out quickly, their bodies faded, and they hid in the billowing smoke of the Lie 'Meng' motorcycle team.

"Liu Ye, are you going to abandon Lie Meng' and the Blaster?" Feng Ruiyan asked in surprise when she saw Liu Ye's order.

In her opinion, Liu Ye's strategy is to use the Wind Rush to attract attention, and then use the Phantom Wolf Guard to launch a surprise attack.

"Abandonment? How could I abandon my own people! Liu Ye 'revealed' a meaningful smile to Feng Ruiyan, and issued an order to attack the black bear guard next to him.

The Black Bear Guard howled, slapping the Black Wind Bear under his seat like a gust of wind.

"Then why did you arrange it that way? Don't you know that the whirlwind is simply not suitable for such a frontal assault? It is good at mobile warfare and 'rioting'! Feng Ruiyan said with some 'excitement' that she already regarded herself as a part of the capital, or rather regarded the capital city as her own.

Therefore, Liu Ye's behavior is equivalent to 'wasting' the resources of the capital, which really makes her angry. If it weren't for Liu Ye's face, Feng Ruiyan would have slapped him and asked him to change his instructions.

"Don't be in a hurry! Ruiyan! You'll have to figure out how long the Storm has been in our capital! And what did their predecessors do! Their experience has determined that only a special method can be used to completely subdue them! Liu Ye shook his head with a smile and patted Feng Ruiyan's shoulder with a comforting tone.